脱硫锰渣微粉替代矿粉对沥青混合料性能的影响

Effect of Replacing Mineral Powder with Desulphurized Manganese Residue Powder on Properties of Asphalt Mixture

摘要: 将工业废渣用于道路工程中不仅促进资源的合理利用，还有助于推动绿色交通的发展。为研究脱硫锰渣微粉对沥青混合料性能的影响，本文按照不同比例的脱硫锰渣微粉替代矿粉制备沥青混合料，通过车辙试验、冻融劈裂试验，以及低温小梁弯曲试验，分析了不同替代率的脱硫锰渣微粉对沥青混合料高温稳定性、低温抗裂性以及水稳定性的影响。结果表明：脱硫锰渣微粉主要含有的结晶相为石英、硅钙石和石膏等物质，主要成分为SiO₂、Al₂O₃和CaO等且具有多孔隙结构，属于酸性材料；脱硫锰渣微粉替代矿粉提高了沥青混合料的高温稳定性和水稳定性，降低了低温抗裂性；然而，当替代率超过30%时，沥青混合料的水稳定性呈现下降趋势。综合考虑沥青混合料的路用性能，建议其替代量不宜超过30%。

Abstract: The use of industrial waste in road engineering not only promotes the rational use of resources, but also helps to promote the development of green transportation. In this paper, in order to study the effect of desulphurized manganese residue powder on the performance of asphalt mixture, asphalt mixture was prepared by replacing mineral powder with different proportions of desulphurized manganese residue powder. The influence of different substitution rates of desulphurized manganese residue powder on high-temperature stability, low-temperature cracking resistance and water stability of asphalt mixture was analyzed through rut test, freeze-thaw splitting test and low-temperature trabecular bending test. The results show that the desulphurized manganese residue powder mainly contains quartz, calcite, gypsum and other substances in crystalline phase, the main components are SiO₂, Al₂O₃ and CaO, and have a multi-pore structure, which belongs to acidic materials. The high-temperature stability and water stability of asphalt mixture were improved by replacing mineral powder with desulphurized manganese residue powder, and the low-temperature cracking resistance was decreased. However, when the substitution rate exceeds 30%, the water stability of asphalt mixture shows a decreasing trend. Considering the road performance of asphalt mixture, it is suggested that the replacement amount should not exceed 30%.