Abstract: Based on the “dual carbon” (carbon peak, carbon neutral) background, the feasibility of using oyster shell as asphalt mineral powder was explored by broadening the ways of oyster shell green waste utilization. Through the preparation of oyster shell mineral powder and microscopic characteristic analysis, it was found that, oyster shell powder had finer particles, larger specific surface area, rougher surface, lower density and better adhesion, compared with dolomite mineral powder. Furthermore, the road performance of oyster shell powder asphalt mortar under five kinds of filler-bitumen ratio conditions was compared by DSR, MSCR and BBR tests, so as to determine the optimal filler-bitumen ratio and construction temperature. The research results show that compared with dolomite mineral powder asphalt mortar, oyster shell powder asphalt mortar has better high-temperature resistance to rutting and mechanical stability. Although its low-temperature performance is slightly inferior to that of dolomite mineral powder asphalt mortar, it still meets the requirements of low-temperature crack resistance well. In consideration of excellent road performance, economy, and environmental friendliness of oyster shell powder, it has good application prospect in pavement construction and maintenance projects.

Key words: highway engineering; oyster shell powder; asphalt mortar; pavement performance; microscopic mechanism; filler-bitumen ratio

摘要： 基于“双碳”背景下，以拓宽牡蛎壳绿色废物利用为途径，探索其用作沥青矿粉的可行性。通过制备牡蛎壳矿粉进行微观特性分析发现，与白云岩矿粉相比，牡蛎壳粉末颗粒更细，比表面积更大，表面更粗糙，密度更低，具有更优的黏结力。在此基础上进一步通过动态剪切流变、多重应力蠕变恢复和弯曲梁流变等试验对比了5种粉胶比条件下牡蛎壳粉沥青胶浆的路用性能，从而确定了最佳粉胶比掺量和施工温度。研究结果表明：与白云岩矿粉沥青胶浆相比，牡蛎壳粉沥青胶浆具有更优的高温抗车辙性能和力学稳定性，其低温性能虽略逊于白云岩矿粉沥青胶浆，但仍满足较好的低温抗裂性能要求。鉴于牡蛎壳粉具备良好的路用性能、经济性与环保性，其在路面新建及养护工程中具有较好的应用前景。

关键词: 道路工程；牡蛎壳粉；沥青胶浆；路用性能；微观机理；粉胶比