Na_2SO_4环境下CMK-水泥土强度机理的研究  

Study on Strength Mechanism of CMK-Cemented Soil under Na_2SO_4 Environment

作　　者：刘剑平[1] 武涛 郝羽婷 白晓红[1,2] Liu Jianping;Wu Tao;Hao Yuting;Bai Xiaohong(College of Architecture and Civil Engineering,Taiyuan University of Technology,Taiyuan,Shanxi 030024;Key Laboratory of Geotechnical and Underground Engineering of Shanxi Province,Taiyuan,Shanxi 030024)

机构地区：[1]太原理工大学建筑与土木工程学院,山西太原030024 [2]山西省岩土与地下工程重点实验室,山西太原030024

出　　处：《非金属矿》2018年第5期7-10,共4页Non-Metallic Mines

基　　金：国家自然科学基金(51178287);山西省科技创新重点项目(2014131019);山西省高等学校大学生创新创业训练计划项目(2017060)

摘　　要：通过测试5种煤系偏高岭土掺量下,在清水养护和不同质量浓度硫酸钠溶液养护环境中煤系偏高岭土水泥土的无侧限抗压强度,结合X射线衍射(XRD)物相分析技术和扫描电镜(SEM)微观图像,从化学反应、物相组成、微观结构等方面对煤系偏高岭土水泥土强度变化机理进行综合分析。结果表明,当硫酸钠溶液的质量浓度小于18 g/L时,随着硫酸钠溶液质量浓度的增加,生成的水化产物能促进煤系偏高岭土水泥土抗压强度的增加,硫酸钠溶液的质量浓度为18 g/L时达到最大值;当硫酸钠溶液的质量浓度大于18 g/L时,生成的水化产物产生较大的膨胀力,导致煤系偏高岭土水泥土抗压强度降低。The unconfined compressive strength of coal-metakaolin cemented soil with 5 contents of coal-metakaolin were tested,respectively,in the maintenance environment of clear water and 5 different concentrations of sodium sulphate solution.The chemical reaction,phase composition,and microstructure of coal-metakaolin cemented soil were analyzed by X-ray diffraction(XRD)phase analytical techniques and microscopic scanning electron microscopy(SEM)image experiments.The results showed that when the concentration of sodium sulfate solution was less than 18 g/L,the increase of compressive strength of coal-metakaolin cemented soil can be promoted by the hydration products with the increase of the concentration of sodium sulfate solution,when the concentration of sodium sulfate solution was 18 g/L,the compressive strength of cemented soil reaches the maximum.however,when the concentration of sodium sulfate solution was greater than 18 g/L,a large expansion force was produced by the hydration products,which promoted the reduction of the compressive strength of coal-metakaolin cemented soil.

关 键 词：硫酸钠 煤系偏高岭土 水泥土 物相分析 微观结构 抗压强度 

分 类 号：TU411.6[建筑科学—岩土工程]