废旧钢纤维增强橡胶混凝土力学性能试验研究

摘要/Abstract

摘要： 为了改善由橡胶颗粒加入混凝土中引起的强度损失,在三种强度的橡胶混凝土(RC)中加入体积掺量为0.5%~2.0%的废旧钢纤维增强RC的力学性能,分别测试了各废旧钢纤维增强橡胶混凝土(SSFRC)在28 d的立方体抗压强度、劈裂抗拉强度、四点抗折强度与轴心抗压强度。引入拉压比、折压比与韧性指数对SSFRC的韧性进行评价,结合宏观试验数据和SEM分析废旧钢纤维对RC力学性能的增强增韧机理。结果表明:橡胶的加入会降低不同基体强度混凝土的各力学性能;不同基体强度的SSFRC的各力学强度随着钢纤维掺量的增加呈先增加后下降的趋势,抗压强度在钢纤维掺量为1.0%时达到峰值,抗拉和抗折强度在钢纤维体积掺量为1.5%时达到峰值;钢纤维可在一定掺量下与橡胶颗粒协同作用进一步增加RC的韧性;废旧钢纤维-基体界面过渡区的微观形貌表明废旧钢纤维局部也发生了水化反应。综上,在橡胶体积掺量为10%、废旧钢纤维体积掺量为1.5%时,SSFRC的各力学强度增强效果最好,且韧性最佳。

关键词: 废旧钢纤维, 橡胶混凝土, 固废利用, 力学性能, 增强增韧性能, 微观分析

Abstract: To improve the strength loss caused by the incorporation of rubber particles into concrete, the mechanical properties of three kinds of rubber concrete (RC) were enhanced by adding scrap steel fiber with volume content of 0.5%~2.0%. The cube compressive strength, splitting tensile strength, four-point flexural strength, and axial compressive strength of each scrap steel fiber reinforced rubber concrete (SSFRC) at 28 d were tested. To measure the compressive toughness of SSFRC, the tensile-compressive ratio, flexural-compressive ratio, and toughness index were introduced. Macroscopic test results and SEM were used to analyze the mechanism of strengthening and toughening of RC mechanical properties by scrap steel fiber. The results show that adding rubber decreases the mechanical properties of concrete with various matrix strength. Adding steel fiber admixture causes a trend in the mechanical strength of SSFRC with various matrix strength to increase first and then decrease, getting the greatest compressive strength at 1.0%, the greatest tensile and flexural strength at 1.5% of steel fiber. Steel fiber and rubber particles can cooperate at a specific admixture amount to increase the toughness of RC. The local hydration of scrap steel fiber may have taken place, according to the microscopic morphology of the transition zone at the interface between the matrix and scrap steel fiber. In conclusion, the best mechanical strength enhancement effect and the best toughness of SSFRC are achieved at 10% of rubber and 1.5% of scrap steel fiber.

Key words: scrap steel fiber, rubber concrete, solid waste utilization, mechanical property, strengthening and toughening property, microanalysis

中图分类号:

TU528.572

彭蔓, 高涌涛, 韩杨, 陈秀丽, 寇雄俊. 废旧钢纤维增强橡胶混凝土力学性能试验研究[J]. 硅酸盐通报, 2023, 42(9): 3286-3294.

PENG Man, GAO Yongtao, HAN Yang, CHEN Xiuli, KOU Xiongjun. Experimental Study on Mechanical Properties of Scrap Steel Fiber Reinforced Rubber Concrete[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2023, 42(9): 3286-3294.

