Performance Characterization of Superior Performing Cold Mix Asphalt with Fly Ash Modification: Volumetric Approach
摘要
The objective of this study was to investigate the impact of additives like Fly ash, Ground Granulated Blast Furnace (GGBS) slag, and Lime on the performance of CMA, and correlate them with mix volumetrics. The scope of this study included preparation of CMA, fundamental characterization of CMA at various curing times, and comparison of control and modified CMA strength properties through Indirect Tensile Strength Test (ITS) and Tensile Strength Ratio (TSR). Four types of CMA were considered wherein filler contents and types were varied. The test findings revealed that when 50% Fly ash, 25% GGBS, and 25% Lime were used in the place of mineral filler, the strength of the mix improved significantly. However, the addition of Fly ash without any other additives yielded lower strength as measured by stability when compared to the mix without any additives (control mix). Furthermore, the ITS of CMA mixes prepared with only Fly ash produced marginal changes with respect to the control mixes. The mix, containing 50% Fly ash, 25% GGBS, and 25% Lime as filler material, exhibited the lowest Voids in Mineral Aggregate (VMA) and total voids compared to all other mixes, which resulted in higher strength. Hence, it can be concluded that the additives not only impacted the strength but also contributed to the volumetric properties of CMA. It is envisioned that the study findings will provide important insights into the volumetric and its associated performance of CMA that contributes to state-of-the-art akin to sustainable technologies in pavement engineering.