钢-剑麻混杂纤维再生混凝土断裂性能研究

摘要/Abstract

摘要： 为改善再生混凝土(RAC)的断裂性能,通过三点弯曲断裂试验,研究了钢纤维、剑麻纤维及钢-剑麻混杂纤维对RAC试件断裂性能的影响。同时,采用数字图像相关(DIC)技术测得RAC试件的裂缝扩展全过程。结果表明:未掺纤维的RAC试件断裂性能较差,而掺入纤维后的RAC试件断裂性能明显提升;单掺钢纤维时,试件的起裂韧度与纤维掺量无关;单掺剑麻纤维时,最佳体积掺量为0.15%,其试件的起裂荷载较未掺纤维RAC试件提高了67%。单掺纤维和混掺纤维均可提高失稳韧度和断裂能,但混掺纤维效果更佳。当体积掺量为1.0%的钢纤维和体积掺量为0.30%的剑麻纤维混杂时,其起裂韧度、失稳韧度和断裂能较未掺纤维的RAC试件分别提高了83.92%、575.86%和1 244.05%。

关键词: 再生混凝土, 钢纤维, 剑麻纤维, 混杂纤维, 断裂性能, 数字图像相关

Abstract: To improve the fracture performance of recycled aggregate concrete (RAC), the effects of steel fiber, sisal fiber, and steel-sisal hybrid fiber on the fracture performance of RAC specimens were studied through three-point bending fracture tests. At the same time, digital image correlation (DIC) technology was used to measure the entire process of crack propagation in RAC specimens. The results show that the fracture performance of RAC specimens without fiber addition is poor, while the fracture performance of RAC specimens with fiber addition is significantly improved. When steel fiber is single doped, the cracking toughness is not related to fiber content. When sisal fiber is single doped, the optimal volume content is 0.15%, the initiation load of RAC specimen is 67% higher than that of RAC specimen without fiber addition. Both single doped and hybrid fiber can improve instability toughness and fracture energy, but hybrid fiber has a better effect. When steel fiber with a volume fraction of 1.0% and sisal fiber with a volume fraction of 0.30% are mixed,initiation toughness, unstable toughness and fracture energy of RAC specimens increase by 83.92%, 575.86%, and 1 244.05% compared with RAC specimen without fiber addition, respectively.

Key words: recycled aggregate concrete, steel fiber, sisal fiber, hybrid fiber, fracture performance, digital image correlation

中图分类号:

TU528

王二成, 李格格, 柴颖珂, 张红春, 李彦苍, 王燕杰. 钢-剑麻混杂纤维再生混凝土断裂性能研究[J]. 硅酸盐通报, 2023, 42(8): 2754-2763.

WANG Ercheng, LI Gege, CHAI Yingke, ZHANG Hongchun, LI Yancang, WANG Yanjie. Fracture Performance of Steel-Sisal Hybrid Fiber Recycled Aggregate Concrete[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2023, 42(8): 2754-2763.

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