Stiffness, Axial Deformation and XRD Analysis of New Cold Mix Asphalt Containing Cementitious Waste Materials for Road Pavement

摘要

This paper reports the stiffness, axial deformation and XRD analysis of a new cold mix asphalt developed for use in highway and airfield pavement structural layers including surfacing pavement. The main filler in the traditional Cold Mix Asphalt (CMA) is replaced with treated biomass waste fly ash materials. The waste or by-product materials were used as a modifier of the cold bitumen mixtures. The new CMA has minimise the restriction imposed by road engineers on the use of cold bituminous emulsified mixtures by improving its mechanical and durability properties and hence provided a cheap products with less CO_2 emissions and less energy consumption compared with Hot Mix Asphalt (HMA). Fly ash which is waste or by-product material was incorporated in the cold bituminous emulsion mixtures at five percentages 0-5.5% of aggregate weight in the mixture. The results have shown outstanding comparative improvement in the mechanical properties of the new cold mixtures compared with traditional cold mix asphalt. The reason for achieving these results was explained in this paper by the analysis of XRD of the fine mineral-emulsified mortar used in this study.