Effect of Varying Amounts of Sandstone on the Performance of Asphalt Mixtures in Arkansas

There is a large variety of aggregates used across the state of Arkansas and the rest of the country. However, it cannot be presumed that each of these aggregates will be compatible with the commonly used asphalt binder of an area; this can lead to performance issues and premature pavement damage. Recent studies have called into question the usage of large amounts of sandstone in asphalt mixtures in Arkansas, for its possible link to premature pavement damage and moisture susceptibility. This study aimed to analyze the performance effects of using variable amounts of sandstone to determine the performance relationship among different amounts of sandstone in mixtures along with those with different types of aggregates. This study utilized test methods to analyze the cracking, rutting, and moisture susceptibility of mixtures produced in plants and laboratories. It was found that the most severe performance issues with sandstone usage occurred with at least 63% sandstone in the mixtures and were specifically detrimental to the cracking and moisture resistance of a mixture.