冬季施工外加剂对混凝土流变性的影响研究进展  

Review on effects of chemical admixtures for winter construction on rheological properties of concrete mixtures

作　　者：范小虎 张俊逸 王立志 尹贺军 潘铭 白魁武 高小建[2] FAN Xiaohu;ZHANG Junyi;WANG Lizhi;YIN Hejun;PAN Ming;BAI Kuiwu;GAO Xiaojian(China Construction Seventh Engineering Division Co.,Ltd.,Zhengzhou 450004,China;School of Civil Engineering,Harbin Institute of Technology,Harbin 150090,China;Shaanxi Tongzhining New Materials Co.,Ltd.,Xi′an 710301,China)

机构地区：[1]中国建筑第七工程局有限公司,河南郑州450004 [2]哈尔滨工业大学土木工程学院,黑龙江哈尔滨150090 [3]陕西砼之凝新材料有限公司,陕西西安710301

出　　处：《混凝土》2025年第3期121-127,共7页Concrete

基　　金：中建七局科技研发课题“严寒环境高性能混凝土U型梁智慧制造关键技术研究”;黑龙江省重点研发计划知道类项目(GZ20220169)。

摘　　要：为了保证混凝土冬季施工质量,国内外常采用减水剂、防冻剂、引气剂、触变剂等外加剂改善混凝土早期性能和耐久性.在分析比较常用冬季施工外加剂对新拌混凝土流变学行为的作用规律和机理,进而为实现寒区混凝土的成功制备及其工作性能优化提供参考.减水剂对流变性的影响机制主要与吸附和分散作用有关,掺入后大幅降低屈服应力;引气剂对流变性的影响机制包括了滚珠润滑效应和颗粒桥接效应两个方面,掺入后显著降低塑性黏度;防冻剂会加速流变参数的经时增长;触变剂能够大幅提高静态屈服应力,有效解决由低温环境导致混合料稳定性差的问题.因此,上述外加剂的合理复合使用可以实现对冬季施工混凝土流变参数的精细化调控。To ensure the concrete quality during winter construction,superplasticizer(SP),anti-freezing agent(AFA),air-entraining agent(AEA),and thixotropy-modifying agent(TMA)are often adopted worldwide to improve its early-age performance and durability.It aims to analyze and compare the effects and action mechanisms of these chemical admixtures on rheological behavior of fresh concrete for winter construction,and thus support the successful preparation and workability enhancement of concrete mixtures in cold regions.The influence mechanism of SP on rheological properties mainly relates to the adsorption-dispersion effects,and the use of SP substantially reduces the yield stress.The influence of AEA on rheological properties includes two aspects:ball lubrication and grains bridging effects of air bubbles,and the incorporation of AEA reduces plastic viscosity.AFA can accelerate time-dependent growth of rheological parameters.TMA can significantly enhance the static yield stress and solve the problem of mixtures instability caused by low-temperature environment.So,the compound use of these additives can realize an elaborate control of rheological parameters for fresh concrete mixture in winter construction.

关 键 词：新拌混凝土 流变性 外加剂 冬季施工 作用机理 

分 类 号：TU528.042[建筑科学—建筑技术科学]