Please use this identifier to cite or link to this item: https://scholarbank.nus.edu.sg/handle/10635/222341
Title: CARBON FOOTPRINT OF CONCRETE AGGREGATES
Authors: DO THI THUY QUYNH
Keywords: Building
Project and Facilities Management
Kua Harn Wei
2010/2011 PFM
Issue Date: 19-May-2011
Citation: DO THI THUY QUYNH (2011-05-19). CARBON FOOTPRINT OF CONCRETE AGGREGATES. ScholarBank@NUS Repository.
Abstract: Singapore’s growth and progress since independence has created a highly urbanized nation with a substantial build-up of building and infrastructure. Concrete is by far the most important building material not only in Singapore but worldwide. There are two problems arising from the popularity of concrete, which are over-mining of natural resources for aggregates and shortage of land for disposing construction and demolition (C&D) waste. Recycled concrete aggregate (RCA) from C&D waste has recently been used in Singapore as a new type of aggregate. Therefore, the broad aim of the study is to find out how sustainable is the use of RCA in concrete mixture and the environmental benefits of such replacement. The two objectives include evaluation of CO2 emission and electricity consumption of RCA and granite; and recommendation of aggregates usage to reduce CO2 emission and electricity consumption. The research method chosen in this study is Life Cycle Assessment (LCA). LCA is chosen because it is a “Cradle to Grave” approach to looking at environmental issues. A case study was conducted to collect data through in-depth face-to-face interviews with the selected building material supplier. The interviews were carried out with the guide of an interview questionnaire. The energy intensity for production and transportation of RCA as in the defined system boundary is approximately 0.0050 kg of CO2 and requires about 0.016212MJ of electricity for 1kg of RCA. This amount is lower than that of granite with equivalent functional unit, which is about 0.01022kg of CO2 and requires about 0.00022MJ of electricity. It is recommended that RCA should be used to replace part of granite in construction project to reduce carbon footprint of construction activities. Due to the unavailability of database and time constraints, the impact assessment of granite and RCA was not concluded in this study. Therefore, future research could help to investigate this area of interest.
URI: https://scholarbank.nus.edu.sg/handle/10635/222341
Appears in Collections:Bachelor's Theses

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