稻壳灰地聚物固化黄土强度及微观结构试验  

Experimental Study on the Strength and Microstructure of Solidified Loess withRice Husk Ash Geopolymer

作　　者：陈伟 黄志军[2] 徐宏 王滢 施渝吉 CHEN Wei;HUANG Zhijun;XU Hong;WANG Ying;SHI Yuji(School of Civil Engineering,Xinjiang University of Engineering,Urumqi 830022,China;School of Civil Engineering,Lanzhou Jiaotong University,Lanzhou 730070,China)

机构地区：[1]新疆工程学院土木工程学院,乌鲁木齐830022 [2]兰州交通大学土木工程学院,兰州730070

出　　处：《材料导报》2024年第S01期149-153,共5页Materials Reports

基　　金：国家自然科学基金(41662017)。

摘　　要：为研究稻壳灰地聚物对黄土的固化效果及固化机理,通过击实试验、无侧限抗压试验、扫描电镜、X射线试验,结合Image J、MDI Jade图像分析软件进行定量分析。结果表明,随着稻壳灰掺量的增大,固化土最大干密度减小,最优含水率增大;稻壳灰对黄土无侧限抗压强度提升了87.4%,碱激发稻壳灰提升效果更大,最高增幅为黄土的2.36倍,存在稻壳灰最优掺量7.5%,NaOH最优掺量10%;稻壳灰地聚物使土体微观孔隙形态分布分维数逐渐减小,大幅减小了土体孔隙面积与孔隙连通度;稻壳灰地聚物固化土晶面间距比黄土更小,可显著减小土颗粒间的间距,使土颗粒间排列更为紧密,整体性更强。To study the solidification effect and mechanism of rice husk ash geopolymer on loess,quantitative analysis was conducted through compaction test,unconfined compression test,scanning electron microscope,X-ray test,and image J and MDI Jade image analysis software.The results showed that with the increase of rice husk ash content,the maximum dry density of solidified soil decreased and the optimal moisture content increased.Rice husk ash has increased the unconfined compressive strength of loess by 87.4%.Alkali activated rice husk ash has a greater improvement effect,with a maximum increase of 2.36 times.There is an optimal dosage of 7.5%for rice husk ash and 10%for NaOH.The rice husk ash geopolymer reduced the fractal dimension of the micro pore morphology distribution of the soil from 1.554 to 1.062 and 1.004,significantly reducing the pore area and pore connectivity of the soil.The spacing between crystal planes of rice husk ash stabilized soil is smaller than that of loess,which can significantly reduce the spacing between soil particles,making the arrangement of soil particles more compact and overall stronger.

关 键 词：稻壳灰 黄土 碱激发 强度 微观结构 

分 类 号：TU43[建筑科学—岩土工程]