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Trends in Transport Engineering and Applications

Performance Evaluation of Modified Cold Mix Asphalt by Some Waste Materials

  1. Amjad Shamsuldeen M. Al-Her

Abstract

The aim of study is to evaluate modified CMA volumetric, mechanical and durability properties by some waste materials. Previous studies described that the mechanical properties of CMA are shown to be influenced by different factors including base bitumen grade, porosity of the mix, curing time and additives. The current research is designed to use the waste and by-product materials as filler to enhance the conventional CMA early age strength. Hence, Corn Waste Ash (CWA), Cement Kiln Dust (CKD), Ordinary Portland Cement (OPC) and Silica Fume (SF) are used as replacement of CMF% to improve the mechanical properties and durability of CMA, the waste or by-product materials are used as a replacement for CMF portion, with percentages ranging from 25–100% from the filler weight. However, CWA has been proven as a unique material to upgrade the mechanical and durability properties of the CMA as replacement 25% OPC by CWA, also replacement 25% OPC by CKD has been proven as a unique material to upgrade the mechanical and durability properties of the CMA. Additionally, Silica Fume is used as an activator for OPC, CWA and CKD at levels within the acceptable range of (8-16)% from the weight of filler in the mix; SF added further improvement to CMA and it’s played a vital role in activating the CWA, CKD and OPC, also accelerating the hydration process which generate binding properties within the bitumen emulsion mixture, where it’s water absorptive ability minimized the trapped water and rapidly improved the mixture’s early and long-term strength, mechanical and durability properties, the products of the hydration process seem to reinforce the bituminous binder. The results obtained in this research work from these laboratory trials are very encouraging and appear modified for CMA which is based completely on sustainable techniques offer unique alternatives to hot mixtures, as a comparative study for results has been done on basis of the Marshall Stability, flow, density, air voids content, indirect tensile strength test, wheel track apparatus test, and durability tests (water sensitivity) for CMA and compared with results of HMA.
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