The short signifier of the Construction Quality Assessment System is CONQUAS, it was introduced by Building and Construction Authority ( BCA ) . The aim of debut of CONQUAS is for the public and private building industry sector to mensurate the standard quality of plants done of building undertaking. ( The National House Buyers Association ( HBA ) , 2009 ) .
The Building and Construction Authority ( BCA ) is developed by the Singapore authorities, this bureau is classified under Singapore ‘s Ministry of National Development. The BCA have good consequences in the building industry in Singapore which it is awarded as the title-holder for the first-class built environment in Singapore development. All of the substructures, constructions and edifices in our milieus that provide the scene for the community ‘s activities are considered as the “ Built environment ” ( Building and Construction Authority, 2006 )
Since 1989, the CONQUAS have been launched and it is merely implemented by the Singapore local building field at the beginning ( Building and Construction Authority, 2006 ) .
Presents, Malaysia, Singapore, Hong Kong, China, Australia, Hong Kong, South Africa, India and United Kingdom building field have started to implement the CONQUAS appraisal system in their building undertaking. The CONQUAS system is widely adopted in the international building industry due to the CONQUAS system is widely recognized and accepted as the benchmarking tool for quality internationally. Now, CONQUAS is regoznized as registered hallmark ( Building and Construction Authority, 2006 ) .
The chief aim of CONQUAS is measuring the quality of building plants to guarantee the quality of the undertaking fulfill the quality criterion. Besides, it besides enable the appraisal of quality can be carried out within sensible cost and clip consistently. Furthermore, the constructed plants will assessed by the CONQUAS sing the craft criterions quality and specifications ( Building and Construction Industry, 2005 ) .
Furthermore, CONQUAS is considered as an independent appraisal. All of the CONQUAS appraisal can be merely assessed by the BCA Singapore officer, means merely the officer of BCA Singapore can go the assessor. The CONQUAS are utilizing the sampling system as their appraisal system. Sampling system mean that merely few samples will be indiscriminately chosen by the assessor for review to stand for the quality of whole undertaking, non every unit will be assessed ( The National House Buyers Association ( HBA ) , 2009 ) .
There are transcending 2,238 private and public building undertakings have been inspected by BCA after the CONQUAS have been introduced since 1989. The analysis stated that cost of more than 81.9billion Singapore dollar is the entire cumulative contract value of the assessed undertakings ( Building and Construction Authority, 2006 ) .
In this recent old ages, building filed in Malaysia start to follow CONQUAS 21 appraisal system into the building undertakings.
Problem Statement
Harmonizing to constructing merchandise, quality is a of import issue that ever concerned by house purchasers, investors, contractor and developer. All of the qualities of edifice merchandises are depend on how the contractors or developers construct it and how they control the quality direction. Every house buyer hope the edifice that they purchase achieved the standard quality. There is ever a inquiry from most of the house purchasers, how can they guarantee the quality of the edifice merchandise is tally with the sum money they have paid? Is at that place anything can warrant it?
The contractor can implement the Construction Quality Assessment ( CONQUAS 21 ) into the edifice undertaking to guarantee the quality of the constructed work and to present a good quality merchandise to the house buyer. How do the CONQUAS appraisal systems map to keep the standard quality of constructed work? This is besides the reply that the house buyers wish to cognize to hold more confident on the CONQUAS appraisal system. Besides, what is the advantage brought to contractor, developer and house purchaser by using CONQUAS 21 appraisal system. Alternatively, what is the job will be occurred while using it? So, the research worker will look into the reply for above inquiry by making research on application of CONQUAS 21 appraisal system in the building industry.
Aims & A ; Aims
Purposes
To look into Quality Assessment System ( CONQUAS 21 ) in building industry.
Aims
To analyze the rule and construct of CONQUAS 21
To happen out jobs occur when using the CONQUAS 21
To happen out the advantages of utilizing CONQUAS 21
Scope of survey
The diary documents, conference documents, books and shoping through web sites is the secondary beginning that the information and inside informations to be obtained from for the research worker to supply the information sing the CONQUAS 21 process system and the criterion of CONQUAS 21.
Besides that, the nonsubjective research worker is investigate the factor encourage most of the local developers and contractor to utilize the CONQUAS 21 as the appraisal system for their undertaking in the building field. Furthermore, the research worker besides will calculate out the advantage and the disadvantages of CONQUAS 21. There are more inside informations will be investigate sing to following of CONQUAS 21.
Research Methodologies
Literature Research
Cover diaries, relevant text edition, and internet research and conference paper is the beginnings that I obtain my information and making for my literature research.
Interview
Site agent, supervisor and the site director will be interviewed by the researched to acquire more inside informations about the CONQUAS 21. The research worker will travel to Swiss Garden Residences site to carry on the interview.
Case Study
Case survey will be carried by site visit to the Swiss Garden Residence to happen out the advantage of CONQUAS 21. Furthermore, another purpose of site visit is to happen out the jobs occur when using the CONQUAS 21.
