Reducing Construction Waste through Prefabrication during Design - - PowerPoint PPT Presentation

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Aug 21, 2022 127 likes •333 views

Reducing Construction Waste through Prefabrication during Design Stage: A Simulation Approach Reporter: Baoquan CHENG Supervisor: Jianli HAO 1 of 18 Outline Introductio 01 n Model Development 02 Results and Discussions 03 Conclusions

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Reducing Construction Waste through Prefabrication during Design Stage: A Simulation Approach

Reporter: Baoquan CHENG Supervisor: Jianli HAO

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Outline

Introductio n Model Development Results and Discussions Conclusions

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1

In t r o d u c t io n

 Background  Aim 3 of 18

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Increasing amount of construction waste

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Limited previous research

Background

Socio-economic and environmental benefjts of prefabrication methods The design stage can reduce construction waste from the source.

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Aim

Develop a model for assessing the potential of prefabrication on construction waste reduction using a system dynamics approach. 5 of 18

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Mo d e l D e ve l o p me n t

 Identify main variables  Causal-loop Diagram  Stock-fmow Diagram  Model verifjcation 6 of 18

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Identify Main Variables

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Causal-loop Diagram

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Stock-fmow Diagram

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Model Verifjcation: Extreme Condition Test

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Model Verifjcation: Extreme Condition Test

Scenarios S1(ARPC=5.4% ) S2(ARPC=25) S3(ARPC=50) S4(ARPC=75) Reduction( ton) rate Reductio n(ton) rate Reductio n(ton) rate Reductio n(ton) rate Concrete waste 0.27 6.1% 1.27 28.5% 2.55 57.3 % 3.84 86.3 % Brick and block waste 0.019 6.1% 0.089 28.5% 0.179 57.3 % 0.269 86.3 % Mortar waste 0.014 6.4% 0.067 30.4% 0.127 57.7 % 0.191 86.8 % Metal waste 0.029 6.1% 0.136 28.% 0.273 57.4 % 0.411 86.5 % Wood waste 0.049 6.1% 0.231 28.5% 0.464 57.3 % 0.699 86.3 % Rework waste 0.053 4.9% 0.245 22.6% 0.493 45.4 % 0.745 68.6 % Overall CW 12.04 22.6 % 55.74 104.7 % 111.4 209.2 % 167.4 341.3 % 11 of 18

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R e sul t s a n d Di sc ussi o ns

 Increase investment on professional training of designers  Policies strengthen 12 of 18

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Professional Training of Designers

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Policies Strengthen

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C o nc l us io n s

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03 02 01 An increase in the value of prefabricated components exerts a strong efgect on CW reduction especially for concrete waste during design stage 。 T wo strategies, increasing investment

n designers’ professional training and

strengthening policies, are effjcient in promotion of prefabrication method and increase CW reduction during design stage. Increasing the investment on designers’ professional training is not always useful as for the upper limit of designers‘ skills.

Conclusions

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THANKS FOR YOUR LISTENING!

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Q AND A

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