文献类型：期刊文献

中文题名：偏高岭土对水泥土动力学性能与微观特征的影响

英文题名：Effect of metakaolin on dynamic properties and microscopic characteristics of cement stabilized soil

作者：夏玉杰[1];贺玮[2]

第一作者：夏玉杰

机构：[1]新乡职业技术学院建筑工程系,河南新乡453000;[2]新乡学院土木工程与建筑学院,河南新乡453000

第一机构：新乡职业技术学院建筑工程系,河南新乡453000

年份：2022

卷号：53

期号：6

起止页码：212-216

中文期刊名：人民长江

外文期刊名：Yangtze River

收录：CSTPCD;;北大核心:【北大核心2020】；

基金：2021年度河南省重点研发项目“低能耗建筑在河南北部农村地区的设计应用研究”(212400410184)。

语种：中文

中文关键词：水泥固化土;偏高岭土;动力学特性;填充效应;微观孔隙结构;NMR;SEM

外文关键词：cement stabilized soil;metakaolin;dynamic characteristics;filling effect;micro-pore structure;NMR;SEM

摘要：为了改善普通水泥固化土的动力学特性与微观结构,在碱激发反应作用下制备了4种不同掺量偏高岭土改性的水泥土样品,并对养护过程中的试样分别开展分离式霍普金森压杆(SHPB)单轴压缩试验、核磁共振(NMR)扫描与电子显微镜(SEM)扫描。结果表明:偏高岭土改性水泥土的动抗压强度随着偏高岭土掺量增加呈现出先增后减的非线性变化趋势,偏高岭土掺量为4%时水泥土的动抗压强度达到极值;复合水泥土的T;曲线为双峰分布,且主峰占较大比例;代表小孔隙的P1峰所占比例超过80%,代表大孔隙的P2峰所占比例随养护时间增加逐渐降低;偏高岭土的改性作用能够促进水化反应的发生,水化硅酸钙和钙矾石填充效应使得材料密实度显著上升,动力学性能提高。研究成果可为偏高岭土的进一步资源化利用提供参考。
In order to improve the dynamic properties and microstructure of ordinary cement stabilized soil, four kinds of modified cement stabilized soil samples with different contents of metakaolin were prepared under the action of alkali excitation reaction.The samples in curing process were subjected to separate Hopkinson pressure bar(SHPB) uniaxial compression, nuclear magnetic resonance(NMR) scanning and electron microscope(SEM) scanning tests.The results showed that the dynamic compressive strength of modified cement soil mixed with metakaolin increased first and then decreased with the increasing of metakaolin content, and the dynamic compressive strength reached the maximum when the metakaolin content was 4%.The T;curve of composite cement soil was bimodal distribution, and the main peak accounted for a large proportion, the proportion of P1 peak representing small pores was more than 80%,and the proportion of P2 peak representing large pores decreased with the increasing of curing time.The modification from metakaolin can promote the hydration reaction, and the filling effect from hydrated calcium silicate and ettringite makes density of the material significantly increased and the dynamic performance improved.The research results can provide reference for further resource utilization of metakaolin.