摘要
通过研究环境温度、拌和水温度、预养护时间及外加剂对套筒灌浆料工作性和力学性能的影响,探索了常温套筒灌浆料在低温环境下性能变化的趋势,为利用硅酸盐水泥制备低温套筒灌浆料提供试验基础。试验结果表明:常温套筒灌浆料不适宜用于低于5℃的温度环境;低温时,升高拌和水温度有助于提高灌浆料的早期强度,但处于负温时,灌浆料强度发展缓慢;预养护有助于提高低温时套筒灌浆料的早期强度;适量掺加防冻剂和早强剂可以提高套筒灌浆料早期强度,流动度随其掺量的增加而逐渐下降。综合考虑,4种外加剂中亚硝酸钠效果最好,其合理掺量为2.0%,碳酸锂效果最差。对于硅酸盐水泥基套筒灌浆料,在负温时难以通过单掺外加剂来获得较高的早期强度。
By studying the influence of ambient temperature,mixing water temperature,pre curing time and additives on the workability and mechanical properties of cementitious grout for sleeve,the performance change trend of normal temperature type cementitious grout for sleeve in low temperature environment is explored,which provides experimental basis for the preparation of low temperature type cementitious grout for sleeve with Portland cement.The test results show that the normal temperature type cementitious grout for sleeve is not suitable for the temperature environment below 5 ℃.At low temperature,increasing the mixing water temperature is helpful to improve the early strength of cementitious grout for sleeve,but at negative temperature,the strength develops slowly.The pre curing system is helpful to improve the early strength of cementitious grout for sleeve at low temperature.The early strength of cementitious grout for sleeve can be improved by adding antifreeze and early strength agent,and the fluidity gradually decreases with the increase of its content.Comprehensive consideration,the sodium nitrite effect is the best in the four kinds of additives,its reasonable content is 2.0%,lithium carbonate effect is the worst.For Portland cement-based cementitious grout for sleeve,it is difficult to obtain higher early strength by adding only admixtures at negative temperature.
作者
孙小巍
刘星靖
杨海明
曲佳成
张勇平
胡曼曼
SUN Xiaowei;LIU Xingjing;YANG Haiming;QU Jiacheng;ZHANG Yongping;HU Manman(College of Materials Science and Engineering,Shenyang Jianzhu University,Shenyang 110168,China;College of Architecture and Environment,Sichuan University,Chengdu 610065,China;Zhejiang Building Materials Group Co.,Ltd.,Hangzhou 310011,China)
出处
《混凝土》
CAS
北大核心
2021年第2期146-150,共5页
Concrete
基金
辽宁省教育厅一般项目(lnjc201916)
辽宁省科技厅指导计划项目(2019-ZD-0669)
辽宁省大学生创新创业项目(D202006281813388831)。
关键词
套筒灌浆料
低温
抗压强度
流动度
cementitious grout for sleeve
low temperature
compressive strength
fluidity
作者简介
第一作者:孙小巍(1979-),男,高级试验师,硕士研究生导师,主要从事水泥基复合材料的研究。联系地址:辽宁省沈阳市浑南区浑南中路25号沈阳建筑大学材料科学与工程学院(110168)联系电话:13998893416;通讯作者:胡曼曼(1994-),女,硕士研究生。联系电话:18840651342。