Chapter Outline
Chapter 1: Introduction
The background of CONQUAS will be introduced by the research worker. Furthermore, the research worker indicates more inside informations about the aims and purpose of this research to be carried out.
Chapter 2: Literature Reappraisal
The construct and rule of CONQUAS 21 will be reviewed in more inside informations by the research worker. The research worker searches the secondary beginning such as books, articles, diaries and web site to acquire more inside informations about the CONQUAS 21. Besides, the research worker indicates the advantages and disadvantages of implementing of CONQUAS 21.
Chapter 3: Planing the instance survey and research methodological analysis
An interview will be conducted by the research worker at Swiss Garden Residences for the more inside informations about CONQUAS 21. The undertaking director, site director and site agent will be interviewed for obtaining the relevant information.
Chapter 4: Analysis of the secondary informations
The research worker is traveling to make analysis on the information collected and give some sentiment based on the information obtained sing the CONQUAS 21.
Chapter 5: Decision and farther surveies
In chapter 5, the farther surveies for quality appraisal will be stated out by the research worker and decision will be indicated by the research worker.
Chapter 2
Literature Review
2.1 Quality Philosophy
Definition of Quality
Different party defines the quality in different manner. Some people will specify it as to run into contract demands, alternatively some people define it as the satisfaction of client and others besides define as it reaches the needed criterions. ‘The amount of the features of an entity, its ability to run into the demands of the express or implied committedness to ‘ is the definition that The National Organization for Standardization ( ISO ) defines quality ( Chung, 1999 ) . The purposes or demands have been fulfilled or reached by any party ; mean the quality criterion has been achieved.
Furthermore, quality besides can be defined based on ain sentiment such as ‘providing clients with merchandises and services that systematically meet their demands and outlooks ‘ ( S.L. Tang, 2005 ) , ‘performance to the criterion expected by the client ‘ ( S.L. Tang, 2005 ) and ‘fitness for intent ‘ ( Chung, 1999 ) .
However, the definiton of quality is based on how a party to specify, it can be defined is several manner.
Basic Concept of Quality
Quality is the most of import factor to be concerned in every field including building field. In order to accomplish the quality, the industries have come out with there are assessment system and guidelines to be carried out to guarantee the plants done in the building industry can accomplish the quality. ISO 9001:2000, Quality Assessment System in Construction ( QLASSIC ) and Construction Quality Assessment ( CONQUAS ) is the appraisal system that ever used by constrction industry to guarantee the plants done reach the quality standard demand. Case survey of CONQUAS will be carried out in more inside informations later.
Quality can be quantified as follows: –
Q=P/E
Where,
Q = quality
P = public presentation
E = outlook
If Q is greater than 1.0, so the client has a good feeling about the merchandises or services ( Besterfield, 1998 ) .
Furthermore, There are nine dimensions in the quality. All dimensions are independent, which means that an terminal merchandise can be first-class in one dimension but hapless in others ( Besterfield, 1998 ) . These nine dimensions inside informations and their footings is the followers: –
Table 1: Nine dimensions of quality and their footings
Dimension
Footings
Performances
Primary products/service characteristic such as clip, cost and craft facet.
Features
Secondary feature, added consideration such as creativeness in design and attractivenes.
Conformity
Meeting specification or industry criterions, craft and client ‘s demand in contract.
Dependability
Consistency of public presentation over clip, mean clip for the unit to neglect.
Lastingness
Useful life period with less care or fix.
Service
Resolution of jobs and ailments, easiness of fix.
Response
Human to human interface such as efficiency during meeting, fast determination devising, effectual human resources direction.
Aestheticss
Centripetal features in design such as exterior coatings.
Reputaion
Past public presentation such as being ranked foremost in the tendering procedure.
Adapted from Garvin, 1988, Pull offing Quality: The strategic and Competitive Edge, New York: Free Press.
( Garvin, 1988 )
Furthermore, there are ever the relationship between quality with cost, value, rhythm clip and productiveness. The inside informations of the relationship is shown as followers: –
Quality and Productivity
Productivity addition will act upon the quality by betterment
Productivity = Salcable end product / Resources used
Quality and Costss
Cost will increase if the quality of conformity addition
Cost will increase if the quality of design addition
Quality and Cycle Time
The rhythm clip will be cut down if there is betterment of quality attempt
The rhythm clip to finish the activities is the cardinal parametric quantity
Quality and Value
Organizations must evalute the value they provide, comparative to the competition
Value = Quality / Price
( S.L. Tang, 2005 )
2.1.3 Quality Management
Quality direction will act upon the quality straight. The rules of quality direction are applicable to every industry, within all administrations and at every degree ( McCabe, 1988 ) . The basic end of quality direction is the riddance of failure: both in the construct and world of merchandises, services and procedures ( Juran, 1989 ) .
