Evaluation of the use of recycled concrete aggregate in structural concrete

In response to the government’s call for sustainable construction, there is a need to divert the construction and demolition (C&D) waste away from the landfills and an urgency to source for alternative materials to replace natural aggregates, which are mainly imported from neighbouring countries...

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Main Author: Lim, Wee Fong
Other Authors: Ting Seng Kiong
Format: Theses and Dissertations
Language:English
Published: 2011
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Online Access:https://hdl.handle.net/10356/46446
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Institution: Nanyang Technological University
Language: English
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spelling sg-ntu-dr.10356-464462023-03-03T19:07:01Z Evaluation of the use of recycled concrete aggregate in structural concrete Lim, Wee Fong Ting Seng Kiong School of Civil and Environmental Engineering DRNTU::Engineering::Civil engineering::Construction technology In response to the government’s call for sustainable construction, there is a need to divert the construction and demolition (C&D) waste away from the landfills and an urgency to source for alternative materials to replace natural aggregates, which are mainly imported from neighbouring countries. One feasible solution is to produce structural concrete using recycled concrete aggregate (RCA) derived from C&D waste. Due to the fact that the characteristics of RCA are different from those of the natural coarse aggregate (NCA), the use of RCA in structural concrete has always been met with scepticism. This report describes a research study that carried out to investigate the feasibility of using a proposed rational concrete mix design method to overcome the barriers that restrict its use in structural concrete. First of all, laboratory tests were performed to determine the properties of RCA and the results were either used to compare with the corresponding properties of NCA or to check for their conformities with the specifications and standards. Tests were carried out to measure its geometrical, mechanical & physical, thermal & weathering properties and chemical composition. Due to the presence of attached mortar, RCA tends to lose out in the mechanical and physical properties but gain in shape index and surface texture. On the other hand, RCA is stable volumetrically and it can also be considered as an inert material in a concrete mix since it will not react readily with the other concrete components. Concrete mix designs were formulated for the full range of RCA contents (up to 100% replacement level) at different water-to-cement (W/C) ratios. A design slump of 125mm was used as the acceptance criteria for specimen preparation. For the same W/C ratio, the control mix (concrete mix with 0% RCA content) was used as a basis for comparison. The compressive strength test results illustrated that the use of RCA in low- and medium-strength concrete (between W/C ratio 0.67 and 0.35 respectively) has negligible effect on their performance. Conversely, there was an insignificant decrease in compressive strength with the increase in RCA content for high-strength concrete (W/C ratio < 0.45). MASTER OF ENGINEERING (CEE) 2011-12-06T03:22:49Z 2011-12-06T03:22:49Z 2011 2011 Thesis Lim, W. F. (2011). Evaluation of the use of recycled concrete aggregate in structural concrete. Master’s thesis, Nanyang Technological University, Singapore. https://hdl.handle.net/10356/46446 10.32657/10356/46446 en 215 p. application/pdf
institution Nanyang Technological University
building NTU Library
continent Asia
country Singapore
Singapore
content_provider NTU Library
collection DR-NTU
language English
topic DRNTU::Engineering::Civil engineering::Construction technology
spellingShingle DRNTU::Engineering::Civil engineering::Construction technology
Lim, Wee Fong
Evaluation of the use of recycled concrete aggregate in structural concrete
description In response to the government’s call for sustainable construction, there is a need to divert the construction and demolition (C&D) waste away from the landfills and an urgency to source for alternative materials to replace natural aggregates, which are mainly imported from neighbouring countries. One feasible solution is to produce structural concrete using recycled concrete aggregate (RCA) derived from C&D waste. Due to the fact that the characteristics of RCA are different from those of the natural coarse aggregate (NCA), the use of RCA in structural concrete has always been met with scepticism. This report describes a research study that carried out to investigate the feasibility of using a proposed rational concrete mix design method to overcome the barriers that restrict its use in structural concrete. First of all, laboratory tests were performed to determine the properties of RCA and the results were either used to compare with the corresponding properties of NCA or to check for their conformities with the specifications and standards. Tests were carried out to measure its geometrical, mechanical & physical, thermal & weathering properties and chemical composition. Due to the presence of attached mortar, RCA tends to lose out in the mechanical and physical properties but gain in shape index and surface texture. On the other hand, RCA is stable volumetrically and it can also be considered as an inert material in a concrete mix since it will not react readily with the other concrete components. Concrete mix designs were formulated for the full range of RCA contents (up to 100% replacement level) at different water-to-cement (W/C) ratios. A design slump of 125mm was used as the acceptance criteria for specimen preparation. For the same W/C ratio, the control mix (concrete mix with 0% RCA content) was used as a basis for comparison. The compressive strength test results illustrated that the use of RCA in low- and medium-strength concrete (between W/C ratio 0.67 and 0.35 respectively) has negligible effect on their performance. Conversely, there was an insignificant decrease in compressive strength with the increase in RCA content for high-strength concrete (W/C ratio < 0.45).
author2 Ting Seng Kiong
author_facet Ting Seng Kiong
Lim, Wee Fong
format Theses and Dissertations
author Lim, Wee Fong
author_sort Lim, Wee Fong
title Evaluation of the use of recycled concrete aggregate in structural concrete
title_short Evaluation of the use of recycled concrete aggregate in structural concrete
title_full Evaluation of the use of recycled concrete aggregate in structural concrete
title_fullStr Evaluation of the use of recycled concrete aggregate in structural concrete
title_full_unstemmed Evaluation of the use of recycled concrete aggregate in structural concrete
title_sort evaluation of the use of recycled concrete aggregate in structural concrete
publishDate 2011
url https://hdl.handle.net/10356/46446
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