参考文献

[1] 王晓初, 江必有, 聂晓梅. 中国废旧轮胎循环利用前景与建议[J]. 橡塑技术与装备, 2022, 48(8): 5-8.
WANG X C, JIANG B Y, NIE X M. Prospects and suggestions for recycling waste tires in China[J]. China Rubber/Plastics Technology and Equipment, 2022, 48(8): 5-8 (in Chinese).
[2] 姜雪丹. 富氧条件下废弃轮胎颗粒的着火、燃烧和排放特性研究[D]. 合肥: 中国科学技术大学, 2020: 3-12.
JIANG X D. Study on ignition, combustion and emission characteristics of waste tire particles under oxygen-enriched conditions[D]. Hefei: University of Science and Technology of China, 2020: 3-12 (in Chinese).
[3] 刘家兴, 杨荣周, 徐颖, 等. 超高强度橡胶混凝土的力学特性及能量演化[J]. 建筑材料学报: 1-11 [2023-05-06]. https://kns.cnki.net/kcms/detail/31.1764.TU.20221115.0926.004.html.
LIU J X, YANG R Z, XU Y, et al. Mechanical properties and energy evolution of ultra high strength rubber concrete[J]. Journal of Building Materials: 1-11 [2023-05-06]. https://kns.cnki.net/kcms/detail/31.1764.TU.20221115.0926.004.html (in Chinese).
[4] 朱浩君, 薛刚, 刘利强, 等. 橡胶混凝土的疲劳行为与损伤机理[J]. 武汉大学学报(工学版): 1-9 [2023-05-06]. https://kns.cnki.net/kcms/detail//42.1675.T.20230216.1625.004.html.
ZHU H J, XUE G, LIU L Q, et al. Fatigue behavior and damage mechanism of rubber concrete[J]. Engineering Journal of Wuhan University: 1-9 [2023-05-06]. https://kns.cnki.net/kcms/detail//42.1675.T.20230216.1625.004.html (in Chinese).
[5] 龙一飞, 潘婵, 郭晓琴, 等. 冻融循环下橡胶混凝土动态力学特性试验研究[J]. 工业建筑, 2022, 52(4): 163-170+139.
LONG Y F, PAN C, GUO X Q, et al. Experimental research on dynamic mechanical properties of rubber concrete subjected to freeze-thaw cycles[J]. Industrial Construction, 2022, 52(4): 163-170+139 (in Chinese).
[6] 薛刚, 朱浩君, 许胜, 等. 橡胶混凝土单轴受压疲劳性能研究[J]. 工程力学, 2022, 39(11): 203-211.
XUE G, ZHU H J, XU S, et al. Study on fatigue performance of rubber concrete under uniaxial compression[J]. Engineering Mechanics, 2022, 39(11): 203-211 (in Chinese).
[7] 庞建勇, 张琴, 姚韦靖, 等. 钢纤维橡胶混凝土力学性能试验[J]. 中国科技论文, 2020, 15(11): 1302-1307.
PANG J Y, ZHANG Q, YAO W J, et al. Mechanical property test of steel fiber rubber concrete[J]. China Sciencepaper, 2020, 15(11): 1302-1307 (in Chinese).
[8] 赵修敏, 杨海峰, 李雪良, 等. 钢纤维橡胶混凝土的静力和动冲击性能研究[J]. 工业建筑, 2021, 51(8): 173-178.
ZHAO X M, YANG H F, LI X L, et al. Study on static and dynamic impact properties of steel-fiber reinforced rubber concrete[J]. Industrial Construction, 2021, 51(8): 173-178 (in Chinese).
[9] LAI D D, DEMARTINO C, XIAO Y. High-strain rate tension behavior of fiber-reinforced rubberized concrete[J]. Cement and Concrete Composites, 2022, 131: 104554.
[10] CHARKHTAB MOGHADDAM S, MADANDOUST R, JAMSHIDI M, et al. Mechanical properties of fly ash-based geopolymer concrete with crumb rubber and steel fiber under ambient and sulfuric acid conditions[J]. Construction and Building Materials, 2021, 281: 122571.
[11] 白春, 麻凤海, 刘书贤, 等. 塑钢纤维增强橡胶混凝土耐硫酸盐侵蚀试验[J]. 非金属矿, 2019, 42(3): 32-35.
BAI C, MA F H, LIU S X, et al. The test of plastic-steel fiber reinforced rubber concrete anti-eroding sulphate[J]. Non-Metallic Mines, 2019, 42(3): 32-35 (in Chinese).
[12] 吴伟波, 余阳, 夏冬桃. 钢纤维增强橡胶粉早强混凝土的路用性能[J]. 新型建筑材料, 2018, 45(3): 36-40+43.