The quality direction is defined as “ all activities of the overall direction map that determine the quality policy, aims and duties, and implement them by agencies such as quality planning, quality control, quality confidence, and quality betterment within the quality system ” ( McCabe, 1988 )
The quality direction have four phases in development, known as: Quality Inspection, Quality Control ( QC ) , Quality Assurance ( QA ) and Entire Quality Management ( TQM ) ( UTM, 2003 ) . Inspection and Quality Control are retrospective ; their purpose is find out the occurred job by sensing manner. Alternatively, the purpose of Quality Assurance and Total Quality Management is cut down and to avoid jobs happening ( McCabe, 1988 ) . The feature of the different phases in Quality Management as shown followers: –
Figure 1: The four phases of quality direction
TQM
QA
QC
Inspection
Adapted from Dale, Boaden and Lescelles 1994: Degrees of entire quality direction acceptance
( Dale, Boaden and Lescelles, 1994 )
Figure 2: The four phases of quality direction
Quality Assurance
Quality systems development
Advanced quality planning
Comprehensive quality manuals
Use of quality costs
Engagement of non-production operations
Failure manner
Entire Quality Management
Policy deployment
Involve providers and clients
Involve all operations
Process direction
Performance direction
Teamwork
Employee engagement
Quality Control
Develop quality manual
Procedure public presentation informations
Self-inspection
Merchandise proving
Basic quality planning
Use of basic statistics
Paperwork controls
Inspection
Salvage
Screening, rating, relending
Corrective actions
Identify beginnings of non-conformance
Adapted from Steven McCabe 1988: Quality Improvement Techniques in Construction
( Steven McCabe, 1988 )
Phase 1: Inspection
The first phase of quality direction is review. The review is defined as “ Whether the activities implemented by each characteristic, such as metering, measuring, proving and review, the features of one or more entities, and compare these consequences with the prescribed demands in order to set up ” ( McCabe, 1988 ) .
Inspection is used by most of the building industry to guarantee the conformity. The site supervisor will carried out the review of the building undertaking. The supervisor will do the comparing the architectural plants and structural based on the specification and drawing. If there is any faulty plants found by the clients, the contractor demand to rectify the faulty plants until fulfill the client ‘s demand.
Phase 2: Quality Control ( QC )
Quality control will be carried out after the review done. Quality control is considered as a system of everyday proficient activities, to mensurate and command the quality of the stock list as it is being developed ( Mangino, 1996 ) .
The process of Quality control is really complicated. QC largely is based on the statistical analysis. Collection of informations is required in QC to keep the quality by statistical techniques.
Phase 3: Quality Assurance
Quality confidence is defined as “ implemented all planned activities within the quality system, and cogent evidence of the demand to supply equal assurance that an entity will run into the quality demands ” ( McCabe, 1988 ) .
The aim of Quality Assurance ( QA ) is to supply equal assurance that a service or merchandise will carry through clients ‘ demand by executing system audit, Failure Mode and Effect Analysis, design of experiment and similar enterprises ( UTM, 2003 ) . In other words, QA is more specified on planning. The bar of hapless quality and defects is based on sensing activities.
Phase 4: Entire Quality Management
The concluding phase of quality direction is Entire Quality Management. The execution and apprehension of quality direction rules and constructs in every facet of concern activities are involved in this phase. The best service or merchandise will be provided to the client at the lower cost by utilizing these activities.
However, TQM is less formal ; holding either processs or system, and it is difficult to be described due to it is less in formality ( McCabe, 1988 ) . Normally, merely counsel will be provided by TQM and it consider as a doctrine.
Concept and Principles of CONQUAS 21
2.2.1 Introduction
Recently, the demand of clients towards the edifice that they purchase is quality. They wish to acquire the best quality of the purchase edifice as possible. In this status, the developers have to play an of import function to guarantee the quality of the edifice undertaking. The developers overcome the job by utilizing Quality Assurance ( QA ) and Quality Control ( QC ) into the building undertaking to keep the criterion of quality as the demand. CONQUAS 21, ISO 9001:2000, QLASSIC will go the pick for the developers for their appraisal system. Case survey about CONQUAS 21 will be carried out by the research worker in more inside informations.
2.2.2 Aims of CONQUAS 21
There are three aims in the CONQUAS 21 system:
Act as a standard quality appraisal system in building undertakings.
Inspecting quality appraisal by:
Measuring the specification and criterion of the craft in the plants done
Randomly choosing the sample as represent the whole undertaking
To enable quality appraisal consistently take topographic point within sensible cost and clip
( Building and Construction Authority ( BCA ) , 2006 )
Scope of CONQUAS 21
In CONQUAS 21 system, all the plants done will be given points based on the quality criterion. All of the given points will be added together to acquire the entire quality mark which besides known as CONQUAS mark for the building undertaking ( Building and Construction Authority ( BCA ) , 2006 ) . The quality craft is better, the higher of CONQUAS mark will be obtained. 100 % is the maximal CONQUAS mark in building undertaking, but our human being is unable to build a work with zero-defects.
