摘要
为了研究粉煤灰掺量对水泥土渗透性能的影响,通过在粉煤灰水泥土中加入水玻璃激发粉煤灰活性,并制作不同固化剂配比的粉煤灰水泥土试块,在养护不同龄期后分别进行渗透试验以及电镜试验。试验结果表明:随着养护龄期的增加,所有粉煤灰水泥土试样的渗透系数都有显著的降低;水泥掺量为60%的粉煤灰水泥土较纯水泥土而言,在养护14 d前的渗透系数更大,但在养护28 d后的渗透系数则变得较低;渗透试验反压差对于养护龄期较短的试样影响较大;在微观角度,水泥土试样的内部孔隙结构与渗透系数之间有着明显的相关性。
In order to study the effect of fly ash content on the permeability of soil-cement,fly ash soil-cement test blocks with different curing agent ratios were prepared by adding water glass into fly ash soil-cement to stimulate fly ash activity.Then penetration test and electron microscopy test were carried out at different curing ages.The test results show that the permeability coefficients of the two cement soils are significantly reduced with the increase of curing age.Compared with pure soil-cement,fly ash soil-cement with 60%cement content has a higher permeability coefficient before curing for 14 days,however,the permeability coefficient after curing for 28 days becomes lower.The backpressure difference of permeability test has a great influence on the samples with short curing age.From the microscopic point of view,there is a clear correlation between the internal pore structure of the cement soil samples and the permeability coefficient.
作者
崔靖俞
解邦龙
季港澳
纪曦
张吾渝
CUI Jing-yu;XIE Bang-long;JI Gang-ao;JI Xi;ZHANG Wu-yu(School of Civil Engineering, Qinghai University, Xi'ning 810016, China)
出处
《科学技术与工程》
北大核心
2019年第34期323-329,共7页
Science Technology and Engineering
基金
国家自然科学基金(51768060)
青海省科技厅项目(2017-ZJ-792)
青海省科技厅项目(2017-HZ-804)
青海大学土木创新基金(TC2019-02)资助
关键词
粉煤灰
龄期
反压差
渗透系数
微观结构
fly ash
age
backpressure difference
permeability coefficient
microstructure
作者简介
第一作者:崔靖俞(1993—),男,汉族,山西太原人,硕士研究生。研究方向:岩土工程地基处理。E-mail:569705436@qq.com;通讯作者:张吾渝(1969—),女,汉族,河南荥阳人,硕士,教授。研究方向:岩土工程。E-mail:qdzwy@163.com。
