EVALUATION OF COMPACTION OF CEMENT TREATED BASES

A persistent small percentage of California's portland cement concrete (PCC) pavements develop a faulting condition. This results in decreased riding quality and, in the extreme case, structural failure. Generally, California's PCC pavements are constructed over cement treated aggregate bases (CTB), which are suspected of abrading and contributing to faulting. Trimming to grade of the CTB during placement is believed to contribute to a loss in its surface integrity. During this investigation twenty-one CTB test sections were studied to evaluate the surface characteristics of both conventionally placed (trimmed) and experimentally placed CTB using a 'no-trim' method. The field investigations indicated that CTB can be placed using a 'no-trim' method and meet the specifications imposed for conventionally placed CTB. The laboratory investigation of samples removed from the test sections did not indicate a significant advantage for either placement method due to variables within the CTB itself. It is recommended that changes be made in construction methods to eliminate the trimming operation from all forms of CTB construction.

Media Info

  • Pagination: 26 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00094138
  • Record Type: Publication
  • Source Agency: National Technical Information Service
  • Report/Paper Numbers: CA-DOTL-3382-1-7512 Final Rpt., FHWA/RD-76-S0437
  • Files: NTIS, TRIS, USDOT, STATEDOT
  • Created Date: Mar 29 1976 12:00AM