The general edifice plant is covered by CONQUAS 21 system. There are 3 constituents in the appraisal:
Structural Plants
Architectural Works and
Mechanical & A ; Electrical ( M & A ; E ) Works
There are different point to be assessed in the different constituent stated above ( Building and Construction Authority, 2005 ) .
CONQUAS 21 is considered as ‘first clip right ‘ review attack ( Building and Construction Authority, 2005 ) means that the rectification plants will non take into consideration in CONQUAS 21 mark for the appraisal. Furthermore, trying system is the appraisal system used in the CONQUAS. The assessor will take the unit harmonizing to the norm, 1-in-4 flat units in a residential development for the appraisal ( Building and Construction Authority, 2005 ) . Thus, which unit will be chosen is unknown so the contractors have to guarantee all of the constructed plants are in good quality status. If there is any faulty found, the plants will be considered as failed.
Besides, the to a great extent equipment-base such as heavy foundation, sub-structure plants and stacking is non available for appraisal and the work separate contracts or sub-contracts are non included in the appraisal ( Building and Construction Authority ( BCA ) , 2006 ) .
The review is different with the review done by the site supervisor. Normally, the contractors have to intentionally make an agreement for the review which form a specific squad for the review. There is a guideline have to be followed for the appraisal.
Components to be assessed
Structural Works, Architectural Works and M & A ; E Works are the constituents under CONQUAS 21 appraisal.
Structural Plants
Structural Works can be considered as ‘body ‘ for a edifice, the stableness of the edifice will be affected if there is failure or defect in structural plants. Therefore, keep its quality is necessary due to the cost of rectification is really expensive. Below show the inside informations of the appraisal of Structural Works: –
Inspection of finished concrete, formwork and steel support have to be carried out on site during the building site. If any constituent constitutes exceed 20 % of the entire structural cost, the pre-stressed concrete and structural steel are included in the appraisal. If found the precast concrete volume more than 20 % of structural concrete volume, the precast elements have to be assessed.
Tensile strength of steel support and testing of compressive strength of concrete will be carried out on research lab testing.
Non-destructive testing of the uniformity and the screen of hard-boiled concrete.
( Building and Construction Authority ( BCA ) , 2006 )
Appendix 1 shows the quality criterions of Structural Works.
Architectural Works
The constituents and coatings are classified in Architectural Works. The craft and quality can be easy seen and found. Below are the inside informations of appraisal of Architectural Works: –
After the edifice have complete, the appraisals have to be carried out on roofs, external plants, external walls and internal coatings. All the appraisals have to be carried out on site. Internal walls, doors, constituents, Windowss and floors are classified under the internal coatings.
Functional and material trials such as on adhesion of internal wall tiles, water-tightness of window and external walls
( Building and Construction Authority ( BCA ) , 2006 )
Appendix 2 shows Architectural Works quality criterion.
Mechanical & A ; Electrical ( M & A ; E ) Works
The advancement of whole edifice will be influenced by M & A ; E Works. Air conditioning & A ; Mechanical Ventilation Works ( ACMV ) , Electrical works, the footing M & A ; E adjustments and Fire Protection Works are classified under the advancement of the edifice. Below are the phases of appraisal: –
Concealed pipes, ACMV ductworks and electrical conduits are classified as installed plants, the review on the point have to be carried out before embedded on site.
The chilling tower, fire dismay control panel and Air-Handling Unit ( AHU ) are the concluding installed plants which the appraisals have to be carried out on site.
Dry Riser Test, Earthing Test and Water Pressure Test are considered as selected plants. The public presentation trials are carried out on them.
( Building and Construction Authority ( BCA ) , 2006 )
Appendix 3 show the choice criterion of M & A ; E Works.
The Weightages
Cat A ( Commercial, Industrial, Institution and Others ) , CAT B ( Condominium, Institution and Others ) , CAT C ( Public lodging ) , and CAT D ( Landed belongingss ) are the four classs of edifice that distribute the weightages for M & A ; E Works, Architectural Works and Structural Works in CONQUAS 21 system.
The aim of weightage system is doing the quality of a edifice is based on the CONQUAS tonss. In general, M & A ; E works consist 10 % for four classs of edifice in norm, 35 % is consisted by the Structural plants and the highest per centum is consisted by Architectural plants which 50 % in norm for the four classs of edifices. The quality of Architect works is the most of import with the highest per centum, second is represented by the Structural plants and M & A ; E works is the lowest.
Table 2: The Weightages in CONQUAS 21
Components
CAT A Commercial, Industrial, Institution & A ; Others
CAT B Commercial, Industrial, Institution & A ; Others
CAT C Public Housing
CAT D Landed Properties
Structural Plants
30 %
35 %
45 %
40 %
Architectural Works
50 %
55 %
50 %
55 %
M & A ; E Works
20 %
10 %
5 %
5 %
CONQUAS Mark
100 %
100 %
100 %
100 %
Adapted from Building and Construction Authority ( BCA ) : CONQUAS 21 manual book
( Building and Construction Authority, 2006 )
CONQUAS Assessor
In CONQUAS 21 system, merely the Building and Construction Authority ( BCA ) officer can be the assessor to inspect the plants done of the undertaking. BCA will carry on a standardization plan and preparation for assessors to go to to guarantee competence and consistence in the appraisal ( Building and Construction Authority, 2006 ) .
