动态荷载下聚乙烯醇纤维混凝土阻裂性能试验研究

doi:10.16552/j.cnki.issn1001-1625.2024.0794

硅酸盐通报 ›› 2025, Vol. 44 ›› Issue (1): 59-68.DOI: 10.16552/j.cnki.issn1001-1625.2024.0794

动态荷载下聚乙烯醇纤维混凝土阻裂性能试验研究

韩子默^1,2, 杨国梁¹, 李峰¹, 张志飞¹, 毕京九³, 赵康朴¹, 刘依^1,4

1.中国矿业大学(北京)力学与土木工程学院,北京 100083;
2.长江三峡技术经济发展有限公司武汉分公司,宜昌 443099;
3.北方爆破科技有限公司,北京 100089;
4.国能水务环保有限公司,北京 100089

收稿日期:2024-07-10 修订日期:2024-10-16 出版日期:2025-01-15 发布日期:2025-01-23
通信作者: 杨国梁,博士,副教授。E-mail:yanggl531@163.com
作者简介:韩子默(1997—),男,助理工程师。主要从事混凝土、岩石动力学的研究。E-mail:hanzm1101@163.com

Experimental Study on Cracking Resistance of Polyvinyl Alcohol Fiber Concrete under Dynamic Loading

HAN Zimo^{1, 2}, YANG Guoliang¹, LI Feng¹, ZHANG Zhifei¹, BI Jingjiu³, ZHAO Kangpu¹, LIU Yi^{1, 4}

1. School of Mechanics and Civil Engineering, China University of Mining and Technology (Beijing), Beijing 100083, China;
2. Wuhan Branch, Yangtze Three Gorges Technology and Economy Development Co., Ltd., Yichang 443099, China;
3. North Blasting Technology Co., Ltd., Beijing 100089, China;
4. China Energy Water Industry Environmental Protection Co., Ltd., Beijing 100089, China

Received:2024-07-10 Revised:2024-10-16 Published:2025-01-15 Online:2025-01-23

摘要/Abstract

摘要： 为探究动态荷载下纤维体积掺量对聚乙烯醇纤维水泥基复合材料阻裂性能的影响,利用分离式霍普金森压杆装置(SHPB)对5种纤维体积掺量(0%、0.75%、1.50%、2.25%、3.00%)下的中心切槽半圆盘弯曲(NSCB)试件开展冲击试验,结合高速摄影机记录的动态断裂过程,分析了材料的动态起裂韧度及能量耗散特征,并依据盒维数理论,计算了裂纹扩展路径分形维数。结果表明:随着纤维掺量增加,材料的动态起裂韧度呈先增大后减小的趋势,当纤维体积掺量为1.50%~2.25%时试件动态起裂韧度较高;当纤维掺量为0.75%~2.25%时,耗散能随纤维掺量的增加而增大,但随着纤维掺量进一步增加,总吸收能呈衰减趋势;在等速冲击下,当纤维掺量为2.25%时,材料破坏后的最终裂纹扩展路径分形维数最高,阻裂能力最优,当纤维掺量超过2.25%时,裂纹扩展路径分形维数呈下降趋势,纤维阻裂增益效果减弱。

关键词: PVA纤维, 工程水泥基复合材料, 起裂韧度, 分形维数, 能量耗散

Abstract: In order to investigate the effect of fiber volume content on the cracking resistance of polyvinyl alcohol fiber engineered cementitious composite (PVA-ECC) under dynamic loading, impact tests were carried out on the notched semi-circular bending (NSCB) specimen with five fiber volume content (0%, 0.75%, 1.50%, 2.25%, 3.00%) by separated Hopkinson pressure rod device (SHPB). Combined with the dynamic fracture process recorded by high speed camera, the dynamic cracking toughness and energy dissipation characteristics of material were analyzed, and the fractal dimension of cracking growth path was calculated according to the theory of box dimension. The results show that the dynamic cracking toughness of material increases first and then decreases with the increase of fiber volume content, and the dynamic cracking toughness is higher when the fiber volume content is in the range of 1.50% to 2.25%. The dissipative energy increases with the increase of fiber content in the range of 0.75% to 2.25%, but the total absorbed energy decreases with the increase of fiber content. Under constant velocity impact, the fractal dimension of final crack growth path after material failure is the highest when the fiber content is 2.25%, and the cracking resistance is best. When the fiber content is more than 2.25%, the fractal dimension of cracking growth path shows a downward trend, and the fiber cracking resistance gain effect decreases.

Key words: PVA fiber, engineered cementitious composite, cracking toughness, fractal dimension, energy dissipation

中图分类号:

TU528

韩子默, 杨国梁, 李峰, 张志飞, 毕京九, 赵康朴, 刘依. 动态荷载下聚乙烯醇纤维混凝土阻裂性能试验研究[J]. 硅酸盐通报, 2025, 44(1): 59-68.

HAN Zimo, YANG Guoliang, LI Feng, ZHANG Zhifei, BI Jingjiu, ZHAO Kangpu, LIU Yi. Experimental Study on Cracking Resistance of Polyvinyl Alcohol Fiber Concrete under Dynamic Loading[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2025, 44(1): 59-68.

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动态荷载下聚乙烯醇纤维混凝土阻裂性能试验研究

Experimental Study on Cracking Resistance of Polyvinyl Alcohol Fiber Concrete under Dynamic Loading

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