碳纤维再生混凝土循环受压性能及本构关系研究

硅酸盐通报 ›› 2023, Vol. 42 ›› Issue (8): 2743-2753.

碳纤维再生混凝土循环受压性能及本构关系研究

吴辉琴^1,2, 刘星池¹, 陈宇良^1,2

1.广西科技大学土木建筑工程学院,柳州 545006;
2.广西高校防灾减灾与预应力技术重点实验室,柳州 545006

收稿日期:2023-03-28 修订日期:2023-04-17 发布日期:2023-08-18
通信作者: 陈宇良,博士,副教授。E-mail:ylchen@gxust.edu.cn
作者简介:吴辉琴(1965—),女,教授。主要从事新型建筑材料方面的研究。E-mail:whq6329@163.com
基金资助:
中国博士后科学基金(2021M693854);广西自然科学基金(2019GXNSFBA245071);广西科技大学博士基金项目(校科博18Z09);广西科技大学研究生教育创新计划(GKYC202231)

Cyclic Compression Performance and Constitutive Relationship of Carbon Fiber Recycled Aggregate Concrete

WU Huiqin^1,2, LIU Xingchi¹, CHEN Yuliang^1,2

1. College of Civil and Architecture Engineering, Guangxi University of Science and Technology, Liuzhou 545006, China;
2. Key Laboratory of Disaster Prevention & Mitigation and Prestress Technology of Guangxi Colleges and Universities, Liuzhou 545006, China

Received:2023-03-28 Revised:2023-04-17 Published:2023-08-18

摘要/Abstract

摘要： 为了研究循环荷载下碳纤维再生混凝土(CFRAC)的受压性能,以再生粗骨料取代率、碳纤维体积掺量和加载速率作为变化参数,设计并制作了40个圆柱体试件进行循环受压加载试验。试验观察了试件的破坏形态,获取了应力-应变曲线,分析了不同变化参数对峰值应力、峰值应变、塑性应变、刚度退化和应力退化等性能的影响规律。结果表明:碳纤维再生混凝土试件在循环荷载作用下主要发生脆性破坏;碳纤维改善了再生混凝土的循环受压性能,与未掺碳纤维混凝土相比,当碳纤维体积掺量为0.3%时,峰值应力和峰值应变分别提高了11.33%和12.22%;刚度退化与应力退化程度得到降低;当再生粗骨料取代率为100%时,峰值应力和峰值应变分别提高了10.16%和14.29%;最后,提出了碳纤维再生混凝土在循环受压下应力-应变本构方程。

关键词: 碳纤维, 再生混凝土, 循环受压试验, 刚度退化, 应力-应变关系

Abstract: In order to study the compressive behavior of carbon fiber recycled aggregate concrete (CFRAC) under cyclic loading, 40 cylindrical specimens were designed and fabricated for cyclic loading test with recycled coarse aggregate replacement rate, carbon fiber volume content and loading rate as variation parameters. The test observed the failure mode of the specimen, obtained the stress-strain curve, and analyzed the influences of different variation parameters on the mechanical behaviors such as peak stress, peak strain, plastic strain, stiffness degradation and stress degradation. The results show that the carbon fiber recycled aggregate concrete specimens mainly undergo oblique splitting failure under cyclic loading. The incorporation of carbon fiber improves the cyclic compression performance of recycled aggregate concrete. Compared with unmixed carbon fiber concrete, when the volume content of carbon fiber is 0.3%, the peak stress and peak strain increase by 11.33% and 12.22%, respectively. The degree of stiffness degradation and stress degradation is reduced. When the replacement rate of recycled coarse aggregate is 100%, the peak stress and peak strain increase by 10.16% and 14.29%, respectively. Finally, the stress-strain constitutive equation of carbon fiber recycled aggregate concrete under cyclic compression is proposed.

Key words: carbon fiber, recycled aggregate concrete, cyclic compression test, stiffness degradation, stress-strain relationship

中图分类号:

TU528.572

吴辉琴, 刘星池, 陈宇良. 碳纤维再生混凝土循环受压性能及本构关系研究[J]. 硅酸盐通报, 2023, 42(8): 2743-2753.

WU Huiqin, LIU Xingchi, CHEN Yuliang. Cyclic Compression Performance and Constitutive Relationship of Carbon Fiber Recycled Aggregate Concrete[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2023, 42(8): 2743-2753.

