冻融作用后超高性能混凝土中钢纤维的拔出行为研究

doi:10.11901/1005.3093.2020.225

材料研究学报

2021, Vol. 35

Issue (6): 433-440 DOI: 10.11901/1005.3093.2020.225

研究论文

本期目录 | 过刊浏览

冻融作用后超高性能混凝土中钢纤维的拔出行为研究

谢瑞峰¹^,², 仵云飞²(

), 唐百晓³

^1.上海交通大学船舶海洋与建筑工程学院上海 200240
^2.湖州职业技术学院湖州 313099
^3.安康学院经济管理学院安康 725000

Pullout Behavior of Steel Fiber in Ultra-high-performance Concrete Subjected to Freeze-thaw

XIE Ruifeng¹^,², WU Yunfei²(

), TANG Baixiao³

^1.School of Naval Architecture, Ocean and Civil Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
^2.Civil Engineering College, Huzhou Vacational and Technical College, Huzhou 313099, China
^3.School of Economics & Management, Ankang University, Ankang 725000, China

引用本文:

谢瑞峰, 仵云飞, 唐百晓. 冻融作用后超高性能混凝土中钢纤维的拔出行为研究[J]. 材料研究学报, 2021, 35(6): 433-440.
Ruifeng XIE, Yunfei WU, Baixiao TANG. Pullout Behavior of Steel Fiber in Ultra-high-performance Concrete Subjected to Freeze-thaw[J]. Chinese Journal of Materials Research, 2021, 35(6): 433-440.

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摘要:

将超高性能混凝土冻融0~1500次后进行钢纤维的拔出实验和纳米压痕实验，研究了倾斜角度和埋置深度对钢纤维拔出行为的影响。结果表明，不同倾角和埋深的钢纤维其拔出荷载峰值都随着冻融次数的增加而逐渐降低，倾角为50°时拔出荷载峰值达到最大值；钢纤维-水泥浆体界面过渡区中的微孔洞逐渐增多和汇聚，过渡区的厚度由20 μm 增加到65 μm；钢纤维与过渡区组成相的微观力学性能的降低较小。过渡区的宏观有效弹性模量随着冻融次数的增加而降低，冻融600次后降低的幅度增大。过渡区的微观结构和宏观力学性能劣化，是钢纤维粘结性能降低的主要原因。

关键词 ：无机非金属材料, 钢纤维拔出行为, 纳米压痕测试, 粘结性能, 微观结构, 力学性能

Abstract：

The effect of inclined angle and embedment depth on the pull-out behavior of single fiber within ultra-high-performance concrete subjected to 0~1500 freeze-thaw (F-T) cycles were investigated by pull-out test and nano-indentation meter. The results show that the peak values of pull-out load of steel fiber with different inclination angle and embedment depth decrease with the increasing freeze-thaw cycles, and reach the maximum value at 50° inclination angle. The micropores in the interface transition zone (ITZ) of steel fiber-cement paste gradually increase and converge, correspondingly, the thickness of ITZ increases from 20 μm to 65 μm. The mechanical properties of the local area composed of steel fiber and its surrounding component phases in ITZ decrease little. The macro effective elastic modulus of ITZ decreases with the increasing freeze-thaw cycles, and the decrease range is greater after 600 F-T cycles. The degradation of microstructure and macro mechanical properties of ITZ is the main reason for the decrease of bonding properties of the steel fiber.

Key words： inorganic non-metallic materials steel fiber pull-out behavior nanoindentation test bond properties microstructure mechanical properties

收稿日期: 2020-06-11

ZTFLH:

TU528.58

基金资助:国家自然科学基金(51679136);安康学院高水平项目专项资金(2016AYPYZX13);陕西省教育专项资金(18JK0018)

作者简介: 谢瑞峰，男，1984年生，博士

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https://www.cjmr.org/CN/10.11901/1005.3093.2020.225 或 https://www.cjmr.org/CN/Y2021/V35/I6/433

表1 UHPC的配合比

图1 不同次数冻融循环作用下倾斜钢纤维的拔出荷载-位移曲线

图2 不同倾角的钢纤维拔出荷载的变化

图3 冻融循环作用不同埋深的钢纤维的拔出荷载-滑移曲线

图4 不同埋深的钢纤维拔出荷载的变化

图5 钢纤维表面和界面过渡区表面的纳米压痕阵列

图6 冻融循环作用下界面过渡区弹性模量的分布云图

F-T cycles	0	300	600	900	1200	1500
$E h o m$ /GPa	26.32	26.20	25.41	24.19	22.72	20.53

表2 冻融循环作用下界面过渡区的宏观有效弹性模量

图7 钢纤维、界面过渡区微观组成相的相对模量和宏观有效弹性模量的变化

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