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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。
Abstract：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.
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基本信息:
DOI：10.14062/j.issn.0454-5648.20230370
中图分类号:TU528
引用信息:
[1]刘一帆,吴泽媚,张轩翰,等.超高性能混凝土流变特性及调控研究进展[J].硅酸盐学报,2023,51(11):3025-3038.DOI:10.14062/j.issn.0454-5648.20230370.
基金信息:
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)
2023-05-29
2023
2023-09-23
2023-09-20
2023
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2023-08-15
2023-08-15
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