Abstract
AbstractSurfacing seals consist of a combination of bitumen and aggregate, and are used to provide an all-weather surfacing to protect underlying layers and provide safe access to vehicles traveling on a road. Analysis of a number of sections in Gauteng, South Africa has shown that surfacing seals lost a large proportion of their aggregate where the road was crossed by a bridge. As all original properties of the seal components and the traffic on the road were similar, it was deduced that the microclimate where the road traveled underneath the bridge should have caused this localized failure condition. In this paper, the phenomenon is investigated through analysis of the microclimate underneath the bridge, the material properties of the surfacing seal, and the combined effect of these factors on the performance of the seal. It is shown that the microclimate can affect the performance of an otherwise suitable surfacing seal to such an extent that the performance of the seal is severely compromised. A proce...
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