Effect of Aggregate Spacing on Skid Resistance of Asphalt Pavement

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Abstract
In the design of skid resistant asphalt pavements, it is a common practice in pavement engineering to perform laboratory tests to ensure that the paving aggregate has the required frictional resistance and wheel-polishing resistance, and to specify a minimum surface texture depth of the completed pavement to provide adequate surface drainage for safe travel in wet weather. These controls, however, may not be adequate for all types of pavement construction. For instance, field experience in Singapore indicated that aggregate spacing, or gap width between aggregates, had important effects on the skid resistance of asphalt pavements. This paper describes a laboratory study to examine the effect of aggregate gap width on frictional resistance of laboratory prepared specimens. Aggregate gaps ranging from 2 to 10 mm were studied. The 2 mm gap represents that of a dense graded mix, while 10 mm gaps are found in a typical porous asphalt mixture. The British pendulum tester was adopted for the experimental evaluat...

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