偏高岭土对水泥土强度影响的机理研究  

Study on Mechanism of Strength Effect with Metakaolin on Cemented Soil

作　　者：刘剑平[1] 白晓红[1,2] 王林浩 

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》2017年第6期27-29,共3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种不同偏高岭土掺量下水泥土的无侧限抗压强度,发现偏高岭土能够增强水泥土的强度,尤其是偏高岭土掺量为3%时,水泥土强度相比于未掺偏高岭土水泥土的强度显著增长。借助X射线衍射(XRD)测试技术和扫描电镜(SEM)图像分析,研究水泥土的水化产物和微观结构,阐述偏高岭土增强水泥土强度的作用机理,用微观机理解释了水泥土宏观力学特性变化的原因。In order to study the effect of metakaolin on cemented soil strength, the unconfined compressive strength tests are conducted to the cemented soil with five contents of metakaolin. It is found that metakaolin can enhance the strength of cemented soil. Especially, when the content of metalkaolin is 3%, its unconfined compressive strength is obviously higher than that of pure cemented soil. The effect of metakaolin on the strength of cemented soil is studied by means of X-ray diffraction（XRD） and scanning electron microscopy（SEM） image analysis. The mechanism of strength increasement of cemented soil with metakaolin is explained by analysis of hydration products and microstructures of cemented soil. The reason of macroscopic mechanical property change of cement soil is proved by microscopic mechanism.

关 键 词：偏高岭土 水泥土 物相分析 微观结构 

分 类 号：TD985[矿业工程—选矿] TU411.6[建筑科学—岩土工程]