锂土改性水泥-水玻璃浆液的试验  

Test of Li-bentonite Modified Cement-water Glass Grout

作　　者：周瑶 王贵和[3] 刘长友[1] 常永浩 ZHOU Yao;WANG Gui-he;LIU Chang-you;CHANG Yong-hao(School of Mines,China University of Mining and Technology,Xuzhou 221116,China;General Prospecting Institute,China Administration of Coal Geology,Beijing 100039,China;School of Engineering and Technology,China University of Geosciences(Beijing),Beijing 100083,China;Guangzhou Construction Engineering Quality and Safety Testing Center Co.,Ltd.,Guangzhou 510440,China)

机构地区：[1]中国矿业大学矿业工程学院,徐州221116 [2]中国煤炭地质总局勘查研究总院,北京100039 [3]中国地质大学(北京)工程技术学院,北京100083 [4]广州建设工程质量安全检测中心有限公司,广州510440

出　　处：《科学技术与工程》2022年第30期13460-13466,共7页Science Technology and Engineering

基　　金：国家自然科学基金(52074267);企事业单位委托科技项目(3-4-2018-008)。

摘　　要：锂基膨润土(简称锂土)具有吸水能力强、吸附能力好、悬浮性能高等优点,有望弥补水泥-水玻璃(cement-sodium silicate,CS)浆液易离析、凝胶时间调节精度有限等缺陷。为查明锂土对CS浆液性能的影响,以质量比为0、5%、10%、15%、20%、25%和30%的锂土替代CS浆液中的水泥,考察了锂土对CS浆液的表观黏度、析水率、凝胶时间、早期抗压强度和水化产物的影响,得到了最优配合比。试验结果表明,锂土增加了浆液的表观黏度,有效降低了CS浆液的析水率,提高了浆液稳定性;在锂土掺量为10%以内时,可以缩短浆液的凝胶时间,而在锂土掺加20%左右时,可以提高浆液的早期强度。可见锂土能有效弥补CS浆液的缺陷。X射线衍射结果表明,锂土未改变CS浆液的水化产物类型。Lithium-based bentonite(referred to as Li-bentonite)has the advantages of strong water absorption capacity,good adsorption capacity,and high suspension performance.It is expected to make up for the defects of cement-sodium silicate(CS)slurry,which has the disadvantage of being easy to segregate and has limited accuracy in setting time adjustment.In order to find out the effects of Li-bentonite on the properties of CS slurry,the mass ratio of 0,5%,10%,15%,20%,25%and 30%Li-bentonite was used to replace part of cement in CS slurry.The effects of Li-bentonite on the apparent viscosity,bleeding,setting time,early compressive strength and hydration products of CS grout were investigated.The mixing ratio of grouts was analyzed,and the optimal mixing ratio was obtained.The experimental results show that the Li-bentonite increases the apparent viscosity,effectively reduces the bleeding and improves the stability of slurry.The 0~10%of Li-bentonite shortens the setting time and 20%of Li-bentonite improves the early strength of the hardened slurry.In addition,it is found that the defects of CS slurry can be effectively compensated by Li-bentonite.X-ray diffraction test shows that no new minerals are formed in the CS grout with the addition of Li-bentonite.

关 键 词：锂基膨润土 水泥-水玻璃注浆材料 浆液配比 室内试验 堵水加固 

分 类 号：TU502.4[建筑科学—建筑技术科学]