轴压下含裂隙聚丙烯纤维混凝土裂纹扩展及损伤演化研究

硅酸盐通报 ›› 2024, Vol. 43 ›› Issue (7): 2404-2414.

所属专题：水泥混凝土

轴压下含裂隙聚丙烯纤维混凝土裂纹扩展及损伤演化研究

汪学清^1,2, 李永超¹, 张雪瑞¹, 赵云猛¹, 姜雨枫¹

1.中国矿业大学(北京)力学与土木工程学院,北京 100083;
2.深海矿产资源开发利用技术国家重点实验室,长沙 410012

收稿日期:2023-12-29 修订日期:2024-02-29 出版日期:2024-07-15 发布日期:2024-07-24
通信作者: 李永超,硕士研究生。E-mail:liyongchao2021@163.com
作者简介:汪学清(1971—),男,博士,副教授。主要从事岩土工程、建筑材料方向的研究。E-mail:wxqease@163.com
基金资助:
深海环境海洋矿物破碎的混沌和失稳分析国家重点实验室开放课题(2021-HYSDDYB-001);中国五矿集团科技专项(2019ZXA02)

Crack Propagation and Damage Evolution in Polypropylene Fiber Reinforced Concrete with Cracks under Axis Compression

WANG Xueqing^1,2, LI Yongchao¹, ZHANG Xuerui¹, ZHAO Yunmeng¹, JIANG Yufeng¹

1. School of Mechanics and Civil Engineering, China University of Mining and Technology (Beijing), Beijing 100083, China;
2. State Key Laboratory of Deep Sea Mineral Resources Development and Utilization Technology, Changsha 410012, China

Received:2023-12-29 Revised:2024-02-29 Online:2024-07-15 Published:2024-07-24

摘要/Abstract

摘要： 为研究聚丙烯纤维(PPF)掺量和预制裂隙角度对混凝土在受压作用下的裂纹扩展、破坏形式的影响,对含不同裂隙角度的素混凝土和聚丙烯纤维混凝土(PFRC)进行了单轴压缩试验,并采用声发射(AE)监测系统对其内部损伤过程进行了采集,分析了试件破坏形态和AE定位图,探究了PPF掺量、预制裂隙角度与应力-应变曲线、AE参数等指标之间的联系。研究表明,随着PPF掺量增加,试件产生裂纹的数量和扩展范围先减小后增大,峰值应力先增大后减小,其破坏形式由拉伸破坏转变为拉剪或剪切破坏,其中PPF的作用机理表现为当其掺量适宜的情况下可在基体内部起到较好的桥接作用,而当过量时则易成团出现,导致内部薄弱面增加,表明PPF对混凝土的增强效果存在正负两种影响;随着预制裂隙角度增大,峰值应力呈先下降后上升的趋势,其中倾斜非水平角度预制裂隙与高掺量PPF之间存在一定的协同效应,并发现几类对试件抗压强度和PPF掺量变化表现敏感的预制裂隙角度;最后分析AE数据发现PPF的掺入使AE定位图的定位点数量变多、分布变杂,AE信号从开始出现至到达峰值的活跃时间随PPF掺量增加而延长,表明PPF对混凝土起到了阻裂增韧的效果。

关键词: 聚丙烯纤维, 预制裂隙, 裂纹扩展, 声发射, 损伤演化

Abstract: To investigate the effects of polypropylene fiber (PPF) content and prefabricated crack angle on the crack propagation and failure mode of concrete under compression, uniaxial compression tests were conducted on plain concrete and polypropylene fiber concrete (PFRC) with different crack angles. The internal damage process was collected using an acoustic emission (AE) monitoring system, and the failure mode and AE localization map of specimens were analyzed. The relationship between PPF content, prefabricated crack angle, stress-strain curve, AE parameters and other indicators was explored. Research has shown that as the content of PPF increases, the number and propagation range of cracks in specimen decrease first and then increase, and the peak stress increases first and then decreases. Its failure mode changes from tensile failure to tensile shear or shear failure. The mechanism of PPF is that when the content is appropriate, it can play a good bridging role inside the matrix, while when it is excessive, it is easy to form clusters, leading to an increase in internal weak surfaces, indicating that PPF has positive and negative effects on the reinforcement effect of concrete. As the angle of prefabricated cracks increases, the peak stress shows a trend of decreasing first and then increasing. Among them, there is a certain synergistic effect between inclined non horizontal angle prefabricated cracks and high content PPF, and several types of prefabricated crack angles that are sensitive to changes in compressive strength and PPF content of the specimens are found. Finally, analyzing the AE data, it is found that the addition of PPF increases the number and distribution of positioning points in the AE localization map. The activity time of AE signals from the beginning to the peak is prolonged with the increase of PPF content, indicating that PPF has a crack resistance and toughening effect on concrete.

Key words: polypropylene fiber, prefabricated crack, crack propagation, acoustic emission, damage evolution

中图分类号:

TU528.041

汪学清, 李永超, 张雪瑞, 赵云猛, 姜雨枫. 轴压下含裂隙聚丙烯纤维混凝土裂纹扩展及损伤演化研究[J]. 硅酸盐通报, 2024, 43(7): 2404-2414.

WANG Xueqing, LI Yongchao, ZHANG Xuerui, ZHAO Yunmeng, JIANG Yufeng. Crack Propagation and Damage Evolution in Polypropylene Fiber Reinforced Concrete with Cracks under Axis Compression[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2024, 43(7): 2404-2414.

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轴压下含裂隙聚丙烯纤维混凝土裂纹扩展及损伤演化研究

Crack Propagation and Damage Evolution in Polypropylene Fiber Reinforced Concrete with Cracks under Axis Compression

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