Effect of Low-Quality Recycled Concrete Aggregate on Stabilized Clay Properties
Publication: Journal of Materials in Civil Engineering
Volume 32, Issue 8
Abstract
Recycled concrete aggregate (RCA) is the result of the demolition of concrete structures and pavements. Using RCA to replace quarried aggregates in paving projects is one way to utilize the millions of tons of concrete waste that is produced annually and landfilled. However, RCA may have inferior physical properties when compared to virgin aggregates, such as the presence of recycled mortar and preexisting deficiencies. This study evaluated the potential use of RCA from D-cracked pavement for soil stabilization. D-cracking is a type of pavement deterioration that originates in the coarse aggregate particles due to freezing and thawing. The engineering properties of low-plasticity clay with RCA and three common regional stabilizers (i.e., lime, Class C fly ash, and a combination of portland cement and fly ash) were investigated. Clay mixtures with varying proportions of chemical stabilizers and RCA from D-cracked pavements were evaluated by comparing measured unconfined compressive strength, linear shrinkage, and the California bearing ratio. Laboratory test results indicated that RCA, in conjunction with all cementitious materials, except lime, improved clay strength, stiffness, and shrinkage properties. The results from this study highlight that RCA from D-cracked pavements can be used for clay subgrade stabilization.
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Data Availability Statement
Some or all data, models, or code that support the findings of this study are available from the corresponding author upon reasonable request (results from unconfined compressive strength tests, shrinkage tests, CBR tests, EDX, XRF, and SEM images).
Acknowledgments
The authors would like to acknowledge the Kansas Department of Transportation for sponsoring this study.
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Published In
Journal of Materials in Civil Engineering
Volume 32 • Issue 8 • August 2020
Copyright
©2020 American Society of Civil Engineers.
History
Received: Apr 30, 2019
Accepted: Jan 9, 2020
Published online: May 21, 2020
Published in print: Aug 1, 2020
Discussion open until: Oct 21, 2020
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