Published: 2020-09-30

Recycling of cement kiln dust from cement plants to improve mechanical properties of road pavement base course

Ayoup M. Ghrair , Nawal Louzi

Abstract

In the study, the potential of reuse of cement kiln dust (CKD) to improve the stability properties of the base course of road pavements was investigated. CKD was characterized chemically and physically. The results revealed that addition of CKD improved the mechanical properties of the base course significantly. The results showed a significant increase in California Bearing Ratio, from 234.5% measured for untreated base to 334.4%, 362.7% and 384.6% for CKD content of 5%, 15% and 25%, respectively. In terms of chemical composition, CKD is similar to cement. Scanning electron microscope images showed that the average particle size is approximately 0.5 microns. The granules are mainly spherically shaped, with cubic crystals of sodium and potassium salts. The leachability study of CKD in the base course revealed that heavy metal concentrations in CKD are fixed and insoluble in water.

Keywords:

base course, cement kiln dust, highways, pavement, recycled solid waste.

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Ghrair, A. M., & Louzi, N. (2020). Recycling of cement kiln dust from cement plants to improve mechanical properties of road pavement base course. Roads and Bridges - Drogi I Mosty, 19(3), 199–210. https://doi.org/10.7409/rabdim.020.013

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