1D Infiltration Behavior of Two-Layered Recycled Concrete Aggregates Using Hydrophobic Materials in a Column Apparatus
Publication: Journal of Materials in Civil Engineering
Volume 29, Issue 8
Abstract
The infiltration characteristics of two different hydrophobic materials were investigated in this study. The materials used in this study were fine and coarse recycled concrete aggregates (RCA). One-dimensional (1D) vertical infiltration column tests were carried out on fine RCA over coarse RCA, fine RCA over coarse RCA with oil, and fine RCA over coarse RCA with wax. The column apparatus were instrumented with a tensiometer-transducer system, data acquisition system, soil moisture sensor, and electronic weighing balance. The comprehensive instruments were used to measure pore-water pressure, water content, and outflow rate of water instantaneously and automatically. The experimental results indicated that the water flowed faster within the layer of coarse RCA with oil and wax as compared to that within the layer of coarse RCA without oil and wax. This could be attributed to the hydrophobicity of each solid particle of coarse RCA that was coated with oil and wax.
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Acknowledgments
The findings published in this paper are based on the project “GeoBarrier System for Use in Underground Structure” (Grant No. SUL2013-3) that is supported by a research grant from the Ministry of National Development Research Fund on Sustainable Urban Living, Singapore and the works were carried out and completed in collaboration between NTU and the HDB.
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©2017 American Society of Civil Engineers.
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Received: Jun 17, 2016
Accepted: Nov 2, 2016
Published online: Mar 30, 2017
Published in print: Aug 1, 2017
Discussion open until: Aug 30, 2017
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