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 ElectrolyticManganese Slag Field

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。②KH560分子结构中的硅氧基团Si—OCH_(3)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。

In order to solve the problem that the cementitious materials are easy to expand when exposed to water and affect the strength in the insitu repair process of solid waste landfill leakage.KH560 with amphoteric groups was added to sodium 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 consolidated body were analyzed by water seepage test and corrosion test,the molecular structure of the consolidated body was characterized 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 electrolytic manganese slag cementitious material were revealed.The results show that:①the compressive resistance,impermeability 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 0.85.②The siloxy group Si—OCH_(3)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.