Abstract
Waste materials recycling has been the logical and widely accepted means of conserving the diminishing global natural resources. This comes as a result of increased scarcity of raw industrial materials, coupled with environmental hazard of most of the waste products. In this paper, the effect of different waste material fillers, namely heavy oil fly ash (HOFA), coal fly ash, limestone dust, and cement kiln dust, and sulfur on the physical properties and performance of roofing and waterproofing asphalt has been examined. Conventional asphalt consistency tests in addition to a new bond strength test were conducted on the modified asphalt mastic. The results were analyzed statistically and assessed in accordance with ASTM D 332 and ASTM D 449 specifications. HOFA proved to be a superior filler additive compared to the other three additives. The sulfur mixes were found to be short on flash point values, but in spite of this, results show a promising potential alternative and cost effective material composite having the least amount of asphalt content.