柳钢钢渣沥青混合料三维跨尺度水化胀裂行为与协同调控机制

The steel slag produced by Guangxi Liuzhou Iron and Steel（Group）Company due to large-scale storage has caused serious environmental pollution and social issues， the steel slag used in pavement with high content is an effective way to destocking. The instability of the steel slag asphalt mixture is needed to be solved under hot and humid environment in Guangxi Province. The project intends to study the internal hydration bursting behavior of mixture， the advanced physical and chemical testing methods will be used， and the unique microstructure and response characteristics of the steel slag will be researched. Using X-ray CT and three-dimensional numerical reconstruction techniques， the internal real three-dimensional microstructure of the mixture will be characterized exactly， the steel slag aggregate particle morphology and the distribution of voids will be identified accurately. the cross-scale three-dimensional behavior of slag hydration bursting inside asphalt mixture will be monitored simultaneously based SEM and X-ray CT. The deterioration processes of the structures and the internal voids will be quantified. Furthermore， the process of steel slag asphalt mixture hydration expansion fracture will be represented vividly with the 3D visualization method. The internal hydration expansion behavior of asphalt mixture will be explored from a new angle of the view. On this basis，the synergistic expansion of regulatory mechanisms of the steel slag - void – structure with the regional characteristics will be established，This research will form the basis of theory and technology for the steel slag applying in the pavement under hot and humid environment in Guangxi Province extensively.

柳钢钢渣大规模存放已引起严重的环境污染和社会问题，高掺量钢渣应用于沥青路面为钢渣去库存化提供有效途径，但需解决广西湿热环境下柳钢钢渣沥青混合料体积稳定性问题。本项目拟从柳钢钢渣沥青混合料内部水化胀裂行为作为切入点，采用先进物化测试手段，分析柳钢钢渣自身特有微观结构和物化性能，借助X-ray CT和三维数值重构技术，精细表征钢渣沥青混合料内部真实三维细观结构，准确识别钢渣集料颗粒形态与空隙分布特征，基于X-ray CT同步监测钢渣沥青混合料内部的三维跨尺度水化胀裂行为，量化表征混合料内部空隙和结构的劣化进程，进而以三维可视化方式生动呈现混合料内部水化胀裂过程，从新的视角探究柳钢钢渣在混合料内部空间的具体膨胀行为。并据此建立柳钢钢渣沥青混合料体积膨胀预测方法，构建具有区域特色的钢渣-空隙-结构三元协同膨胀调控机制，为柳钢钢渣大规模应用于广西湿热环境下的沥青路面奠定理论和技术基础。

柳钢钢渣大规模存放已引起严重的环境污染和社会问题，高掺量钢渣应用于沥青路面为钢渣去库存化提供有效途径，但需解决广西湿热环境下柳钢钢渣沥青混合料体积稳定性问题。本项目从柳钢钢渣沥青混合料内部水化胀裂行为作为切入点，采用先进物化测试手段，分析了柳钢钢渣自身特有微观结构和物化性能，借助X-ray CT和三维数值重构技术，精细表征了钢渣沥青混合料内部真实三维细观结构，准确识别了钢渣集料颗粒形态与空隙分布特征，多尺度、全方位的对比和分析混合料内部颗粒的分布特征和接触状态,为柳钢钢渣大规模应用于广西湿热环境下的沥青路面奠定了理论和技术基础。