Compressive and Flexural Strength of Polyvinyl Alcohol–Modified Pavement Concrete Using Recycled Concrete Aggregates
Publication: Journal of Materials in Civil Engineering
Volume 30, Issue 4
Abstract
Research on the utilization of recycled concrete aggregate (RCA) in civil engineering applications is gaining popularity worldwide due to the increased efforts to promote preservation of the environment and sustainable development. Recycled concrete aggregate concrete is, however, presently still limited to nonstructural applications. Recycled concrete aggregate concrete can still be considered as a rigid pavement material when its flexural strength is improved adequately to sustain future traffic loads. In this study, polyvinyl alcohol (PVA), a water-soluble polymer, was used to improve the flexural strength of RCA concrete. The influence of PVA-to-cement () and water-to-cement () ratios on the compressive and flexural strengths of RCA-PVA concrete was investigated via scanning electron microscopy (SEM) and X-ray diffraction (XRD). Polyvinyl alcohol films were found to retard the hydration process, resulting in the delay in initial and final setting times of cement-PVA paste, therefore reducing the compressive strength of RCA-PVA concrete. For all the ratios tested, the flexural strength increased with increasing ratios up to an optimum ratio that provided the highest flexural strength, followed by a subsequent decrease beyond this peak value. The optimum ratio tended to increase with an increase in ratio, being 0.5, 0.5, 1.0, and 1.5 for ratios of 0.3, 0.4, 0.5, and 0.6, respectively. Based on the requirements of the Department of Highways, Thailand, the at was found to be suitable for developing RCA-PVA concrete for rigid pavements. The outcome of this research confirms the viability of using PVA to improve the flexural strength of RCA concrete for usage as a sustainable rigid pavement material.
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Acknowledgments
This work is financially supported by the Thailand Research Fund under the TRF Senior Research Scholar program Grant No. RTA5980005 and the Ph.D. Royal Jubilee program Grant No. 0143/2557 as well as Suranaree University of Technology.
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Published In
Journal of Materials in Civil Engineering
Volume 30 • Issue 4 • April 2018
Copyright
©2018 American Society of Civil Engineers.
History
Received: May 3, 2017
Accepted: Oct 9, 2017
Published online: Jan 31, 2018
Published in print: Apr 1, 2018
Discussion open until: Jun 30, 2018
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