With the growing environmental awareness and the increasing problem of finding new material reserves, there has been considerable interest in certain waste products which may be used as construction materials. Waste aggregates (scalpings) obtained from quarry operations are normally plentiful but cannot be used as base course materials because of their unsatisfactory performance. A research had recently been conducted to investigate the possibility of mixing a scalping with steel furnace slag (SFS), blast furnace slag (BFS), and fly ash for use as a base course material within a flexible pavement system.The experimental work was focused in the mix design to satisfy the grading, durability and strength requirements. The aggregate durability was measured in terms of the dry and wet crushing strengths and the wet/dry strength variation, while the strength of the mix was measured by the CBR and the Texas triaxial testing. In terms of durability, it was found that blending the SFS with the scalping could not produce satisfactory wet/dry strength variation. On the other hand, when the BFS was blended with the raw material, the dry and wet strengths of the blend remained low. The results of the investigation demonstrate that both SFS and BFS must be used in the blend to achieve an optimum performance. (A)
Samenvatting