碳化处理含钢渣建筑材料的体积安定性研究进展

作者：邵旭阳¹’²,贺智敏¹’²,陈鑫¹

作者简介：

邵旭阳，硕士研究生，E⁃mail:741321076@ qq. com

作者单位：

1.宁波大学土木工程与地理环境学院，浙江宁波 315211;2.宁波大学滨海城市轨道交通协同创新中心，浙江宁波 315211

基金项目：

∗国家重点研发计划（2019YFD1101002）；宁波大学滨海城市轨道交通协同创新中心开放基金（2020004）

摘要：

钢渣是炼钢排出的固体废渣，我国钢渣产量巨大，但综合利用率低，占用土地且污染环境，迫切需实现钢渣的资源化利用。近年来已开始将钢渣作为胶凝材料或骨料应用在建筑材料中，已有研究和工程实践表明，钢渣中f⁃CaO 和 f⁃MgO 在服役期间遇水会造成体积膨胀，引发建筑材料的体积安定性不良问题，故解决钢渣的体积安定性问题是实现钢渣资源化利用的关键。研究发现钢渣具有较高的碳化反应活性，碳化反应可消耗钢渣中的 f⁃CaO 和f⁃MgO,通过碳化处理可改善含钢渣建筑材料的体积安定性不良问题，为钢渣的推广应用提供新途径。基于已有研究，综述了碳化处理含钢渣建筑材料的体积安定性研究进展，介绍了钢渣的组成和分类，探讨了钢渣的膨胀机理，综述了碳化温度、水固比、湿度、粒径和级配、CO2 浓度和压力、碳化时间、外加剂等碳化因素对含钢渣建筑材料体积安定性的影响，针对研究现状和存在的问题提出了碳化钢渣建筑材料进行工程应用的研究方向。

关键词：钢渣；体积安定性；游离氧化钙；游离氧化镁；RO 相；碳化

English：

Steel slag is a solid waste residue produced during steelmaking. China has a huge output ofsteel slag, but the comprehensive utilization rate is low, occupying land and polluting the environment. Itis urgent to realize the resource utilization of steel slag. In recent years, there has been a certain level ofutilization of steel slag as a cementitious material or aggregate in building materials. Research andengineering practices have shown that the f⁃CaO and f⁃MgO in steel slag can cause volume expansionduring hydration in service, leading to poor volume stability of building materials. Therefore, solving thevolume stability problem of steel slag is the key to achieving its resource utilization. It has been found thatsteel slag has a high carbonation reaction activity, and carbonation reaction can consume the f⁃CaO and f⁃MgO in steel slag. Carbonation treatment can improve the poor volume stability of building materialscontaining steel slag, providing a new pathway for the widespread application of steel slag. This paperreviews the research progress on the volume stability of building materials containing carbonated steelslag, introduces the composition and classification of steel slag, discusses the expansion mechanism ofsteel slag, and summarizes the effects of carbonation factors such as carbonization temperature,water⁃to⁃solid ratio, humidity, particle size and gradation, CO2concentration and pressure, carbonation time, andadmixtures on the volume stability of building materials containing steel slag. Based on the currentresearch status and existing issues, research directions for further engineering application of carbonatedsteel slag in building materials are proposed.

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