01660216

Component

The joint performance of concrete slabs has a significant role on the development of faulting and corner cracks in conventional and unbonded concrete pavements and faulting, corner cracks and longitudinal cracks in bonded concrete overlays of asphalt pavements. The load transfer between the concrete slabs of undoweled joints or across cracks is realized through aggregate interlock, which largely depends on the crack width and crack surface texture. However, the concrete mixture plays an important role in the available aggregate interlock but is not currently characterized during the mixture design phase. The cost and time necessary for testing large size concrete slabs generally prevents such testing by designers. For this reason, a small-scale joint-performance testing method is introduced. The abrasive action that occurs on the slab face at the joints and cracks of in-service concrete pavement is simulated in this small-scale method. The potential joint performance for a concrete mixture can be tested using 152 mm x 152 mm x 610 mm (6 in. x 6 in. x 24 in.) beams. The loading configuration of the small scale test was established to simulate the deflection profile generated when a slab is loaded with 9-kip wheel load. The test setup was fabricated and a large number of beams were tested. The joint performance results obtained from beams are validated with the joint performance results from a full size slab test. It was found that the joint performance results from both the beams and the full size slab compare well with each other.

This paper was sponsored by TRB committee AFD50 Standing Committee on Design and Rehabilitation of Concrete Pavements.

18-04099

English

4p

2018

Transportation Research Board 97th Annual Meeting

Digital/other

Figures; Photos

Beams; Concrete overlays; Concrete pavements; Cracking of concrete pavements; Interlocking aggregates; Load transfer; Pavement joints; Testing

Highways; Pavements

Transportation Research Board Annual Meeting 2018 Paper #18-04099

TRIS, TRB, ATRI

Jan 8 2018 11:01AM