硅酸盐通报2024，Vol.43Issue(10)：3745-3754,10.
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
Mechanical Properties of Hybrid Fiber-Reinforced Recycled Coarse Aggregate Concrete Based on DIC Method
摘要
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.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Key words
hybrid fiber/recycled concrete/digital image correlation/full-field strain evolution/mechanical property分类
建筑与水利引用本文复制引用
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):3745-3754,10.基金项目
国家自然科学基金(11862023) （11862023）
云南省教育厅科学研究基金(2024Y602) （2024Y602）
