The Effects of Iraq Natural Asphalt on Mechanical Properties of Bituminous Hot Mixtures

The increasing rate of traffic every day requires the roads to be made more stable. In order improve low and high temperature properties bituminous mixtures forming coating layer flexible pavements, binder in mixture is often modified with various polymers. most commonly used polymer modification styrene-butadiene-styrene (SBS). However, SBS, which very successful improving mechanical mixtures, expensive has brought search for cheaper alternative additives. this context, natural asphalts (NA) are not subjected any processes as additive. study, asphalt obtained from Zaho region Iraq was 20%, 35% 50% bitumen by weight. prepared different amount NA were compared 4% SBS mixtures. As a result, significantly improved particular, above NA, exhibited superior performance resisting effect repeated loads. It found that an average 17.3% similar behavior provided significant economic savings.