Special Issue Paper
(Received 21 February 2014; accepted 20 October 2014)
Published Online: 14 March 2015
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Recycled concrete aggregate (RCA) is often used as a replacement for virgin aggregate in road foundations (base course), embankments, hot-mix asphalt, and Portland cement concrete. However, the use of RCA in exfiltration drainage systems, such as French drains, is still uncommon. The primary concerns with using RCA as drainage media are excessive fines and calcite precipitation that can cause a reduction in permeability performance. This study investigates the potential benefits of RCA as drainage material. This paper presents and discusses: (1) the results of a nationwide survey on current practices and policies, (2) physical and chemical properties, (3) effective fine-removing methods, (4) re-cementation potential, (4) permeability (under varied fine content), and (5) long-term drainage performance of RCA as drainage material. Test results indicate that RCA No. 4 gradation does not restrict the flow of water, but the RCA fines being generated during aggregate handling process (e.g., stockpiling, placing and transporting) may cause clogging buildup over time.
Nam, Boo Hyun
Assistant Professor, Department of Civil, Environmental, and Construction Engineering, Univ. of Central Florida, Orlando, FL
Behring, Zachary R.
Structural Designer, Florida Department of Transportation, District 4, 3400 West Commercial Blvd., Ft. Lauderdale, FL
Postdoctoral Researcher, Center for Advanced Infrastructure and Transportation (CAIT), Rutgers, Piscataway, NJ
Associate Professor, Department of Civil, Environmental, and Construction Engineering, University of Central Florida, Orlando, FL
Geotechnical Engineer, Florida Department of Transportation State Material Office, Gainsville, FL
Senior Researcher, Geotechnical Engineering Research Division, Korea Institute of Civil Engineering and Building Technology, Gyeonggi-Do,
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