•  
  •  
 

Abstract

To study the effect of steel fiber length on the axial tensile properties of UHPC, this paper selected straight circular fiber with the same diameter but different lengths and mixed it into UHPC. By conducting analysis on the mechanical properties, tensile deformation, and post-fracture strength of UHPC, the influence of fiber length on the axial tensile properties of UHPC was obtained. Meanwhile, the fracture resistance and toughening effects of fiber length were evaluated, with the reasons for the influence of fiber length on the axial tensile properties of UHPC clarified. The results show that the axial tensile properties of UHPC increase with the rising fiber length. The effect of 20 mm fiber length on the peak UHPC stress increases by 57.76% compared to 6 mm fiber length. The post-fracture strength of UHPC grows with the increasing fiber length. Under the same fracture width and fiber length of 20 mm, the UHPC stress is the highest, and the UHPC stress is the lowest under the fiber length of 6 mm. UHPC with 20 mm fiber length mixed has the maximum deformation in the strain hardening stage, while UHPC with 13 mm fiber length has the maximum deformation in the stress softening stage. The UHPC fluidity decreases with the increasing fiber length. Additionally, the effect of fiber length on the axial tensile properties of UHPC is altered by changing the contact surface size between the fiber and the matrix. Specifically, the longer fiber leads to the larger contact surface between the fiber and the matrix, bringing about stronger cohesion between the fiber and the matrix.

