Coat Ability and Moisture Resistance of Asphalt Emulsion Modified with High-Ammonia Natural Rubber Latex

Abstract

Asphalt is a widely used material in the road construction industry. It has the ability of bonding or adhering the aggregate materials together. From previous literatures, it was found that adding natural rubber to the hot mix asphalt cement can improve the performances of asphalt binder. The improve properties of natural latex modified asphalt cement include high stability, good fatigue resistance and flexibility. Therefore, a type of CMS-2h cold mix asphalt binder, which commonly used for pavement surface patching, was mixed with natural rubber latex and characterized in this research. Target properties of natural rubber modified CMS2h analyzed in this research are aggregate coating and moisture sensitivity in accordance with ASTM D 244. This standard test is usually used to indicate the moisture resistance and anti-scaling performances required by pavement patching materials. The standard criteria for aggregate coating in wet and dry condition is 60% and 80%, respectively. For this research, CMS-2h asphalt emulsion was mixed with concentrated natural latex at 1%, 3% and 5% mixture ratios in the laboratory. The coating test shows that CMS-2h with natural rubber of 1% can be used for pavement patching and repair.