Furthermore, CONQUAS 21 system is consider as independent appraisal. Therefore, the designers and applied scientists are non allowed to utilize CONQUAS to do any determination unless the edifice contract stipulate it ( Building and Construction Authority ( BCA ) , 2006 ) .
Sampling
Sampling system is introduced in the CONQUAS 21 system for the appraisal. It is impossible for us to inspect every unit of the plants done. Therefore, the sampling system is used for the appraisal, it helps the accessor a batch by salvaging the clip and do the appraisal easier due to the samples will be indiscriminately chosen by the assessor for review to stand for the quality of whole undertaking, non every unit will be assessed.
Furthermore, the trying system want to do certain the review is sufficient to stand for the whole edifice by mentioning to the gross floor country of the edifice.
The appraisal of CONQUAS 21
Assessment attack
Sampling system is used by the CONQUAS 21 as the appraisal system, the sample will be indiscriminately selected for the quality appraisal harmonizing to the location program and drawing program and it will be distributed based on the building phases ( Building and Construction Authority ( BCA ) , 2006 ) .
Furthermore, “ making things right the first clip ” is the rule of the CONQUAS 21 system which want to do certain all the contractor do the plants good and keep the quality in first clip. Therefore, the marking will non take into history for the rectification works, merely the first clip works done will be inspected and scored in the CONQUAS 21 system ( Building and Construction Authority ( BCA ) , 2006 ) .
In make fulling the appraisal signifier, “ Ten ” intend the work done do non carry through the CONQUAS quality criterion after review on it. Alternatively, “ ” see the inspected work have reached the quality criterion stated in the CONQUAS system. Besides, non applicable point will be noted as “ – ” in the assessment signifier. The figure of “ ” over the entire figure of point assessed is the concluding mark of CONQUAS for the whole undertaking.
Structural plants appraisal
After the whole undertakings have been completed, the review on structural plants merely can be done. Wall, slab, beam and column can be classified as the Structural plants. Below show the inside informations of the appraisal of a strengthened concrete construction: –
Table 3: The appraisal of a strengthened concrete construction
Reinforced Concrete Structure
Weightage %
Formwork
15
Rebar
20
Finished Concrete
25
Concrete Quality
5
Steel Reinforcement Quality
5
NDT – UPV trial for concrete uniformity
15
NDT – Electro-Cover metre trial for concrete screen
15
Entire
100
*If entire precast concrete volume exceeds 20 % of entire structural concrete volume, appraisal will be carried out for precast concrete building. The points will be distributed proportionally between formwork/rebar appraisal and precast concrete appraisal based on the several concrete volume per centum.
Adapted from Building and Construction Authority: CONQUAS 21 manual book
( Building and Construction Authority, 2006 )
The structural plants appraisal is carried out by utilizing trying system which mean merely portion of the samples have been chosen to stand for whole undertaking for the appraisal, non every unit is inspected. Therefore, there are some guidelines for the appraisal of structural plants. The guidelines are shown as below: –
Table 4: Guidelines for Structural plants appraisal
Items
GFA per Sample
Min Sample
Max Sample
Remarks
1
Structural Elementss
500 M2
30
150
For Non-Housing Project
1a
Strctural Elementss
1500 M2
30
50
For Housing Project
2
Concrete Compressive Strength
–
100 %
–
Declaration by Qualified Person
3
Steel support Tensile Strength
–
100 %
–
Declaration by Qualified Person
4
NDT – UPV trial for concrete uniformity
5,000 M2
2 sets
20 sets
5 construction members per set
5
NDT – Electro-Cover metre trial for concrete screen
5,000 M2
2 sets
20 sets
5 construction members per set
Adapted from Building and Construction Authority: CONQUAS 21 manual book
( Building and Construction Authority, 2006 )
The review is merely site review, the review can non be done at precast pace due to all the construction works to be inspected is cast unmoved concrete plants, non the precast constituent. The review of the structural plant is harmonizing to conformity to the criterions ( see in the Appendix 1, 1a, 1b & A ; 1c ) .
The farther appraisal will be required if the structural steelwork in the structural plants exceed 20 % of the structural cost and the points will be distributed proportionally. The Pre-stressing Works is similar with the structural steelwork ( Building and Construction Authority ( BCA ) , 2006 ) .
Below table show how the points of pre-stressed concrete and structural steelwork are distributed: –
Table 5: Structural Steelwork
Structural Steelwork
Weightage %
Main member/Partially Assembled Component
40
Metallic element Decking
20
Erection Tolerances
10
Corrosion & A ; Fire Protection
10
Welding Test Reports
20
Entire
100
Note: Appraisal for structural steel roof truss is mandatory irregardless of the 20 % bing standards.
