CONTINUOUSLY REINFORCED CONCRETE OVERLAYS: 1975 CONDITION SURVEY

A condition survey of the continously reinforced concrete (CRC) projects in service in several states showed that with few exceptions, the performance (although short term) has been satisfactory. CRC surfacings (concrete surfacing that is placed without conventional transverse joints, other than construction joints, and contains longitudinal steel made continuous by lap splicing in such amounts as to maintain aggregate interlock at all random transverse cracks occurring within the resurfacing), generally 6 in. thick, have been built both as direct or partially bonded overlays and as unbonded overlays. A variation of this design is the elastic jointed CRC which makes use of regularly spaced unbonded lengths along the longitudianl reinforcement, with crack imitiators embedded in concrete below each bonded length. Twenty three projects in 11 states totalling 2,400,000 sq. yd. were surveyed. Their service lives ranged from 1 to 16 years. Reflection of joints and intermediate cracks were reported on projects which omitted a separation course. One project in Georgia on I-75 was rated excellent indicating that cracks that reflected from the base slab through the overlay have not affected the performance of the project. Projects with poor rating are discussed. The percentage of longitudinal steel in the projects ranged from 0.45 to 1.0. Fourteen of the projects were built with slipform pavers. Construction details are tabulated. The Average typical transverse crack spacing is 6 ft. The average minimum spacing is 2 ft., and the average maximum spacing is 10 ft.

Media Info

  • Features: Figures; Photos; Tables;
  • Pagination: 23 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00141256
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Oct 26 1976 12:00AM