Publication Date

1-18-2024

DOI

10.14048/j.issn.1671-2579.2023.06.015

First Page

94

Last Page

100

Submission Date

March 2025

Reference

[1] 陈宝春, 黄卿维, 王远洋, 等. 中国第一座超高性能混凝土(UHPC)拱桥的设计与施工[J]. 中外公路, 2016, 36(1): 67-71. CHEN Baochun, HUANG Qingwei, WANG Yuanyang, et al. Design and construction of China 's first ultra-high performance concrete ( UHPC ) arch bridge [J]. Journal of China & Foreign Highway, 2016, 36(1): 67-71. [2] 刘娟红, 宋少民. 活性粉末混凝土——配制、性能与微结构[M]. 北京: 化学工业出版社, 2013. LIU Juanhong, SONG Shaomin. Reactive powder concrete-preparation, properties and microstructure [M]. Beijing: Chemical Industry Press, 2013. [3] 袁明, 梁恩, 颜东煌, 等. 配合比参数影响钢纤维-基体界面黏结性能的试验[J]. 长安大学学报(自然科学版), 2020, 40(6): 57-66. YUAN Ming, LIANG En, YAN Donghuang, et al. Investigation on effect of mixture ratio on interfacial bonding properties of steel fiber-matrix[J]. Journal of Chang’an University (Natural Science Edition), 2020, 40(6): 57-66. [4] 王秋维, 王志伟, 陶毅, 等. 配合比及养护制度对活性粉末混凝土强度影响的试验研究[J]. 西安建筑科技大学学报(自然科学版), 2017, 49(3): 382-387. WANG Qiuwei, WANG Zhiwei, TAO Yi, et al. Experimental research on effect of mix ratioandcuring system on the strength of reactive powder concrete[J]. Journal of Xi’an University of Architecture & Technology (Natural Science Edition), 2017, 49(3): 382-387. [5] 赵一鹤, 孙振平, 穆帆远, 等. 钢纤维对UHPC拉伸性能及其拔出行为的影响[J]. 建筑材料学报, 2021, 24(2): 276-282. ZHAO Yihe, SUN Zhenping, MU Fanyuan, et al. Effect of steel fibers on tensile properties of ultra-high performance concrete and its pullout behavior[J]. Journal of Building Materials, 2021, 24(2): 276-282. [6] 杜任远，陈宝春，沈秀将.不同方法测试的超高性能混凝土抗拉强度[J].材料导报(纳米与新材料专辑)，2016(2)：483‑486，520. DU Renyuan, CHEN Baochun, SHEN Xiujiang. Tensile strength of ultra-high performance concrete tested by different methods [J]. Materials Review (Special Issue on Nanomaterials and New Materials), 2016(2): 483-486, 520. [7] 邵旭东, 李芳园, 邱明红, 等. 钢纤维特性对UHPC轴拉性能与弯拉性能的影响及对比研究[J]. 中国公路学报, 2020, 33(4): 51-64. SHAO Xudong, LI Fangyuan, QIU Minghong, et al. Influential and comparative research on the effects of steel fiber properties on the axial tensile and bending tensile properties of UHPC[J]. China Journal of Highway and Transport, 2020, 33(4): 51-64. [8] 刘琼伟.UHPC轴拉性能及弯拉‑轴拉换算关系研究[D].长沙:湖南大学,2021. LIU Qiongwei. Study on the axial tensile performance and conversion relationship between flexural and axial tensile strength of UHPC [D]. Changsha: Hunan University, 2021. [9] WILLE K, KIM D J, NAAMAN A E. Strain-hardening UHP-FRC with low fiber contents[J]. Materials and Structures, 2011, 44(3): 583-598. [10] 张哲, 邵旭东, 李文光, 等. 超高性能混凝土轴拉性能试验[J]. 中国公路学报, 2015, 28(8): 50-58. ZHANG Zhe, SHAO Xudong, LI Wenguang, et al. Axial tensile behavior test of ultra high performance concrete[J]. China Journal of Highway and Transport, 2015, 28(8): 50-58. [11] 宋焱.级配纤维超高性能混凝土抗拉性能研究[D].长沙：湖南大学，2006. SONG Yan. Study on the tensile performance of graded fiber reinforced ultra-high performance concrete [D]. Changsha: Hunan University, 2006. [12] LI V C, WU H C, MAALEJ M, et al. Tensile behavior of cement-based composites with random discontinuous steel fibers[J]. Journal of the American Ceramic Society, 1996, 79(1): 74-78. [13] 高绪明. 钢纤维对超高性能混凝土性能影响的研究[D]. 长沙: 湖南大学, 2013. GAO Xuming. Study on the effect of steel fiber on the performance of ultra-high performance concrete. Changsha: Hunan University, 2013. [14] 周腾,裴炳志,黄政宇,等.钢纤维掺量对UHPC轴拉性能的影响[J].中外公路,2022,42(5):120‑124. ZHOU Teng, PEI Bingzhi, HUANG Zhengyu, et al. Influence of steel fiber content on the axial tensile performance of UHPC [J]. Journal of China and Foreign Highway, 2022, 42(5): 120-124. [15] 苏家战, 林毅焌, 陈宝春, 等. 不同形状钢纤维对UHPC受拉性能影响的试验研究[J]. 宁夏大学学报(自然科学版), 2020, 41(3): 246-251,261. SU Jiazhan, LIN Yijun, CHEN Baochun, et al. Experimental study on the tensile properties of ultra-high performance concrete with different types of steel fiber[J]. Journal of Ningxia University (Natural Science Edition), 2020, 41(3): 246-251,261. [16] ROY M, HOLLMANN C, WILLE K. Influence of fiber volume fraction and fiber orientation on the uniaxial tensile behavior of rebar-reinforced ultra-high performance concrete[J]. Fibers, 2019, 7(7): 67. [17] 袁明, 贺文杰, 颜东煌, 等. 超高性能混凝土配合比优化研究[J]. 中外公路, 2019, 39(6): 169-173. YUAN Ming, HE Wenjie, YAN Donghuang, et al. Investigation on optimizing mixing ratio of ultra-high performance concrete[J]. Journal of China & Foreign Highway, 2019, 39(6): 169-173. [18] 赵辛玮, 肖汝诚, 孙斌, 等. 常温养护型超高性能混凝土组合桥面板收缩性能研究[J]. 中外公路, 2020, 40(3): 100-108. ZHAO Xinwei, XIAO Rucheng, SUN Bin, et al. Study on shrinkage performance of composite bridge deck with ultra-high performance concrete cured in normal temperature[J]. Journal of China & Foreign Highway, 2020, 40(3): 100-108. [19] Standard Test Method for Splitting Tensile Strength of Cylindrical Concrete Specimens: ASTM C496/C496M-04e1[S]. ASTM International[astm] . [20] AFNOR N F .National addition to eurocode 2‑design of concrete structures：Specific rules for ultra‑high performance fibre reinforced concrete(UHPFRC)[S].Paris：French Standard Institute，2016. [21] 杨简, 陈宝春, 沈秀将, 等. UHPC单轴拉伸试验狗骨试件优化设计[J]. 工程力学, 2018, 35(10): 37-46,55. YANG Jian, CHEN Baochun, SHEN Xiujiang, et al. The optimized design of dog-bones for tensile test of ultra-high performance concrete[J]. Engineering Mechanics, 2018, 35(10): 37-46,55. [22] 中国建筑材料科学研究院有限公司，厦门艾思欧标准砂有限公司，安徽海螺水泥股份有限公司，等.. 水泥胶砂强度检验方法: GB/T 17671—2021[S]. 北京: 中国标准出版社, 2021. China Building Materials Academy Co., Ltd, Standardization Administration of the People’s Republic of China. Test method of cement mortar strength(ISO method): GB/T 17671—2021[S]. Beijing: Standards Press of China, 2021. [23] RAFIEE A. Computer modeling and investigation on the steel corrosion in cracked ultra high performance concrete[M]. Kassel: Kassel Univ., 2012. [24] 李艺, 赵文. 混杂纤维混凝土阻裂增韧及耐久性能[M]. 北京: 科学出版社, 2012. LI Yi, ZHAO Wen. Crack resistance toughening and durability of hybrid fiber reinforced concrete [M]. Beijing: Science Press, 2012. [25] 戚家南.基于界面粘结性能多尺度分析的UHPC梁计算方法与试验研究[D].南京：东南大学，2018. QI Jiana. Study on the calculation method and experimental research of uhpc beams based on multi-scale analysis of interfacial bonding performance [D]. Nanjing: Southeast University, 2018. [26] 韦炳灯.钢纤维与活性粉末混凝土基体界面粘结性能研究[D].长沙：长沙理工大学，2019. WEI Bingdeng. Study on the bonding performance between steel fibers and reactive powder concrete matrix [D]. Changsha: Changsha University of Science and Technology, 2019. [27] DENG F Q, DING X X, CHI Y, et al. The pull-out behavior of straight and hooked-end steel fiber from hybrid fiber reinforced cementitious composite: experimental study and analytical modelling[J]. Composite Structures, 2018, 206: 693-712.

Download

Share

COinS