Evaluation of Moisture and Rutting Resistance of Modified Warm Mix Asphalt with a Mineral Additive

The importance of environmental protection in the construction of pavement has led to that in recent years the warm mix asphalt technology as a new method has always been to reduce environmental damage and reduce the cost of manufacturing and it recognizes as an environment-friendly technology, and this be used. This technology has the advantage of reducing the temperature of mixing and compaction and other benefits, has a weak point of moisture susceptibility and rutting. The use of anti-stripping additives is one of the ways to improve the moisture resistance of these types of asphalt mixtures. This research was conducted with the aim of using different percentages of Gilsonite as a modifier in warm mix asphalt (WMA) and also to investigate its effect on functional properties especially the moisture sensitivity of warm mix asphalt. In order to investigate the effect of Gilsonite on reducing moisture sensitivity, the Lottman modified test were used and also, the resilient modulus and dynamic creep testing were used to investigate the performance properties, which the results showed that Gilsonite due to its inorganic compounds increased bond adhesion of bitumen and aggregate. Also, it has the characteristics of an anti-stripping material and could be causing to increase the life of the warm mix asphalt against moisture damage in wet areas. furthermore, the results of the dynamic creep test indicated that Gilsonite significantly increased the asphalt mixture resistance against the rutting and it was an appropriate additive to prevent the rutting of asphalt mixture in the tropical region (south of the country).