减水剂与钢纤维对超高性能混凝土流变及力学性能的影响

硅酸盐通报 ›› 2024, Vol. 43 ›› Issue (9): 3214-3223.

减水剂与钢纤维对超高性能混凝土流变及力学性能的影响

黄斌^1,2, 龚明子^1,2, 潘阿馨^1,2,3, 饶先鹏^1,2, 王涛^1,2, 陈晨^1,2, 黄伟³

1.中交绿建(厦门)科技有限公司,厦门 361000;
2.中交一公局厦门工程有限公司,厦门 361000;
3.福州大学土木工程学院,福州 350116)

收稿日期:2024-02-26 修订日期:2024-04-04 出版日期:2024-09-15 发布日期:2024-09-19
通信作者: 黄伟,博士,助理研究员。E-mail:WeiHuang@fzu.edu.cn
作者简介:黄斌(1976—),女,教授级高级工程师。主要从事道路工程材料的研究。E-mail:xmhuangbin@163.com
基金资助:
厦门市建设局建设科技项目(XJK2022-1-20);福建省交通运输厅交通运输科技项目(202268);福建省建设科技研究开发项目(2022-K-229,2022-K-294)

Influences of Water Reducing Agent and Steel Fiber on Rheological and Mechanical Properties of Ultra-High Performance Concrete

HUANG Bin^1,2, GONG Mingzi^1,2, PAN Axin^1,2,3, RAO Xianpeng^1,2, WANG Tao^1,2, CHEN Chen^1,2, HUANG Wei³

1. CCCC Green Construction (Xiamen) Technology Co., Ltd., Xiamen 361000, China;
2. CCCC First Highway Xiamen Engineering Co., Ltd., Xiamen 361000, China;
3. College of Civil Engineering, Fuzhou University, Fuzhou 350116, China)

Received:2024-02-26 Revised:2024-04-04 Published:2024-09-15 Online:2024-09-19

摘要/Abstract

摘要： 超高性能混凝土(UHPC)的工作性和力学强度是其推广应用的关键。因此,本文采用和易性试验、流变测试、抗压强度测试、抗折强度测试,探究不同减水剂掺量和纤维物理参数下UHPC扩展度、经时损失、屈服强度、塑性黏度以及抗压强度、抗折强度的变化规律。结果表明,UHPC的扩展度均随着减水剂掺量和纤维掺量的增加先增大后减小;UHPC的经时损失主要与静置时间相关,UHPC静置时间越长,经时损失越大;UHPC的流变曲线呈剪切增稠的趋势;随着减水剂的增加,UHPC的屈服应力和塑性黏度均呈先减小后增大的趋势,并且均在减水剂掺量为1.00%(质量分数)时获得最小值;减水剂对强度的影响并不明显,UHPC的抗压强度随着纤维掺量的增加而增加,抗折强度随着纤维掺量的增加先增大后减小,在纤维长度为13.0 mm时UHPC的抗压性能最优,在纤维长度为20.0 mm时UHPC的抗折性能最优。

关键词: 超高性能混凝土, 钢纤维, 扩展度, 经时损失, 流变性能, 力学性能

Abstract: The workability and mechanical strength of ultra-high performance concrete (UHPC) are the key to its popularization and application. Therefore, this paper used workability test, rheological test, compressive strength test and flexural strength test to explore the variation of UHPC fluidity, time loss, yield strength, plastic viscosity, compressive strength, and flexural strength under different water reducing agent content and fiber physical parameters. The results show that the fluidity of UHPC increases first and then decreases with the increase of water reducing agent content and fiber content. The time loss of UHPC is mainly related to standing time. The longer the standing time of UHPC is, the greater the time loss is. The rheological curve of UHPC shows a trend of shear thickening. With the increase of water reducing agent, the yield stress and plastic viscosity of UHPC decrease first and then increase, and the minimum value is obtained when the content of water reducing agent is 1.00% (mass fraction). The effect of water reducing agent on strength is not obvious. The compressive strength of UHPC increases with the increase of fiber content, and the flexural strength increases first and then decreases with the increase of fiber content. When the fiber length is 13.0 mm, the compressive performance of UHPC is the best, and the flexural performance is the best when the fiber length is 20.0 mm.

Key words: ultra-high performance concrete, steel fiber, fluidity, time loss, rheological property, mechanical property

中图分类号:

TU528

黄斌, 龚明子, 潘阿馨, 饶先鹏, 王涛, 陈晨, 黄伟. 减水剂与钢纤维对超高性能混凝土流变及力学性能的影响[J]. 硅酸盐通报, 2024, 43(9): 3214-3223.

HUANG Bin, GONG Mingzi, PAN Axin, RAO Xianpeng, WANG Tao, CHEN Chen, HUANG Wei. Influences of Water Reducing Agent and Steel Fiber on Rheological and Mechanical Properties of Ultra-High Performance Concrete[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2024, 43(9): 3214-3223.

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