Control of Pavement-Surface Temperature-Rise by Top Filling with Geopolymer Mortar Containing Oyster Shell Aggregate

Abstract

High temperatures of the asphalt concrete pavements in summer contribute to the heat island phenomenon in the urban areas. The effective cool-pavement technologies are sought to mitigate the pavement environment. In this paper, developed heat-reflective pavements are constructed from open-graded asphalt concrete, in which voids in the upper part of the pavement are filled with a geopolymer, containing recycled materials as a fine aggregate. Crashed oyster shells and roof tile debris were used in this study. The temperature reduction of the pavement surfaces at an open site is measured in the summer. The results show that the maximum surface temperature of the pavements filled with geopolymer mortars containing oyster shell aggregates falls by approximately 11℃ compared to the asphalt concrete pavement.