Aggregate interlock efficiency at concrete pavement joints

Paper and Presentation by Anna-Carin Brink from ASCP 3rd Concrete Pavements Conference 2015

The aim of this paper is to present the aggregate interlock efficiencies achieved at concrete pavement joints, by doing a comparison between South African and American aggregates. It presents an investigation into modelling aggregate interlock shear transfer in jointed concrete pavements in order to develop a model suitable to South African conditions. The data obtained from laboratory studies, using South African aggregates, was compared with results obtained from a similar study on typical aggregates used in the United States of America. One of the conclusions reached from the study on South African aggregates was that there was no significant deterioration of the crack face during dynamic loading, which indicated that fatigue of the aggregates at the joint face did not play a role. This could be attributed to the high quality crushed stone used in South Africa. Furthermore, it was shown that jointed concrete pavements constructed with South African aggregates, relying only on aggregate interlock for load transfer, performed better than similar pavements constructed with American aggregates. The parallel can be drawn to similar aggregates in Australia; on either end of the scale.

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