Waste foundry sand in hot mix asphalt: A review: Fid-Bau Portal

Waste foundry sand in hot mix asphalt: A review

Dyer, Paulo P.O.L. / de Lima, Maryangela Geimba

Highlights • High worldwide production of waste foundry sand (WFS) and mobility demand. • Discussion overview of main researches of HMA with WFS. • Summary of the several advantages of WFS reusing in HMA. • Listing of new researches opportunities in this theme.

Abstract Roads are the main means of transporting cargo and passengers in the world surpassing railroads, airports and ships. The growth of the road network brings urbanization and socioeconomic development to inhospitable regions. As a result, they demand large quantities of natural resources such as mineral aggregates. Thus, there is a need for the use of cheaper and more sustainable alternative construction materials. Waste Foundry Sand (WFS) is an industrial by-product produced in large quantities worldwide. In this sense, in the last decades several researches have been carried out with the objective of studying the partial replacement of fine aggregate by WFS in hot mix asphalt (HMA). Showing that the physical, chemical and environmental characteristics of WFS and its mechanical behaviour in the asphalt matrix are similar to conventional aggregates. However, there are few studies that address the benefits generated by the reuse; which, generate significant environmental and economic benefits worldwide. In this way, this review gathered the main studies of the last four decades on the reuse of WFS in HMA, discussing a panorama of properties and summarizing the several advantages of the reuse. With this, it was aimed to point out the research opportunities in this theme, in order to encourage new studies that stimulate the reuse in real road projects around the world.