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Aggregates Provide Pavement Friction

Published Sunday, June 01, 2003

Skidding accidents on wet pavements is a critical safety issue for highway and aviation agencies. Aggregates play a major role in providing friction and texture, and consequently, in skidding accidents. Dry pavements usually provide good tire-pavement friction, whereas wet pavements reduce skid resistance. Wet friction depends on the hardness of aggregate minerals exposed on the surface and their micro-texture* roughness. Also, for speeds over about 40 mph, pavement macro-texture* is necessary to prevent hydroplaning by helping water escape from the tire-pavement interface. For Portland Cement Concrete pavement, finishing and texturing equipment (floats, drags, tines or grooving) provides the ...

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