激发剂对高掺量碱矿渣流态固化土基本性能的影响研究  

Study on the effect of exciters on the basic properties of fluid solidified soil with high dosage of alkali slag

作　　者：石成恩 缪锋 许华聪 陈峰[2] 沈世林 SHI Cheng'en;MIAO Feng;XU Huacong;CHEN Feng;SHEN Shilin(Fujian Yongzheng Construction Quality Inspection Co.Ltd.,Fuzhou 350012,China;School of Engineering,Fujian Jiangxia University,Fuzhou 350108,China;Zijin Institute of Geology and Mining,Fuzhou University,Fuzhou 350108,China)

机构地区：[1]福建省永正工程质量检测有限公司,福建福州350012 [2]福建江夏学院工程学院,福建福州350108 [3]福州大学紫金地质与矿业学院,福建福州350108

出　　处：《新型建筑材料》2024年第9期48-52,共5页New Building Materials

基　　金：福建省自然科学基金项目(2022J01963)。

摘　　要：选用无水Na_(2)SiO_(3)(简称W体系)、CaO+Na_(2)CO_(3)(摩尔比1∶1,简称C体系)和Na_(2)SO_(4)+普通硅酸盐水泥(质量比2∶1,简称Z体系)3种固态碱性激发剂制备碱矿渣流态固化土,研究水胶比和碱掺量对碱矿渣流态固化土流动性、无侧限抗压强度和微观结构的影响。结果表明:固化土的流动度随水胶比的增加而显著增大,其中,C体系碱掺量为10%,水胶比为0.9时,固化土的流动度可达204 mm,无离析现象,有利于泵送施工;碱掺量的增加会导致固化土的流动度下降,W体系影响最大;Z体系不具备抗压强度,只有C和W体系在10%碱掺量时才完整脱模并具有抗压强度;相较普通硅酸盐水泥,C和W体系具有低Ca/Si值,其C-S-H凝胶的聚合度更好,微观结构也越密实。CaO+Na_(2)CO_(3)(molar ratio 1∶1,called as C system),Na_(2)SO_(4)+ordinary silicate cement(mass ratio 2∶1,called as Z system)and anhydrous Na_(2)SiO_(3)(W system)were selected as solid alkali excitants to prepare alkali slag fluidized solidified soil,and to study the effects of water cement ratio and alkali dosing on the fluidity,unconfined compressive strength and microstructure of alkali slag fluidized solidified soil.The results show that:the fluidity of solidified soil increases significantly with the increase of water cement ratio,C10-0.9 can reach 204 mm with no segregation phenomenon,which is conducive to the pumping construction.The increase of alkali doping will lead to a decrease in the fluidity of the solidified soil,and the influence of the W system has the greatest change;the Z system does not have the compressive strength,and only the C and W systems have complete demolding and compressive strength at 10%alkali doping,compared with ordinary silicate cement,the C and W systems have a low Ca/Si value,and their C-S-H gels have a better degree of polymerization,resulting in a denser structure.

关 键 词：激发剂 流态固化土 碱矿渣水泥 流动度 抗压强度 微观结构 

分 类 号：TU526[建筑科学—建筑技术科学]