基于DIC方法的混杂纤维增强再生粗骨料混凝土力学性能研究

摘要/Abstract

摘要： 为探究混杂纤维增强再生粗骨料混凝土(HFR-RCAC)的基本力学性能,以钢-聚丙烯混杂纤维(HF)体积掺量(0%、0.5%、1.0%)和再生粗骨料质量取代率(0%、25%、50%、75%、100%)为主要试验参数,共制备45组试件,进行抗压试验、劈裂抗拉试验和抗折试验,借助数字图像相关(DIC)方法对试件表面的全场位移和应变进行监测,并利用扫描电子显微镜(SEM)观察了聚丙烯纤维与再生粗骨料之间的界面过渡区的微观结构。结果表明,随着再生粗骨料替代率的增加,HFR-RCAC的力学性能有所下降,而掺入纤维可以弥补再生粗骨料带来的强度损失,显著提高其力学性能;通过DIC方法获取试件抗压破坏的全场应变演化,并基于最大主应变演化过程分析了试件表面宏、微观裂纹的动态演化特征,HF对混凝土的增强主要以阻碍宏观裂纹扩展的形式体现。利用SEM表征了聚丙烯纤维-水泥基体界面过渡区的微观结构变化,从微观角度解释了HFR-RCAC力学性能的变化以及纤维改性增强机理。

关键词: 混杂纤维, 再生混凝土, 数字图像相关, 全场应变演化, 力学性能

Abstract: To investigate the basic mechanical properties of hybrid fiber-reinforced recycled coarse aggregate concrete (HFR-RCAC), 45 sets of specimens were prepared for compressive, split tensile, and flexural tests, with the volume of steel-polypropylene hybrid fibers (HF) (0%, 0.5%, and 1.0%) and the mass substitution rate of recycled coarse aggregate (0%, 25%, 50%, 75%, and 100%) as the main test parameters. The full-field displacement and strain of specimen surfaces were monitored with the help of digital image correlation (DIC) method, and the microstructure of the interfacial transition zone between polypropylene fibers and recycled coarse aggregates was observed by scanning electron microscope (SEM). The test results show that the mechanical properties of HFR-RCAC decreases with the increase of the replacement rate of recycled coarse aggregate, and the incorporation of fibers can compensate for the loss of strength caused by the recycled coarse aggregate, which can significantly improve its mechanical properties. The full-field strain evolution of the compressive damage of specimen was obtained by DIC method, and the dynamic evolution characteristics of macro- and microscopic cracks on the surface of specimen were analyzed based on the evolutionary process of maximum principal strains, and the enhancement of concrete by HF is mainly manifested in the form of hindering the expansion of macro cracks. The microstructural changes in the transition zone of polypropylene fiber-cement matrix interface were characterized by SEM, which explains changes in the mechanical properties of HFR-RCAC as well as the fiber-modified reinforcing mechanism from a microscopic point of view.

Key words: hybrid fiber, recycled concrete, digital image correlation, full-field strain evolution, mechanical property

中图分类号:

TU528.2

虎积元, 盛冬发, 秦飞飞, 霍晓伟, 柴正一. 基于DIC方法的混杂纤维增强再生粗骨料混凝土力学性能研究[J]. 硅酸盐通报, 2024, 43(10): 3745-3754.

HU Jiyuan, SHENG Dongfa, QIN Feifei, HUO Xiaowei, CHAI Zhengyi. Mechanical Properties of Hybrid Fiber-Reinforced Recycled Coarse Aggregate Concrete Based on DIC Method[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2024, 43(10): 3745-3754.

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