Adapted from Building and Construction Authority: CONQUAS 21 manual book
( Building and Construction Authority, 2006 )
Table 6: Pre-stressed Concrete
Pre-stressed Concrete
Weightage %
Tendon & A ; Anchorage
25
Sheathing
25
Stressing & A ; Grouting
25
Debonding
25
Entire
100
Adapted from Building and Construction Authority: CONQUAS 21 manual book
( Building and Construction Authority, 2006 )
Table 7: Choice of Samples for Structural Steelwork
Items
Steel tunnage per sample
Min Sample
Structural Elementss
Main member/Partially Assembled Component
250
5
Metallic element Decking
250
5
Erection Tolerances
500
5
Corrosion & A ; Fire Protection
500
5
Material & A ; Functional Test
Welding Test Reports ( NDT )
All critical welding articulations
Note: Samples will be taken earlier and after installing
Adapted from Building and Construction Authority: CONQUAS 21 manual book
( Building and Construction Authority, 2006 )
Architectural Works Assessment
After the edifice undertaking is completed, the review of Architectural plants will be taken topographic point to mensurate the quality of the plants done but with a status all of the appraisal have to be done before the contractor grip over the undertaking to the proprietor. Below show the inside informations of the appraisal of Architectural plants: –
Table 8: The Assessment of Architectural Works
Architectural Elementss
Weightage %
Entire
Breakdown
Internal Finishes
56
Floor
16
Internal wall
16
Ceiling
6
Door
6
Window
6
Component
6
Roof
4
4
External Wall
12
12
External Work
6
6
Material & A ; Functional Trials
22
Pre-packed Plaster
1
Field Window Water-Tightness Test ( WTT ) ( BCA Test 8 platinums + Self-Testing 2 platinums )
10
Wet Area Water-Tihtness Test ( BCA Test 4 platinums + Self-Testing 1 platinum )
5
Internal Wet Area Waterproofing Process
2
Pull-Off-Test for Internal Wall Tiles
4
Entire
100
Adapted from Building and Construction Authority: CONQUAS 21 manual book
( Building and Construction Authority, 2006 )
Architectural plants is utilizing trying system for appraisal excessively which is similar to the Structural plants, Architectural works have its ain guideline for the sampling. Different classs of edifice are varied in the guideline stated. Below are the guidelines of the sampling: –
Table 9: Guidelines for Architectural Works Assessment
Items
GFA per Sample
Min Sample
Max Sample
Remarks
1
Internal Finishes
500 M2
30
150
For Non-Housing Project
1a
Internal Finishes
70 M2
30
800
For all Private Housing Project
1b
Internal Finishes
70 M2
30
600
For Public Housing
2
External Wall
–
50 %
–
50 % of the blocks/units
3
External Work
–
1
–
1 for each type of external work
4
Pre-packed Plaster
–
–
–
Merely pre-packed plaster used. Declaration by Qualified Person
5a
Field Window Water-tightness Test ( WTT )
1,000 M2
20
100
Conducted by BCA
5b
Field Window Water-tightness Test ( WTT )
–
25 %
–
Self-Testing with declaration by Qualified Person
6a
Wet Area Water-tightness Test
–
20
100
10 % of all bathroom and/or lavatories ( by location )
All will be tested if & lt ; 20 nos
6b
Wet Area Water-tightness Test
–
100 %
–
Self-Testing with declaration by Qualified Person
Including level roof
7
Internal Wet Area Waterproofing Process
–
–
–
In-process appraisal based on sanctioned Method Statement
8
Pull-Off Test for Internal Wall Tiles
10,000 M2
1 Set
5 Sets
5 tiles per set ( by location )
Adapted from Building and Construction Authority: CONQUAS 21 manual book
( Building and Construction Authority, 2006 )
Hall, kitchen, lavatory, corridor, anteroom and room is considered as the functional infinite in the edifice. The appraisal of functional infinite of a edifice is classified as internal coatings appraisal. Below show types of locations: –
Service locations – public-service corporation countries such as lavatories, kitchens, balconies and paces
Principal location – major functional topographic points such as hall and suites
Circulation locations – include lift anterooms, corridors and stairwaies
( Building and Construction Authority ( BCA ) , 2006 )
There is different weightage for the different location. Appendix 4 show the defect group which influence the internal coatings hiting. The point which noted as failed mean the point do non carry through the quality criterion that CONQUAS 21 system require. If there is faulty plants found, the plants is indicated as failed in the review record such as grounds of H2O ooze in the window.
