Recycling of Kaolin Processing Waste as Aggregate in Asphalt Concrete

Abstract:

The aim of the present study is to assess the incorporation of kaolin processing waste as partial substitute for aggregates in asphalt concrete. Mixtures elaborated from the conventional mixture with the gradual incorporation of kaolin processing waste (5 to 40%) were evaluated by volumetric composition, mechanical behavior and susceptibility to moisture tests, obeying current Brazilian norms, according with international standards. The results show that the coarse kaolin waste displays grains with varying diameters, and, as such, can substitute part of the conventional aggregates and filler used in an asphalt mixture. Moreover, its mineralogical composition showed the same minerals in the composition of conventional aggregates used in paving. The assessment of the mechanical behavior of these mixtures indicate that the increased waste levels in the mixtures studied caused an increase in stability and a reduction in tensile strength. When susceptibility to moisture was considered, the results indicate that up to 25% of residue can be used as a substitute for conventional aggregates.

• Periodical: Advanced Materials Research (Volume 717)
• Pages: 21-26
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.717.21
• Online since: July 2013
• Authors: Maria del Pilar Durante Ingunza, Olavo Francisco dos Santos Júnior, Cibele Gouveia Costa
• Keywords: Asphalt Concrete, Kaolin Processing Waste, Recycling, Residue

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