The effect of different aggregate types and grandation on the moisture susceptibility of b

Moisture susceptibility in bitwninous mixture reduces the strength and
durability of the bitwnen pavement due to the presence of water. Water disrupts the
bond between aggregate and bitwnen. Because aggregate comprises 95% of
bituminous mixtures, it has a major effect on the performance of mixture. Thus, the
choice of right aggregate is important to reduce the presence of water. There are two
points that have been identified in stripping: a failure of bonding of the binder to the
aggregate (failure of adhesion) and a failure within the binder itself (failure of
cohesion). The lab tests were conducted by employing four combinations of granite
and limestone with two different aggregate gradations to fmd the effect between these
two aggregates in the moisture susceptibility of bituminous mixtures. The result from
Indirect Tensile Strength ratio and Retained Marshall shows that granite and gap
graded have high potential to water susceptibility. The stripping of aggregate was
not clearly show by visual inspection. It is appear that the failure may be derive from
the adhesion or cohesion failure within the mixture.