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This research was proposed aiming an in deep study of the mechanism of load transfer across concrete pavement joints including the analysis of which factors influence such load transfers with special regards to the climate factors as concrete temperature. The concrete pavements under study were built in 1999 as a research supported by FAPESP, whose experimental sections has not been used before for such a goal. Backcalculation techniques were employed to analyze deflection data collected with FWD tests over the slabs and it was possible to define values for the test sections materials parameters like concrete modulus of elasticity and the modulus of subgrade reaction. Tests detected loss of load transfer efficiency on the dependence of concrete temperature for non dowelled joints. For dowelled joints, whatever the season of the year or period of the day, joint load transfer efficiency was at least 90% approximately. However, without dowels, efficiency ranged from 60 to 75%. No expressive dependence on the load level was observed during tests, as well as on the slab thicknesses, for cases of dowelled joints. It was observed the increase in the value of the modulus of subgrade reaction when loads were applied in joint position, although not so expressive as sometimes described in the literature. Ranges for concrete and rolled compacted concrete modulus of elasticity resulted similar to former values got from the construction period in laboratory. Therefore, backcalculation procedures using ISLAB2000 software is understood as a valuable tool for concrete slab characterization.

Estudo dos fatores que afetam a transferência de carga em juntas de pavimentos de concreto simples.