KH560对电解锰渣场原位修复防渗固结体性能的影响
Effect of KH560 on the Performance of In-situ Repair of Anti-seepage Consolidation in Electrolytic Manganese Slag Field
周珏 1王玥 1周颖 1姜鹏 1张大斌1
作者信息
- 1. 贵州大学机械工程学院,贵州 贵阳 550025
- 折叠
摘要
固废填埋场渗漏原位修复过程中常见胶凝材料遇水膨胀,影响强度情况,为了解决该问题,采用两步水溶液聚合法将具有两性基团的KH560 加入聚丙烯酸钠与电解锰渣中,制备电解锰渣基复合胶凝材料,通过抗压试验、渗水试验及腐蚀试验分析了固结体的抗压抗渗及耐腐蚀性能,利用红外光谱(FTIR)对固结体的分子结构进行了表征,通过SEM-EDS分析了固结体的表面形貌及元素含量变化,揭示了KH560 对电解锰渣胶凝材料的力学增强机制和防渗作用机理.结果表明:① 适量添加KH560 可显著提升复合胶凝材料的抗压、抗渗及耐腐蚀性能,在KH560 添加量为 3%时,固结体的无侧限抗压强度是未添加KH560 的固结体的 2.25 倍,渗透系数比未添加KH560 的固结体降低了61.3%,抗蚀系数达 0.85.② KH560 分子结构中的硅氧基团Si—OCH3 与电解锰渣中的自由水发生了水解缩合反应,形成了Si—O—Si连接结构,减少了水隙通道,使固结体表面平整光滑,抗渗效果和耐腐蚀性能得到显著提升.
Abstract
In order to solve the problem that the cementitious materials are easy to expand when exposed to water and af-fect the strength in the in-situ repair process of solid waste landfill leakage.KH560 with amphoteric groups was added to sodi-um polyacrylate and electrolytic manganese slag by two-step aqueous solution polymerization method to prepare electrolytic manganese slag-based composite cementitious materials.The compressive impermeability and corrosion resistance of the consol-idated body were analyzed by water seepage test and corrosion test,the molecular structure of the consolidated body was charac-terized by infrared spectroscopy(FTIR),and the surface morphology and element content changes of the consolidated body were analyzed by SEM-EDS,and the mechanical enhancement mechanism and anti-seepage mechanism of KH560 on the elec-trolytic manganese slag cementitious material were revealed.The results show that:① the compressive resistance,impermeabili-ty and corrosion resistance of the composite cementitious material can be significantly improved by adding KH560 in an appro-priate amount 3%,and the unconfined compressive strength of the consolidated body is 2.25 times that of the consolidated body without KH560,and the permeability coefficient is 61.3%lower than that of the consolidated body without KH560,and the cor-rosion resistance coefficient is 0.85.② The siloxy group Si—OCH3 in the molecular structure of KH560 underwent a hydrolyt-ic condensation reaction with the free water in the electrolytic manganese slag to form a Si—O—Si connection structure,which reduced the water gap channel,made the surface of the consolidated body smooth,and significantly improved the impermeability effect and corrosion resistance.
关键词
KH560/电解锰渣/抗压强度/渗透系数/作用机理Key words
KH560/electrolytic manganese slag/compressive strength/permeability coefficient/mechanism of action引用本文复制引用
基金项目
黔科合重大专项([2022]004)
贵州省科技支撑计划(黔科合支撑[2021]485号)
贵州省科技支撑计划(黔科合支撑[2023]346号)
出版年
2024
NETL
NSTL
万方数据