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Suitability of Using Crushed Concrete Adjacent to Geotextiles in Underdrain Systems Second Phase: Field Trial Before Implementation
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2025-02-01
[PDF-5.75 MB]
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Edition:Final Contract
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Abstract:Due to the increasing interest in the use of recycled concrete as a base course aggregate, the Virginia Department of Transportation (VDOT) identified the need for an in-depth research investigate the clogging potential of the geotextile used in highway edge drains if crushed hydraulic cement concrete (CHCC) is placed adjacent to the drainage fabric geotextile. To answer the research needs of the VDOT and address the discrepancies in the existing literature, George Mason University conducted a laboratory-based study and published their findings (VTRC 21-R12). The study identified two major mechanisms through which CHCC reduces the flowability of the geotextile used in underdrains: physical (fine particles migrating onto the voids in between the filaments of the geotextile) and chemical (precipitation of chemicals within geotextile filaments) phenomena. The findings showed that although the drainage fabric geotextile experienced some level of reduction in its flow capacity, as was expected, the reduction was not significant enough to impact and impede the overall flow of the geotextile/CHCC system. However, the laboratory study had some limitations, e.g., while simulating the physical and chemical phenomena simultaneously, temperature, rain, and humidity variations during seasonal changes were not accounted for, the potential effects of the pavement over the top of CHCC were not included, and drainage pipes were not considered. The research reported herein is the second phase of the laboratory study and involved constructing a full-scale field test site within VDOT’s Harrisonburg facility.
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