参考文献

[1] KIM J. Influence of quality of recycled aggregates on the mechanical properties of recycled aggregate concretes: an overview[J]. Construction and Building Materials, 2022, 328: 127071.
[2] 孙冰, 肖茁良, 陈露辉, 等. 再生混凝土力学性能研究进展[J]. 硅酸盐通报, 2017, 36(2): 497-502.
SUN B, XIAO Z L, CHEN L H, et al. Research progress on mechanical properties of recycled concrete[J]. Bulletin of the Chinese Ceramic Society, 2017, 36(2): 497-502 (in Chinese).
[3] 陈鹏博, 李北星, 殷实, 等. 同掺再生粗细骨料混凝土的力学与耐久性能研究[J]. 硅酸盐通报, 2022, 41(12): 4300-4309.
CHEN P B, LI B X, YIN S, et al. Mechanical and durability properties of concrete with simultaneous incorporation of coarse and fine recycled aggregates[J]. Bulletin of the Chinese Ceramic Society, 2022, 41(12): 4300-4309 (in Chinese).
[4] 徐礼华, 黄彪, 李彪, 等. 循环荷载作用下聚丙烯纤维混凝土受压应力-应变关系研究[J]. 土木工程学报, 2019, 52(4): 1-12.
XU L H, HUANG B, LI B, et al. Study on the stress-strain relation of polypropylene fiber reinforced concrete under cyclic compression[J]. China Civil Engineering Journal, 2019, 52(4): 1-12 (in Chinese).
[5] 孙杰, 冯川, 吴爽, 等. 持续荷载与冻融循环耦合作用下纤维混凝土损伤性能研究[J]. 硅酸盐通报, 2022, 41(8): 2728-2738.
SUN J, FENG C, WU S, et al. Damage properties of fiber concrete under coupling effect of continuous loading and freeze-thaw cycles[J]. Bulletin of the Chinese Ceramic Society, 2022, 41(8): 2728-2738 (in Chinese).
[6] 杜向琴, 刘志龙. 碳纤维对混凝土力学性能的影响研究[J]. 混凝土, 2018(4): 91-94.
DU X Q, LIU Z L. Study of carbon fiber on mechanical properties of concrete[J]. Concrete, 2018(4): 91-94 (in Chinese).
[7] 于江, 皮滟杰, 秦拥军. 循环载荷下再生混凝土损伤声发射特性[J]. 材料导报, 2021, 35(13): 13011-13017.
YU J, PI Y J, QIN Y J. Acoustics emission characteristics of damage of recycled aggregate concrete under cyclic loading[J]. Materials Reports, 2021, 35(13): 13011-13017 (in Chinese).
[8] HU X B, LU Q W, XU Z H, et al. Compressive stress-strain relation of recycled aggregate concrete under cyclic loading[J]. Construction and Building Materials, 2018, 193: 72-83.
[9] 陈宇良, 李浩, 叶培欢, 等. 循环荷载作用下钢纤维再生混凝土力学性能试验[J]. 复合材料学报, 2022, 39(11): 5574-5585.
CHEN Y L, LI H, YE P H, et al. Experimental study on mechanical behavior of steel fiber recycled concrete under cyclic compression[J]. Acta Materiae Compositae Sinica, 2022, 39(11): 5574-5585 (in Chinese).
[10] GUO Z, ZHUANG C L, LI Z H, et al. Mechanical properties of carbon fiber reinforced concrete (CFRC) after exposure to high temperatures[J]. Composite Structures, 2021, 256: 113072.
[11] 夏伟, 许金余, 聂良学, 等. 冲击荷载下纳米碳纤维混凝土的动态受压力学特性[J]. 材料导报, 2021, 35(22): 22063-22071.
XIA W, XU J Y, NIE L X, et al. Dynamic compressive mechanical properties of carbon nanofibers reinforced concrete under impact loading[J]. Materials Reports, 2021, 35(22): 22063-22071 (in Chinese).
[12] 王建超, 陆佳韦, 周静海, 等. 碳纤维再生混凝土力学性能的试验研究[J]. 混凝土, 2018(12): 95-99+103.
WANG J C, LU J W, ZHOU J H, et al. Experimental research on mechanical properties of carbon fiber recycled concrete[J]. Concrete, 2018(12): 95-99+103 (in Chinese).
[13] SHI C J, LI Y K, ZHANG J K, et al. Performance enhancement of recycled concrete aggregate: a review[J]. Journal of Cleaner Production, 2016, 112: 466-472.
[14] 郭鹏, 韦万峰, 杨帆, 等. 再生集料及再生混凝土界面过渡区研究进展[J]. 硅酸盐通报, 2017, 36(7): 2280-2286+2292.
GUO P, WEI W F, YANG F, et al. Progress on recycled concrete aggregate and interfacial transition zone of recycled concrete[J]. Bulletin of the Chinese Ceramic Society, 2017, 36(7): 2280-2286+2292 (in Chinese).
[15] 尹俊红, 纪艳春, 赫中营, 等. 碳纤维增强混凝土力学性能研究[J]. 河南大学学报(自然科学版), 2021, 51(6): 699-705.
YIN J H, JI Y C, HE Z Y, et al. Study on mechanical properties of carbon fiber reinforced concrete[J]. Journal of Henan University (Natural Science), 2021, 51(6): 699-705 (in Chinese).
[16] BAHN B Y, HSU T T C. Stress-strain behavior of concrete under cyclic loading[J]. ACI Materials Journal, 1998, 95(2): 178-193.
[17] 过镇海, 张秀琴, 张达成, 等. 混凝土应力-应变全曲线的试验研究[J]. 建筑结构学报, 1982, 3(1): 1-12.
GUO Z H, ZHANG X Q, ZHANG D C, et al. Experimental investigation of the complete stress-strain curve of concrete[J]. Journal of Building Structures, 1982, 3(1): 1-12 (in Chinese).