The appraisal for the external plants have to be done first before transporting out the assesssment for the external plant. There are some location will be divided during the external plant appraisal. Below show the location that contain in the appraisal of the external plants: –
Link-way/Shelter – 10m length subdivision per sample and minimal 2 samples
Apron & A ; Drain – 10m length subdivision per sample and minimal 2 samples
Roadwork & A ; Carpark – 10m length subdivision per sample and minimal 1 sample
Footpaths & A ; Turfing – 10m length subdivision per sample and minimal 2 samples
Playground – 1 location
Court – 1 location
Fencing & A ; Gate – 10m length subdivision per sample and minimal 1 sample
Swiming Pool – 10m length subdivision per sample and minimal 1 sample
Club House – 1 location
Guard House – 1 location
Electrical Substaion – 1 location
( Building and Construction Authority ( BCA ) , 2006 )
Every point will be inspected individually in the appraisal of the External plants. Those points that are non available for the edifice undertaking, it will non be taken into history during marking.
M & A ; E Works Assessment
The M & A ; E appraisal is non similar as Architectural plants and Structural works appraisal. In the M & A ; E works appraisal, the appraisal have been separate into two phases which is after the edifice have completed phase and during the building of structural plants phase. The classs of the undertakings distribute the weightage for M & A ; E works appraisal: –
Table 10: The Assessment of M & A ; E Works
M & A ; E Elementss
CATA
CAT B
CAT C
CAT D
M & A ; E Works Assessment
Electrical
15
15
10
10
ACMV
20
20
–
10
Fire Protection
10
10
10
–
Plumbing & A ; Sanitary
15
15
20
–
Basic Adjustments
15
15
20
–
Sub-total
75
75
100
100
Weightage
50 %
50 %
100 %
100 %
M & A ; E Performance Test Appraisal
Performance Testing
100
100
–
–
Weightage
50 %
50 %
–
–
Entire
100 %
100 %
100 %
100 %
Note 1: “ – ” means that no appraisal on that M & A ; E elements is required
Note 2: Please mention to Appendix 6 for inside informations of the points allocated under each component of the M & A ; E plants assessed
Adapted from Building and Construction Authority: CONQUAS 21 manual book
Furthermore, “ Get-It-Right-First-Time ” is the rule in CONQUAS 21 system, all the points stated in Table 10 above will be merely inspected for the first clip works done in the appraisal, all the rectification plants will non impact the marking in the appraisal. It means that the per centum of trials go throughing the first appraisal for each type of trial is the concluding mark of CONQUAS ( Building and Construction Authority ( BCA ) , 2006 ) .
Table 11: Marking method for “ Get-It-Right-First-Time ” rule
Ave % Passing at First Attempt
% of Performance Test Mark
80 % or below
0 %
80 % & lt ; X & lt ; 100 %
( X-80 ) /20 ten 100 %
100 %
100 %
Note: “ Ten ” means the mean per centum of go throughing at first effort
Adapted from Building and Construction Authority: CONQUAS 21 manual book
( Building and Construction Authority, 2006 )
Furthermore, M & A ; E works is besides utilizing trying system for their appraisal system. There is M & A ; E works trying guideline. The M & A ; E works trying guideline is different with others which there are four classs of edifice decide the M & A ; E trying plants. The guidelines are shown as followers:
Table 12: Guidelines for M & A ; E Works Assessment
Cat A 1,000 M2 per sample
CAT B 1,500 M2 per sample
CAT C 3,500 M2 per sample
CAT D 3,500 M2 per sample
Electrical
Embedded conduit
2+
2+
2+
Main overseas telegrams
1
1
Surface conduits
1+
1+
1+
1+
Cable tray, ladder & A ; trunking
1+
1+
1+
11
Distribution board
2+
2+
1
ACMV
Air managing unit
1+
Pump
1
Cooling tower
1
Hair-raiser
1
Organ pipe
1
Split unit/Window air conditioner
2+
2+
3+
Air-con comfort
1+
1+
2+
Ductwork
3+
1
Fire-rated canal
1
1
Dampers
1+
1
Fire Dampers
1
1
Flexible canals
2
Flexible connections
1
Fire Protection
Wet/dry riser
1+
1+
1+
Sprinkler
1+
1
Fire Alarm
1
1
Hosereel
1+
1+
1+
Plumbing & A ; Sanitary
Concealed pipes
1+
1+
Exposed pipes
4+
4+
4+
Water armored combat vehicle
1
1
1
Pump
1
1
1
Minimal Samples
35
25
10
10
Maximal Samples
70
50
20
20
Remarks: + means to be separated for extra samples required
Note: Basic M & A ; E Fittings – 500m2 per sample with min 30 and max 150 samples
Adapted from Building and Construction Authority: CONQUAS 21 manual book
( Building and Construction Authority, 2006 )
Calculation of CONQUAS Score
BCA have introduced the marking method for mensurating the quality of plants done in CONQUAS 21 system with few stairss, the stairss have to be followed while transporting out the hiting method. Below show the illustration of hiting method computed in CONQUAS 21 system which can establish in CONQUAS 21 manual book: –
Scenario:
Undertaking Type – Commercial ( CAT A )
Structural System – Reinforced Concrete system with 31 % precast concrete volume
and steel mills at 75 % to 25 % cost ratio
Roofing System – Flat Roof
Nos of Toilet – 10 nos
External Wall – Full Glass Curtain Wall
Measure 1: Calculation of Structural Score
The Structural Score will be proportioned by the cost ratio as follows:
Measure 2: Calculation of Architectural Score
Measure 3: Calculation of M & A ; E Score
Measure 4: Calculation of Final CONQUAS Score
Adapted from Building and Construction Authority: CONQUAS 21 manual book
( Building and Construction Authority, 2006 )
The Advantages of Implementing CONQUAS 21
Quality is the chief factor that to be concerned in a building undertaking. It is the nature of the building, the edifice value will be increase with the good quality building. The CIDB Singapore ‘s informations base show that the quality of the building undertaking improves with utilizing CONQUAS 21, which the building costs of public sector edifice are at least S $ 3 million. The CONQUAS mark rise from 67.9 to 74.3 in 8 old ages ( 1989-1997 ) ( Low, S.P. , Tan, B.K. and Allen, A.A.L. , 1999 ) .
