Utilization of Recycled Concrete Aggregate (RCA) in French Drain System: A Full-Scale Study

The utilization of recycled concrete aggregate (RCA) as a backfill material in an exfiltration drainage system such as French drain has been studied in a laboratory-scale over the past decade. In previous studies, the reduction of filter fabric permittivity can be caused by the total amount of RCA fine contents, the accumulation of calcite precipitation and the hydration of anhydrous cement grains. Laboratory-based tests are necessary to characterize RCA as a drainage material and determine the variables which affect and cause the clogging potential of a drainage system. The laboratory-based tests, however, have limitations compared to the full-scale test as well as tests under the actual field conditions. Therefore, it is necessary and sufficient to setup in-situ/full-scale experiments which can simulate 3-D flow in a drainage system and short- and long-term performances. French drainage system, a common drainage system in the United State, which consists of RCAs as backfill material, has been built in a field as a comparison of a French drain system with natural aggregates (Limestone). Each RCA French drain system contains a different percentage of RCA fines (0, 2 and 4%). The design and construction of French drain system with RCA are described. Flow rate and discharge rate of groundwater have been monitored to evaluate the short- and long-term performances of RCA French drain system. The results of flow rate and discharge rate show that RCA French drain performs similar if not better than limestone. In addition, the performance of French drain systems is highly dependent on the geological condition (e.g. in-situ soil); however, excessive fines can cause large reductions in flow rate over time.

  • Supplemental Notes:
    • This paper was sponsored by TRB committee AFS60 Standing Committee on Subsurface Drainage.
  • Corporate Authors:

    Transportation Research Board

    ,    
  • Authors:
    • An, Jinwoo
    • Perez, Adam Lane
    • Shoucair, John
    • Nam, Boo Hyun
  • Conference:
  • Date: 2019

Language

  • English

Media Info

  • Media Type: Digital/other
  • Features: Figures; References; Tables;
  • Pagination: 7p

Subject/Index Terms

Filing Info

  • Accession Number: 01698389
  • Record Type: Publication
  • Report/Paper Numbers: 19-05874
  • Files: TRIS, TRB, ATRI
  • Created Date: Dec 7 2018 9:30AM