外加剂对盐渍土改性材料耐久性能的影响  

Effect on Durability of Saline Soil Modified Materials of Admixture

作　　者：刘志华[1] 李园枫 曲烈[1] 荣辉[1] LIU Zhihua;LI Yuanfeng;QU Lie;RONG Hui(School of Materials Science and Engineering,TCU,Tianjin 300384,China)

机构地区：[1]天津城建大学材料科学与工程学院,天津300384

出　　处：《天津城建大学学报》2016年第5期361-367,共7页Journal of Tianjin Chengjian University

基　　金：国家科技支撑计划项目(2014BAL03B03)

摘　　要：通过掺加硅酸钠与氯化钙复配激发剂与硬脂酸钙防水剂,研究了外加剂对盐渍土改性材料的水稳定性、抗硫酸盐侵蚀性和抗冻性的影响.结果表明:掺加6%,的激发剂时,盐渍土改性材料的软化系数由0.52提高到0.68;硫酸盐干湿循环次数基本无变化;冻融循环强度损失率由45.53%,下降至32.89%,;盐渍土中部分石英、钠长石矿物发生部分解构.在掺加6%,激发剂的基础上,再掺加4%,的防水剂时,盐渍土改性材料的软化系数由0.68提高到了0.86,硫酸盐干湿循环次数由3次提高到20次,冻融循环强度损失率由32.8%,降低至3.0%,,黏土颗粒表面存在一层疏水性的薄膜.The effects of different proportion of exciting agent and waterproof agent on softening coefficient,sulfate resistance and frost resistance and their mechanism have been studied by adding sodium silicate and calcium chloride as the exciting agent and calcium stearate as the waterproof agent.The results show that adding 6%, of exciting agent,the softening coefficient of saline soil modified materials increases from 0.52 to 0.68,while sulfate dry-wet cycle times have no change,the strength loss rate of freezing-thawing cycle decreases from 45.53%, to 32.89%,,while the quartz and albite in the saline soil is activated;Adding 4%, of waterproof agent again,the softening coefficient of saline soil modified materials increases from 0.68 to 0.86,while sulfate dry-wet cycle times raises from 3 to 20,the freezing-thawing cycle strength loss rate reduces from 32.8%, to 3.0%,,and the hydration products and clay particles has been covered by a layer of hydrophobic membrane.

关 键 词：盐渍土改性 激发剂 防水剂 软化系数 抗冻性 抗硫酸盐侵蚀 

分 类 号：TU522.04[建筑科学—建筑技术科学]