International Research Journal of Education and Technology

A Stone Matrix Asphalt (SMA) compositions have changed greatly over time, and recent research has produced some encouraging findings. As a result, the use of SMA mixtures in the production of pavement increased in the paving industries. SMA mixes do, however, provide some difficulties or drawbacks that call for thorough comprehension. The review paper's objective is to outline some of the problems with SMA combinations and potential solutions. It is shown that the researchers are addressing a number of issues (such as aggregate gradation, stone-on-stone contact, drain down, and stabilising chemicals) linked to SMA mixtures. Based on their expertise, geographic location, climatic circumstances, and access to manufacturing facilities, numerous agencies have proposed their own aggregate gradation, and they are doing an excellent job. Stone-on-stone contact is only possible with the right aggregate gradation, and if it is not met, performance will suffer. Steel slag (SS) is an excellent mechanically and morphologically rich aggregate. However, the main issues with using steel slag are its high water absorption rate and subsequent volume expansion. Since it affects the performance of the entire combination, drain down is a major concern in SMA mixtures. Researchers have therefore highlighted how important it is to stop the same. In order to examine the drain down, several researchers used the National Cooperative Highway Research Program (NCHRP No. 424) protocol and ASTM D6390. They came to the conclusion that the drain down should be less than 0.3%. (by weight of mixture). Additionally, to lessen the drain, researchers are experimenting with various stabilising agents. Particularly beneficial stabilising agents include fibres and polymers. Recently, appropriate waste and recycling goods have been used as stabilising agents to lessen environmental contamination and drain down.

Key Words:  Stone Matrix Asphalt, economical, abration, mineralogical, steel slag, Rutting, Reduction of drain down