Petroleum asphalt has ★↔βgood adhesion and elasticity, whi•§ch can ☆∑ effectively protect the ™£σ∏ground from abrasion and moisture erosio®$↔§n, and can improve the ♥φ↕≤ stability and serv"εice life of the road, and is the mai≤£→n material for road const☆≤>ruction.
