Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/34537
Title: Feasible use of recycled concrete aggregates and crushed clay brick as unbound road sub-base
Authors: Poon, CS 
Chan, D
Keywords: Construction and demolition waste
Recycled concrete aggregates
Crushed clay brick
Subbase
Issue Date: 2006
Publisher: Elsevier
Source: Construction and building materials, 2006, v. 20, no. 8, p. 578-585 How to cite?
Journal: Construction and building materials
Abstract: A study was recently conducted at the Hong Kong Polytechnic University to investigate the possibility of using recycled concrete aggregates and crushed clay brick as aggregates in unbound subbase materials. The results showed that the use of 100% recycled concrete aggregates increased the optimum moisture content and decreased the maximum dry density of the subbase materials compared to those of natural subbase materials. Moreover, the replacement of recycled concrete aggregates by crushed clay brick further increased the optimum moisture content and decreased the maximum dry density. This was mainly attributed to the lower particle density and higher water absorption of crushed clay brick compared to those of recycled concrete aggregates. The CBR values (unsoaked and soaked) of the subbase materials prepared with 100% recycled concrete aggregates were lower than those of natural subbase materials. The CBR values further decreased as the replacement level of recycled concrete aggregates by crushed clay brick increased. Nevertheless, the soaked CBR values for all recycled subbases were greater than 30%, which is a minimum strength requirement in Hong Kong. Furthermore, the recorded percentage swells for all subbases were less than 0.13% which can be considered negligible.
URI: http://hdl.handle.net/10397/34537
ISSN: 0950-0618
DOI: 10.1016/j.conbuildmat.2005.01.045
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