Mechanical Properties of Recycled Concrete Aggregate and Recycled Asphalt Pavement Reinforced with Geosynthetics

Mechanical properties of recycled concrete aggregate (RCA) and recycled asphalt pavement (RAP) were evaluated for use as backfill in mechanically stabilized earth (MSE) walls. Large scale triaxial compression tests, interface direct shear tests, and pull-out tests were conducted to evaluate interaction of RCA and RAP with geosynthetics. Consolidated drained triaxial tests under sustained axial stress were conducted to evaluate creep potential of compacted RAP. Results show the compacted RCA and RAP samples tested herein have internal friction angles (ϕ´) of 47o and 29o respectively which are within the typical range of ϕ´ reported in the literature. Both RAP and RCA exhibited a higher interface friction angle (δ') with geogrids than with geotextiles. No slippage was observed between the RCA-geotextile and RCA-geogrid and the failures were due to rupture of the geotextiles and geogrids during the pullout test. RCA has higher interaction coefficient (Ci) with geosynthetics than RAP. The interaction coefficients for both RCA and RAP increase with normal stress. Results from creep tests showed that compacted RAP exhibits large deviator strains under sustained deviator stresses. Use of RAP and RCA in MSE walls are recommended if reinforced with geogrids only. To prevent creep failure of compacted RAP, maximum deviator stress in the backfill should be limited to 80% of compressive strength of compacted RAP.

Language

  • English

Media Info

  • Media Type: Web
  • Pagination: pp 284-292
  • Monograph Title: Geo-Congress 2019: Earth Retaining Structures and Geosynthetics

Subject/Index Terms

Filing Info

  • Accession Number: 01715692
  • Record Type: Publication
  • ISBN: 9780784482087
  • Files: TRIS, ASCE
  • Created Date: Mar 21 2019 3:02PM