WU W B, YU Y, XIA D T. Pavement performance of steel fiber reinforced rubber powder early strength concrete[J]. New Building Materials, 2018, 45(3): 36-40+43 (in Chinese).
[13] 赵秋红, 董硕, 朱涵. 钢纤维-橡胶/混凝土抗剪性能试验[J]. 复合材料学报, 2020, 37(12): 3201-3213.
ZHAO Q H, DONG S, ZHU H. Experimental study on shear behavior of steel fiber-rubber/concrete[J]. Acta Materiae Compositae Sinica, 2020, 37(12): 3201-3213 (in Chinese).
[14] LIU R Y, LI H, JIANG Q H, et al. Experimental investigation on flexural properties of directional steel fiber reinforced rubberized concrete[J]. Structures, 2020, 27: 1660-1669.
[15] 刘家兴, 杨荣周, 徐颖, 等. 疲劳荷载对橡胶-钢纤维混凝土变形、能量及损伤性能的影响[J]. 科学技术与工程, 2022, 22(28): 12571-12578.
LIU J X, YANG R Z, XU Y, et al. Effect of fatigue load on deformation, energy and damage performance of rubber-steel fiber concrete[J]. Science Technology and Engineering, 2022, 22(28): 12571-12578 (in Chinese).
[16] 张向冈, 邝肖梅, 牛海成, 等. 废橡胶改性再生混凝土材料性能研究进展[J]. 硅酸盐通报, 2017, 36(12): 4050-4059.
ZHANG X G, KUANG X M, NIU H C, et al. Research progress on material properties of recycled aggregate concrete modified by waste rubber[J]. Bulletin of the Chinese Ceramic Society, 2017, 36(12): 4050-4059 (in Chinese).
[17] 白春, 麻凤海, 刘书贤, 等. 塑钢纤维增强橡胶混凝土制备及其抗冻性分析[J]. 非金属矿, 2018, 41(2): 35-37.
BAI C, MA F H, LIU S X, et al. Preparation of plastic steel fiber reinforced rubber concrete and its test analysis of frost resistance[J]. Non-Metallic Mines, 2018, 41(2): 35-37 (in Chinese).
[18] NOAMAN A T, ABU BAKAR B H, AKIL H M. Experimental investigation on compression toughness of rubberized steel fibre concrete[J]. Construction and Building Materials, 2016, 115: 163-170.
[19] 薛刚, 侯帅, 牛建刚. 塑钢纤维橡胶混凝土路用性能试验研究[J]. 建筑结构, 2019, 49(12): 98-102+108.
XUE G, HOU S, NIU J G. Experimental research on pavement performance of rubber concrete incorporated with plastic-steel fiber[J]. Building Structure, 2019, 49(12): 98-102+108 (in Chinese).
[20] GAO Y T, WANG B, LIU C J, et al. Experimental investigation on static compressive toughness of steel fiber rubber concrete[J]. Reviews on Advanced Materials Science, 2022, 61(1): 576-586.
[21] 于俊洋. 钢纤维橡胶混凝土抗冲击性能试验研究[D]. 郑州: 郑州大学, 2021.
YU J Y. Experimental study on impact resistance of steel fiber rubber concrete[D]. Zhengzhou: Zhengzhou University, 2021 (in Chinese).
[22] 李健男. 橡胶颗粒预处理对橡胶混凝土性能影响研究[D]. 沈阳: 沈阳建筑大学, 2020: 34-35.
LI J N. Study on the influence of rubber particle pretreatment on the properties of rubber concrete[D]. Shenyang: Shenyang Jianzhu University, 2020: 34-35 (in Chinese).
[23] EISA A S, ELSHAZLI M T, NAWAR M T. Experimental investigation on the effect of using crumb rubber and steel fibers on the structural behavior of reinforced concrete beams[J]. Construction and Building Materials, 2020, 252: 119078.
[24] 薛刚, 孙立所, 万梓豪. 橡胶混凝土抗压强度及细观破坏机理[J]. 混凝土, 2022(1): 84-87+96.
XUE G, SUN L S, WAN Z H. Study on compressive strength of rubber concrete cube based on meso-level[J]. Concrete, 2022(1): 84-87+96 (in Chinese).
[25] HE L, CAI H D, HUANG Y, et al. Research on the properties of rubber concrete containing surface-modified rubber powders[J]. Journal of Building Engineering, 2021, 35: 101991.