Modulus of Elasticity, Creep and Shrinkage of Concrete – PHASE II: Part 2– Low Modulus Concrete

This study evaluated the feasibility of use of Reclaimed Asphalt Pavement (RAP) and Recycled Concrete Aggregate (RCA) as aggregate in concrete when used in a typical concrete pavement in Florida. Concrete containing 0%, 10%, 20%, and 40% of RAP were evaluated for their properties that are relevant to performance of concrete pavements. The compressive strength, splitting tensile strength, flexural strength, and elastic modulus of the concrete decreased as the percentage of RAP increased. The coefficient of thermal expansion appeared to increase slightly when the first RAP was incorporated, and to decrease slightly when a second RAP was used. When a finite element analysis was performed to determine the maximum stresses in typical concrete pavements in Florida under critical temperature and load conditions, the resulting maximum stress to flexural strength ratio for the concrete was reduced as compared with that of a reference concrete with no RAP. This indicates that using a concrete containing RAP could possibly result in improvement in the performance of concrete pavements. Concrete containing 0%, 25%, and 50% of RCA were evaluated in a similar fashion. The compressive strength and elastic modulus decreased slightly as the percentage of RCA increased. The splitting tensile strength, flexural strength, and coefficient of thermal expansion were about the same for the control mix and the concrete containing RCA. When a similar analysis was performed to determine the maximum stresses in typical concrete pavements in Florida under critical temperature and load conditions, the maximum stresses to strength ratios in the pavement were found to be about the same for the control mix and concrete containing RCA. Thus, a concrete using RCA will likely have the same performance as a conventional concrete using virgin aggregates.

Language

  • English

Media Info

  • Media Type: CD-ROM
  • Edition: Final Report
  • Features: Appendices; Figures; References; Tables;
  • Pagination: 172p

Subject/Index Terms

Filing Info

  • Accession Number: 01145018
  • Record Type: Publication
  • Report/Paper Numbers: 00059678
  • Contract Numbers: BD-545 #67
  • Files: TRIS, STATEDOT
  • Created Date: Nov 19 2009 5:02PM