Evaluate the Use of Reclaimed Concrete Aggregate in French Drain Applications

Recycled concrete aggregate (RCA) is often used as a replacement of 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 uncommon. The primary concerns with using RCA as a drainage media are the fines content and the precipitation of calcium carbonate to cause a reducing in filter fabric (geotextile) permittivity. RCA was tested for its physical and chemical properties, and aggregate cleaning/washing methods were applied to evaluate the fines removal processes. The potential for RCA rehydration was evaluated by the use of compressive strength, pH, heat of hydration, and time of setting tests. Permeability testing on RCA was conducted under varied testing conditions, such as, percent fines addition, hydraulic gradient, and tubing and permeameter sizes. In addition, a long-term permeability was monitored to measure the clogging buildup due to RCA fines and calcite precipitation.

Language

  • English

Media Info

  • Media Type: Digital/other
  • Edition: Final Report
  • Features: Appendices; Figures; Photos; References; Tables;
  • Pagination: 106p

Subject/Index Terms

Filing Info

  • Accession Number: 01526328
  • Record Type: Publication
  • Contract Numbers: BDK 78 TWO 977-12
  • Files: TRIS, ATRI, USDOT, STATEDOT
  • Created Date: Apr 30 2014 3:12PM