Use of industrial waste as a substitute for conventional aggregates in asphalt pavements: A review

Abstract

The need to save natural resources has paradigmatic attitude changes, such as the need to value waste materials in order to reduce landfill and minimize the use of raw materials. The objective of this work is to show the contribution of existing literature about the incorporation of industrial wastes in asphalt pavements. Thus, some of the main industrial wastes that can be incorporated in asphalt mixtures as aggregate substitute are steel slag, foundry sand and fly ash. This wastes are produced on a large scale on the planet, and the literature shows that, when treated for use in road pavements, their mechanical properties are similar or superior to conventional aggregates. Thus, according to the studies presented here, the incorporation rates vary from 5 to 15% for foundry sand, 70% for steel slag and 30% for fly ash. When incorporated in asphalt pavements, the dangerous elements may be encapsulated in the mixture, reducing their environmental toxicity.