Experimental and Numerical Studies on Fiber Pull-Out of Steel Fiber Reinforced Cement Mortar at Different Ages

Abstract

Abstract: As a kind of multiphase composite, the reinforcement and toughening effect of steel fiber reinforced cementitious composite depends on the interfacial bonding properties between steel fiber and matrix. According to the single fiber pull-out tests and numerical simulation of the steel fiber reinforced cement mortar at different ages, the effects of ages on the interfacial bond properties of steel fiber reinforced cement mortar were studied. A meso-scale model of single fiber pull-out tests of the steel fiber reinforced cement mortar at different ages was established and verified by comparison with the simulated and tested results. The mechanism of interfacial bond between fiber and matrix of steel fiber reinforced cement mortar at different ages and the stress variation of the section around the interface between steel fiber and cement mortar matrix were analyzed by this model. The results show that, the simulated peak pull-out load and the pull-out curves are in good agreement with the tested results. Both the peak pull-out load of steel fiber and the interfacial bond strength between steel fiber and cement mortar matrix increase with the increase of age. The interfacial bond strength increases rapidly in the stage of the first 7 d, then slows down. The growth rate of interfacial bond strength in different age periods gradually decreases and tends to be stable with the increase of ages. The fitted mechanical parameters of the interface between steel fiber and cement mortar effectively simulate the pull-out process of the steel fiber.

Key words: age, steel fiber, cementitious composite, pull-out, interfacial bond property

CLC Number:

TU528

ZHAO Nan, QING Longbang, YANG Zhuofan, MU Ru. Experimental and Numerical Studies on Fiber Pull-Out of Steel Fiber Reinforced Cement Mortar at Different Ages[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2021, 40(7): 2165-2173.

References

[1] Naaman A E, Najm H. Bond-slip mechanisms of steel fibers in concrete[J]. ACI Materials Journal, 1991, 88(2): 135-145.
[2] 程俊,刘加平,张丽辉.超高性能混凝土纤维-基体黏结性能测试与机理分析[J].混凝土与水泥制品,2016(5):62-66.
CHENG J, LIU J P, ZHANG L H. Test and mechanical analysis on fiber-matrix bonding properties of ultra-high performance concrete[J]. China Concrete and Cement Products, 2016(5): 62-66 (in Chinese).
[3] 刘媛媛.纤维増强混凝土的拉拔性能试验研究[J].砖瓦,2018(3):11-13.
LIU Y Y. Experimental research on pulling performance of fiber reinforcement concrete[J]. Brick-Tile, 2018(3): 11-13 (in Chinese).
[4] 赵燕茹,邢永明,黄建永,等.数字图像相关方法在纤维混凝土拉拔试验中的应用[J].工程力学,2010,27(6):169-175.
ZHAO Y R, XING Y M, HUANG J Y, et al. Study on the fiber-reinforced concrete pull-out test using digital image correlation method[J]. Engineering Mechanics, 2010, 27(6): 169-175 (in Chinese).
[5] 叶居东,杨贞军,刘国华,等.超高性能混凝土-螺旋钢纤维拉拔力的解析解及实验验证[J].浙江大学学报(工学版),2018,52(10):1911-1918.
YE J D, YANG Z J, LIU G H, et al. Analytical solution and experimental verification of pullout force of twisted steel fibers in ultra-high performance concrete[J]. Journal of Zhejiang University (Engineering Science), 2018, 52(10): 1911-1918 (in Chinese).
[6] 李建辉,邓宗才.异型塑钢纤维-砂浆界面粘结性能[J].混凝土与水泥制品,2005(2):38-40.
LI J H, DENG Z C. Interfacial bonding properties of profiled plastic steel fiber mortar[J]. China Concrete and Cement Products, 2005(2): 38-40 (in Chinese).
[7] LEE Y, KANG S T, KIM J K. Pullout behavior of inclined steel fiber in an ultra-high strength cementitious matrix[J]. Construction and Building Materials, 2010, 24(10): 2030-2041.
[8] 王强,胡少伟,王阳.不同龄期混凝土断裂试验研究[J].人民长江,2018,49(9):91-97.
WANG Q, HU S W, WANG Y. Test and analysis on concrete fracture at different ages[J]. Yangtze River, 2018, 49(9): 91-97 (in Chinese).
[9] NGUYEN D H, DAO V T N. A novel approach to estimate the evolution of fracture energy and tensile softening curve of concrete from very early age[J]. Engineering Fracture Mechanics, 2018, 196: 43-55.
[10] 黄煜镔,钱觉时.龄期和养护方式对高强混凝土力学性能的影响[J].硅酸盐通报,2007,26(3):427-430.
HUANG Y B, QIAN J S. The influence on high strength concrete mechanical properties by age and curing condition[J]. Bulletin of the Chinese Ceramic Society, 2007, 26(3): 427-430 (in Chinese).
[11] 刘鹏,余志武,陈令坤.养护龄期对水泥混凝土性能和微观结构的影响[J].建筑材料学报,2012,15(5):717-723.
LIU P, YU Z W, CHEN L K. Influence of curing age on properties and micro structure of concrete[J]. Journal of Building Materials, 2012, 15(5): 717-723 (in Chinese).
[12] 范向前,胡少伟,朱海堂,等.龄期和试件尺寸对钢纤维混凝土抗折强度影响试验[J].混凝土,2011(5):27-29.
FAN X Q, HU S W, ZHU H T, et al. Experimental study on time and size affect the flexural strength of steel fiber reinforced concrete[J]. Concrete, 2011(5): 27-29 (in Chinese).
[13] BORDELON A, KIM M. Early-age fiber-reinforced concrete properties for overlays[J]. Mountain-Plains Consortium, 2018: 1-26.
[14] 齐春风,刘乙丁,田兴运,等.不同环境下钢纤维混凝土抗压强度随龄期变化的对比试验研究[J].工业建筑,2010,40(s1):879-881.
QI C F, LIU Y D, TIAN X Y, et al. Contrast experimental investigation on time-varying regularity of compressive strength of steel fiber reinforced concrete in different circumstances[J]. Industrial Construction, 2010, 40(s1): 879-881 (in Chinese).
[15] 宗晓东.纤维增强水泥基材料中钢纤维拉拔特性的研究[D].南京:南京理工大学,2004:27-29.
ZONG X D. Study on drawing characteristics of steel fiber in fiber reinforced cement based materials[D]. Nanjing: Nanjing University of Science and Technology, 2004: 27-29 (in Chinese).
[16] KIM M O, BORDELON A C. Age-dependent properties of fiber-reinforced concrete for thin concrete overlays[J]. Construction and Building Materials, 2017, 137: 288-299.
[17] 申海森.钢纤维混凝土强度和环境条件[J].华北水利水电学院学报,2006,27(2):32-35.
SHEN H S. Strength of steel fiber reinforced concrete and environment conditions[J]. Journal of North China Institute of Water Conservancy and Hydroelectric Power, 2006, 27(2): 32-35 (in Chinese).
[18] 高丹盈,刘建秀.钢纤维混凝土基本理论[M].北京:科学技术文献出版社,1994.
GAO D Y, LIU J X. Basic theory of steel fibre reinforced concrete[M]. Beijing: Scientific and Technical Documentation Press, 1994 (in Chinese).