The image of a house will be influenced by a good CONQUAS mark path record to guarantee future marketability. The figure of client will automatically increase with addition of the image of a house ( Building and Construction Authority, 2006 ) . All the employers want to do certain their merchandise can be delivered to the purchasers with good quality so they prefer to take the companies which have achieved good quality in the old undertakings. A good CONQUAS mark attract more people to put in the undertaking due to high quality undertaking. There is a one-year BCA Construction Excellence Award victors to be competed to win the award which selected by BCA based on the well CONQUAS public presentation. The image of the companies automatically increase if win the award ( Building and Construction Authority ( BCA ) , 2010 ) .
There is an inducement in the CONQUAS system attract the contractor to present the good quality edifice based on accomplishing good mark in the CONQUAS appraisal. For the undertaking which achieve the mark of above 75 points would acquire an inducements of entire RM 1,500,000.00 alternatively RM 1,000,000.00 merely will be given for the mark of above 65 points ( Building and Construction Authority, 2006 ) . This attractive inducement go a motive and promote for contractor to present a good quality edifice.
Besides, the CONQUAS system besides measures the quality of craft of the building. If found there is any unsatisfactory of the craft after mensurating in CONQUAS mark, the unsatisfactory of craft can be rectified before deliver to the buyer. Although the rectification can non increase the CONQUAS mark, but the better quality of merchandise can be delivered to purchaser to increase the satisfaction of the buyer and diminish the ailments from the buyer or cut down the rectification cost after vacant ownership ( The National House Buyers Association ( HBA ) , 2009 ) .
The Problems Occur When Applying CONQUAS 21
There are some disadvantages in the CONQUAS 21. It is hard to guarantee the public presentation of the company based on the CONQUAS 21 mark due to every undertaking is non similar in nature. The undertaking where utilize the precast constituents is executable such as level or school is easier to keep the quality direction comparison to the traditional dramatis personae in situ building because precast constituents are manufactured under controlled mill status, all the dimensions, sizes and forms are stated clearly. Therefore, the precast constituent is easier to be fixed on site. Alternatively, the contractor may confront the job while in the traditional cast-in-situ building which there is no specified size and dimension constituent provided, all have to project in situ, it is hard to command the quality of work. The building method will impact the CONQUAS mark.
CONQUAS 21 have its ain guideline sing the structural plants, architectural plants and M & A ; E work. For the individual in-charge for CONQUAS 21 review, have to follow the guideline province during the review. The review is different with the review done by the site supervisor. So the contractors have to intentionally make an agreement for this review which organic and specific squad under the review. In straight, with this excess review will protract the continuance of the undertaking.
Every appraisal will be charged for assessment cost. The cost CONQUAS 21 appraisal will be higher comparison to ISO 9001-2000 and QLASSIS, it will increase the building cost. Due to higher building cost, the merchandising monetary value will be increase in market ( The National House Buyers Association ( HBA ) , 2009 ) .
Furthermore, the mark can non wholly represent the quality of the edifice due to the mark is derived simply based on a random sample appraisal to stand for the whole building undertaking ( The National House Buyers Association ( HBA ) , 2009 ) . There might is any defect although the mark is high due to non whole units assessed by the CONQUAS system.
The Summary
In the recent old ages, there are a batch of developers in Malaysia building industry implementing CONQUAS as the quality appraisal for their edifice undertaking although the CIDB Malaysia has recommended QLASSIS. The CONQUAS can be considered as a new appraisal system in Malaysia building industry due to the quality appraisal system merely adopted by the building industry late although CONQUAS system was launched since 1989 in Singapore. The chief factor that the CONQUAS system will be adopted in the Malaysia building industry is the developers found CONQUAS system have more benefits compare to QLASSIS and ISO 9001:2000.
The CONQUAS system step the quality of the plants done in more inside informations and it is more beforehand comparison to other appraisal system that why most of developers prefer to implement CONQUAS 21 in their building undertaking.
