FACTORS INFLUENCING TRACK FORMATION IN ASPHALTS

Abstract

At the TUB Department of Highway and Traffic Engineering track formation tests haye been pursued for years. At this test a rubber wheel with 0.4N /mm² load is moying up and down on the warm asphalt specimen. A test series has been made for studying the influence of natural sand content of the natural mineral carcass and the hardness of bitumen on track formation. Although mixtures made with 100% crushed sand haye the minimum warm deformation. increasing natural sand proportion aboye 75/25% reduces warm deformation at a low rate. The application of hard bitumen also reduces track formation but it is important to say that near to the softening point of the applied bitumen asphalt properties change steeply.