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Relationship between autogenous shrinkage and resistivity of cement mortar internal cured with low active slag
- Journal of Civil and Environmental Engineering Vol. 45, Issue 6, Pages: 173-179(2023)
- 作者机构：
新疆农业大学 水利与土木工程学院
新疆水利工程安全与水灾害防治重点实验室，乌鲁木齐 830052
- 作者简介：
DU Yuhui (1996- ), main research interest: high performance concrete, E-mail: 2609651039@qq.com.
LI Shuangxi associate professor, E-mail: xjlsx123@126.com.
- 基金信息：Natural Science Foundation of Xinjiang(2019D01A46);Graduate Research Innovation Project of Autonomous Region of 2021(XJ2021G163)
DOI：10.11835/j.issn.2096-6717.2021.238
CLC： TU525.9Received：07 July 2021，
Published：25 December 2023
- 稿件说明：
移动端阅览
杜玉会,李双喜.低活性矿渣内养护水泥砂浆自收缩与电阻率的关系[J].土木与环境工程学报,2023,45(06):173-179.
DU Yuhui,LI Shuangxi.Relationship between autogenous shrinkage and resistivity of cement mortar internal cured with low active slag[J].Journal of Civil and Environmental Engineering,2023,45(06):173-179.
杜玉会,李双喜.低活性矿渣内养护水泥砂浆自收缩与电阻率的关系[J].土木与环境工程学报,2023,45(06):173-179. DOI： 10.11835/j.issn.2096-6717.2021.238.
DU Yuhui,LI Shuangxi.Relationship between autogenous shrinkage and resistivity of cement mortar internal cured with low active slag[J].Journal of Civil and Environmental Engineering,2023,45(06):173-179. DOI： 10.11835/j.issn.2096-6717.2021.238.
摘要
以预吸水低活性矿渣替代细集料作为内养护材料，研究低活性矿渣内养护砂浆自收缩与电阻率的变化规律，揭示两者的关系。结果表明：随着低活性矿渣掺量的增加，砂浆早期强度降低幅度大，随着龄期的延长，砂浆中后期强度降低幅度小于早期，建议低活性矿渣的合适掺量取为细集料质量的15%~25%；低活性矿渣内养护对砂浆电阻率发展影响明显，凝结硬化前，浆体电阻率随低活性矿渣掺量的增大而增大；凝结硬化后，浆体电阻率随低活性矿渣掺量的增大而减小；低活性矿渣内养护能有效抑制浆体各阶段的自收缩，尤其在快速收缩阶段和短暂膨胀阶段作用最为明显，同时，36 h龄期后电阻率与自收缩有很好的对应关系，可通过电阻率发展趋势预测自收缩的变化情况。
Abstract
Using pre-absorbent low active slag as internal curing material instead of fine aggregate
the autogenous shrinkage and resistivity variation of low active slag internal curing mortar were studied
and the relationship between them was revealed. The results show that with increase of low active slag content
the early strength of mortar decreases greatly
with the extension of age
the strength reduction in the middle and late stages of mortar is smaller than that in the early stage. It is suggested that the appropriate content of low-activity slag is 15%-25% of the fine aggregate quality. The internal curing of low active slag has obvious influence on the resistivity development of mortar. Before setting hardening
the resistivity of mortar increases with the increase of low active slag content. After it
the slurry resistivity decreases with the increase of low active slag content. The internal curing of low active slag can effectively inhibit the autogenous shrinkage at various stages of the slurry
especially in the rapid shrinkage stage and transient expansion stage. At the same time
the resistivity after 36 h has a good correlation with autogenous shrinkage
and the change of autogenous shrinkage can be predicted by the development trend of resistivity.
关键词
Keywords
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