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Geomechanics and Engineering Volume 33, Number 1, April10 2023 , pages 065-75 DOI: https://doi.org/10.12989/gae.2023.33.1.065 |
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Effect of reaction temperature and time on the formation of calcite precipitation of recycled concrete aggregate (RCA) for drainage applications |
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Boo Hyun Nam, Jinwoo An and Toni Curate
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| Abstract | ||
| Recycled concrete aggregate (RCA) is widely used as a construction material in road construction, concrete structures, embankments, etc. However, it has been reported that calcite (CaCO3) precipitation from RCA can be a cause of clogging when used in drainage applications. An accelerated calcite precipitation (ACP) procedure has been devised to evaluate the long-term geochemical performance of RCA in subsurface drainage systems. While the ACP procedure was useful for the French Drain application, there remained opportunities for improvement. In this study, key factors that control the formation of calcite precipitation were quantitatively evaluated, and the results were used to improve the current prototype ACP method. A laboratory parametric study was carried out by investigating the effects of reaction temperature and time on the formation of calcite precipitation of RCA, with determining an optimum reaction temperature and time which maximizes calcite precipitation. The improved ACP procedure was then applied to RCA samples that were graded for Type I Underdrain application, to compare the calcite precipitation. Two key findings are (1) that calcite precipitation can be maximized with the optimum heating temperature (75C) and time (17 hours), and (2) the potential for calcite precipitation from RCA is not as significant as for limestone. With the improved ACP procedure, the total amount of calcite precipitation from RCAs within the life cycle of a drain system can be determined when RCAs from different sources are used as pipe backfill materials in a drain system. | ||
| Key Words | ||
| calcite precipitation; clogging; french drain; recycled concrete aggregate (RCA) | ||
| Address | ||
| Boo Hyun Nam: Department of Civil Engineering, Kyung Hee University, Republic of Korea Jinwoo An: School of Engineering, University of Mount Union, Alliance, Ohio, U.S.A. Toni Curate: Department of Civil, Environmental, and Construction Engineering, University of Central Florida, Orlando, Florida, U.S.A. | ||