Moisture

Moisture susceptibility is one of the causes of failure of asphalt pavements. Although all damage to asphalt pavements is not due to the presence of water, the presence of water exacerbates the failure of the asphalt, such as cracking, sloping and so on.Extreme weather reduces mechanical strength and hardness of asphalt mixtures and eventually It leads to their failure.Therefore, reducing the factors leading to the sensitivity of asphalt mixtures can have a significant impact on reducing their maintenance costs.Bitumen and sand are two of the main components of asphalt mixes. Moisture in two ways Destroys asphaltic:

1. The bonding between bitumen and mastic (mix of bitumen and filler) with coarse sand aggregate

2. Weakening of stickiness due to the presence of water

The replacement of the coating of bitumen from the surface of sand with water is called nibble.The phenomenon Nibbling depends largely on the chemical composition of bitumen and their desire to absorb each other.
Therefore, the intrinsic properties of each sand and bitumen aggregate will have a great effect on the performance of asphalt pavement.Commonly used asbestos mixing techniques reduce bituminous mixing with different additives. Gilsonite is an appropriate additive that, in addition to improving the functional properties of the mixture, Available and economically better.It has been proved by various experiments that adding Gilsonite to asphalt mixtures increases their moisture resistance.Identifying hypersensitive compounds and mixtures is very important.
Many experiments have been done to determine the moisture sensitivity of asphalt mixtures, including the testing of the D3173 ASTM.