Development of Processing Methods to Improve Strength of Concrete with 100% Recycled Coarse Aggregate
Publication: Journal of Materials in Civil Engineering
Volume 27, Issue 5
Abstract
Because of the increasing difficulty in obtaining natural aggregate, alternative aggregates have been considered in the construction industry. One of the feasible alternatives is to reuse construction and demolition waste as aggregates, called recycled aggregate, to make new concrete called recycled aggregate concrete (RAC). However, the compressive strength of RAC is usually poor due primarily to the high water absorption capacity, high porosity, and weaker bond of interfacial transition zone between recycled aggregate and new cement mortar. This paper presents the results of a comprehensive experimental study on RACs made of 100% recycled coarse aggregate. Three different mixing approaches, several surface pretreatment methods with two different pretreatment materials were used to improve the compressive strength of RAC. The experimental results showed that proper surface pretreatments and mixing approaches can improve the quality of RAC significantly. The water-cement ratio of pretreatment materials is very important. The compressive strength of an optimized RAC with 100% recycled coarse aggregate can reach as high as 43.3 MPa (6,277 psi) on 28 days.
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Acknowledgments
The authors wish to acknowledge the partial support by the U.S. National Science Foundation under grant CMMI-0900607 to University of Colorado at Boulder. Opinions expressed in this paper are those of the authors and do not necessarily reflect those of the sponsor.
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Published In
Journal of Materials in Civil Engineering
Volume 27 • Issue 5 • May 2015
Copyright
© 2014 American Society of Civil Engineers.
History
Received: Feb 3, 2013
Accepted: Jul 30, 2013
Published online: Aug 1, 2013
Discussion open until: Jan 5, 2015
Published in print: May 1, 2015
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