Evaluation of restored pavement cuts using an accelerated pavement testing machine

An accelerated pavement loading machine (APLM) was used to apply repeated full-scale wheel loads on bellholes restored using various backfills, compaction efforts, and construction procedures in order to evaluate their performance in relation to the original roadway. The test sections were composed of a 6 inch (152 mm) asphalt concrete (A/C) layer and 10 inch (254 mm) stone-base layer on top of a silty-clay subgrade soil. Bellholes and trenches were cut, excavated, and restored in order to model typical utility-cut reinstatement procedures. Each bellhole was repaired differently to allow comparison of the variables. The backfills used in the bellholes were native soil, sand, stone, and flowable fill. The compaction efforts were controlled to obtain loose and dense backfill densities. Plastic pipes were installed in the test sections to simulate a real utility cut. The test sections were subjected to 9 kips (40 kN) repeated wheel loads from the Accelerated Pavement Loading Machine (APLM). The loading machine applied the wheel load at a speed of 6 mph (10 km/hr). The test sections were subjected to loading for up to 125,000 passes or until the rut depth reached one inch. Throughout loading, the surface deformation (rutting), pavement settlement, strains in the asphalt layer, earth pressure on the top of the backfill, and strains in the pipe were measured. The results showed that the effect of backfill type and traffic loads on the state of stresses at the level of the pipe was negligible. It also demonstrated significant variations of surface deformations due to the changes of backfill types and compaction efforts.


  • English

Media Info

  • Pagination: 26p
  • Monograph Title: Full scale accelerated pavement testing: a southern hemisphere and Asian perspective

Subject/Index Terms

Filing Info

  • Accession Number: 01389243
  • Record Type: Publication
  • Source Agency: ARRB
  • Files: ITRD, ATRI
  • Created Date: Aug 23 2012 3:16AM