超高性能混凝土流变特性及调控研究进展  

Rheological Properties and Their Regulation of Ultra-High Performance Concrete-A Short Review

作　　者：刘一帆 吴泽媚 张轩翰 史才军 LIU Yifan;WU Zemei;ZHANG Xuanhan;SHI Caijun(Key Laboratory for Green&Advanced Civil Engineering Materials and Application Technologies of Hunan Province,College of Civil Engineering,Hunan University,Changsha 410082,China;International Science and Technology Innovation Center for Green&Advanced Civil Engineering Materials of Hunan Province,Changsha 410082,China)

机构地区：[1]湖南大学土木工程学院,绿色先进土木工程材料及应用技术湖南省重点实验室,长沙410082 [2]湖南省绿色先进土木工程材料国际科技创新合作基地,长沙410082

出　　处：《硅酸盐学报》2023年第11期3025-3038,共14页Journal of The Chinese Ceramic Society

基　　金：国家重点研发计划项目(2022YFB3708700);国家自然科学基金青年基金项目(52008164);湖南省自然科学基金面上项目(2022JJ30144)。

摘　　要：超高性能混凝土(UHPC)是一种具有超高强度、高韧性和优异耐久性的新型水泥基复合材料。由于它的水胶比低、细颗粒用量大,导致新拌浆体黏度高、纤维易成团、泵送困难等问题,不利于混凝土的匀质性及纤维对UHPC增强增韧作用的发挥。本文从流变表征和模型层面综述了UHPC的流变特性,基于水胶比、外加剂、矿物掺合料、纤维及骨料特性等因素对UHPC流变性能的影响,讨论分析了UHPC流变行为调控技术,包括调控水膜层厚度、调控浆膜层厚度、降低间隙液黏度、掺入黏度调节外加剂、改变纤维特性等5个方面及其调控作用机理。Ultra-high performance concrete(UHPC)is a new cement-based composite material with ultra-high strength,high toughness,and excellent durability.Low water-to-binder ratio and large amount of fine particles in UHPC lead to some problems like high viscosity of fresh paste,fiber cluster issue,and difficulty in pumping,etc..This is not beneficial to the homogeneity of concrete and fiber strengthening and toughening of UHPC,and restricts the in-situ placing and application of UHPC.This review represented the rheological properties of UHPC from aspects of rheological parameters and models.Based on the influence of water-to-binder ratio,chemical admixtures,mineral admixtures,fiber and aggregate characteristics on the rheological properties of UHPC,the techniques in regulating the rheological behavior of UHPC were analyzed.Such techniques include regulating water film thickness,regulating paste film thickness,reducing viscosity of interstitial fluid,adding viscosity modifier,and changing fiber characteristics.In addition,the rheology regulation mechanisms associated with these techniques were also discussed.

关 键 词：超高性能混凝土 流变性能 调控技术 纤维分散与取向 力学性能 

分 类 号：TU528.31[建筑科学—建筑技术科学]