流变与浇筑方式对UHPC纤维分散和取向的影响  

Effect of Rheology and Casting Method on Fiber Dispersion and Orientation of UHPC

作　　者：黄煌煌 滕乐 高小建[4] 刘正楠[5] HUANG Huanghuang;TENG Le;GAO Xiaojian;LIU Zhengnan(Hubei Longzhong Laboratory,Xiangyang 441000,Hubei,China;School of Materials Science and Engineering,Wuhan University of Technology,Wuhan 430070,China;School of Materials Science and Engineering,Southeast University,Nanjing 210000,China;School of Civil Engineering,Harbin Institute of Technology,Harbin 150090,China;School of Civil Engineering,Lanzhou Jiaotong University,Lanzhou 730070,China)

机构地区：[1]湖北隆中实验室,湖北襄阳441000 [2]武汉理工大学材料科学与工程学院,武汉430070 [3]东南大学材料科学与工程学院,南京210000 [4]哈尔滨工业大学土木工程学院,哈尔滨150090 [5]兰州交通大学土木工程学院,兰州730070

出　　处：《材料导报》2024年第24期136-141,共6页Materials Reports

基　　金：国家自然科学基金(52202027);湖北隆中实验室自主创新研究项目(2022ZZ-37);武汉理工大学自主创新研究基金(WUT:2022IVA176)。

摘　　要：本工作研究了浆体流变与浇筑方式对超高性能混凝土(UHPC)纤维分散和取向的影响。结果表明,对于流动度为(200±10)mm的可流动UHPC,塑性黏度提高时,传统浇筑、30°斜槽、流动诱导三种浇筑方式得到的纤维分散系数与纤维取向系数均降低;而对于流动度为(270±10)mm的自密实UHPC,塑性黏度提高可使纤维分散系数提高25%~43%,30°斜槽与流动诱导两种浇筑方式可使纤维取向系数提高20%。给定流动度与塑性黏度时,流动诱导浇筑得到的抗弯强度和韧性最高,30°斜槽浇筑的次之,传统浇筑方法最低;随塑性黏度提高,流动诱导浇筑可使UHPC试件的抗弯强度和韧性分别提升55%和70%。This work investigated the effect of suspending mortar rheology and casting method on fiber dispersion and orientation of UHPC.The test results showed that the fiber dispersion coefficient and fiber orientation coefficient decreased with the increase of plastic viscosity for flowable UHPC with(200±10)mm mini-slump flow and prepared by conventional,30°chute,and flow-induced casting methods.On the other hand,the fiber dispersion coefficient was increase by 25%—43%with the increase of plastic viscosity for self-consolidating UHPC with(270±10)mm mini-slump flow.The increase ratio for fiber orientation coefficient was 20%when 30°chute and flow-induced casting methods were used.For a given mini-slump flow and plastic viscosity,UHPC prepared by flow-induced casting method showed the greatest flexural strength and toughness,followed by 30°chute,while the conventional casting methods led to the lowest flexural strength and toughness.With the increase of plastic viscosity,flexural strength and toughness of UHPC casted by flow-induced method can be enhanced by 55%and 70%,respectively.

关 键 词：UHPC 流变特性 浇筑方式 纤维分散 纤维取向 抗弯性能 

分 类 号：TU528.01[建筑科学—建筑技术科学]