高性能水泥基灌浆料的制备及性能研究  

Study on Preparation and Properties of High Performance Cement⁃based Grout

作　　者：李崇智 王坤 王琬怡 彭家蔓 王会新 张晓刚 LI Chongzhi;WANG Kun;WANG Wanyi;PENG Jiaman;WANG Huixin;ZHANG Xiaogang(School of Civil and Transportation Engineering,Beijing University of Civil Engineering and Architecture,Beijing 100044,China;China Railway Construction Group Architectural Development Co.,Ltd,Beijing 100040,China)

机构地区：[1]北京建筑大学土木与交通工程学院,北京100044 [2]中铁建设集团建筑发展有限公司,北京100040

出　　处：《材料导报》2023年第S02期227-231,共5页Materials Reports

基　　金：国家自然科学基金(52278237,52378003)。

摘　　要：针对传统水泥基灌浆料凝结时间长、流动度经时损失大、早期强度低的问题,采用硫铝酸盐水泥-硅灰-微珠三元复合体系,研究聚羧酸减水剂、碳酸锂、硼酸对灌浆料性能的影响,制得高流态、早高强、低收缩微膨胀等特性的高性能水泥基灌浆料。结果表明:采用水胶比为0.32、胶砂比为1、聚羧酸减水剂掺量为0.3%制备的硫铝酸盐水泥基灌浆料,其初始流动度及30 min保留值分别为410 mm、375 mm,0.5 h的扩展度损失较小;早强剂碳酸锂掺0.1%时,3 h、1 d、3 d的抗压强度达到31.8 MPa、59.8 MPa、68.6 MPa;硼酸作为缓凝剂掺量为0.3%,灌浆料的初、终凝时间分别为33 min、42 min,3 h竖向膨胀率达到0.13%、3 h与24 h的竖向膨胀率之差为0.04%;以上性能参数均满足《水泥基灌浆材料应用技术规范》(GB/T 50448—2015)中Ⅱ类灌浆料的要求。In view of the problems of long setting time,large loss of fluidity and low early strength of traditional cement⁃based grout,the effect of polycarboxylic acid water reducing agent,lithium carbonate and boric acid on the properties of grout was studied by using the ternary compound system of sulphoaluminate cementary⁃silica fume and microbeads.The results show that the initial fluidity and 30 min retention value of sulfoaluminate cement based grout prepared with water⁃binder ratio of 0.32,cement⁃sand ratio of 1 and polycarboxylic acid superplasticizer content of 0.3%are 410 mm and 375 mm,respectively,and the loss of expansibility in half an hour is small.When the early strength agent lithium carbonate was added with 0.1%,the compressive strength of 3 h,1 d and 3 d reached 31.8 MPa,59.8 MPa and 68.6 MPa.With 0.3%boric acid as retarder,the initial and final setting time of the grout were 33 min and 42 min respectively,and the vertical expansion rate reached 0.13%at 3 h,and the difference between 3 h and 24 h was 0.04%.The above performance parameters meet the requirements of Class II grouting materials in‘Technical Specification for Application of Cement⁃based Grouting Materials’(GB/T 50448⁃2015).

关 键 词：高性能 水泥基灌浆料 工作性 早期强度 竖向膨胀率 

分 类 号：TU528[建筑科学—建筑技术科学]