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Advances in Materials Science and Engineering
Volume 2013 (2013), Article ID 842929, 6 pages
Research Article

Mechanical Properties of Recycled Aggregate Concrete at Low and High Water/Binder Ratios

1Faculty of Civil Engineering, Beijing JiaoTong University, Beijing 100044, China
2BBMG Cement Energy Saving Technology Co., Ltd, Beijing 102403, China
3Beijing Building Materials Inspecting and Testing Center, Beijing 100041, China

Received 25 May 2013; Revised 19 September 2013; Accepted 12 October 2013

Academic Editor: S. Komarneni

Copyright © 2013 Gai-Fei Peng et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


This paper presents an experimental research on mechanical properties of recycled aggregate concrete (RAC) at low and high water/binder (W/B) ratios. Concrete at two W/B ratios (0.255 and 0.586) was broken into recycled concrete aggregates (RCA). A type of thermal treatment was employed to remove mortar attached to RCA. The RAC at a certain (low or high) W/B ratio was prepared with RCA made from demolished concrete of the same W/B ratio. Tests were conducted on aggregate to measure water absorption and crushing values and on both RAC and natural aggregate concrete (NAC) to measure compressive strength, tensile splitting strength, and fracture energy. The mechanical properties of RAC were lower than those of NAC at an identical mix proportion. Moreover, the heating process caused a decrease in compressive strength and fracture energy in the case of low W/B ratio but caused an increase in those properties in the case of high W/B ratio. The main type of flaw in RCA from concrete at a low W/B ratio should be microcracks in gravel, and the main type of flaw in RCA from concrete at a high W/B ratio should be attached mortar.