Effect of Rheology and Casting Method on Fiber Dispersion and Orientation of UHPC
HUANG Huanghuang1,2, TENG Le3,*, GAO Xiaojian4, LIU Zhengnan5
1 Hubei Longzhong Laboratory, Xiangyang 441000, Hubei, China 2 School of Materials Science and Engineering, Wuhan University of Technology, Wuhan 430070, China 3 School of Materials Science and Engineering, Southeast University, Nanjing 210000, China 4 School of Civil Engineering, Harbin Institute of Technology, Harbin 150090, China 5 School of Civil Engineering, Lanzhou Jiaotong University, Lanzhou 730070, China
Abstract: 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.
通讯作者:
* 滕乐,东南大学材料科学与工程学院博士后。2015年兰州交通大学土木工程专业本科毕业,2017年西南交通大学桥梁与隧道工程专业硕士毕业,2022年美国密苏里科技大学土木工程专业博士毕业。目前主要从事混凝土强韧化与外加剂技术等方面的研究工作。发表论文20余篇,包括 Cement and Concrete Research、Cement and Concrete Composites、Composites Part B: Engineering等。 101013637@seu.edu.cn
作者简介: 黄煌煌,武汉理工大学材料科学与工程学院讲师。分别于2016年、2021年在哈尔滨工业大学土木工程专业本科、博士毕业,目前在武汉理工大学材料科学与工程学院从事教学科研工作,主要研究方向为超高性能混凝土材料。发表论文20余篇,包括Cement and Concrete Research、Cement and Concrete Composites、Construction and Building Materials等。
引用本文:
黄煌煌, 滕乐, 高小建, 刘正楠. 流变与浇筑方式对UHPC纤维分散和取向的影响[J]. 材料导报, 2024, 38(24): 23100032-6.
HUANG Huanghuang, TENG Le, GAO Xiaojian, LIU Zhengnan. Effect of Rheology and Casting Method on Fiber Dispersion and Orientation of UHPC. Materials Reports, 2024, 38(24): 23100032-6.
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2024, Vol. 38 
