Failure Precursory Characteristics of Early-Age Steel Fiber Reinforced Concrete under Uniaxial Compression

Abstract

Abstract: Affected by hydration and external load, early-age concrete is prone to crack, which affects the durability of the structure. And the resistivity can better reflect the internal damage degree of concrete. In this study, the resistivity monitoring experiments of steel fiber reinforced concrete (SFRC) and normal concrete (NC) during uniaxial compression were carried out to study the influence of age on the resistivity variation characteristics of SFRC during uniaxial compression. The wave velocity tests of SFRC and NC at different ages were carried out. The findings indicate that the resistivity variation of SFRC during uniaxial compression is significantly influenced by age. Specifically, in the period of 28 d, the resistivity variation patterns exhibit an “L” type, a “V” type, and a “U” type. The resistivity of all specimens increases when specimens approach failure. The rate of increase is minimal at 1 and 3 d, but becomes significant at 7, 14, and 28 d. The resistivity data provides insights into the initiation and progression of cracks in concrete, with the gradual increase in resistivity serving as an indicator of impending failure in SFRC. The strength and wave velocity of SFRC are higher than that of NC, and the strength and wave velocity of concrete increase with age.

Key words: steel fiber reinforced concrete, early-age, uniaxial compression, resistivity, wave velocity

CLC Number:

TU528

PAN Xiaofeng, CAO Jiantao, LUO Tao, TANG Liyun. Failure Precursory Characteristics of Early-Age Steel Fiber Reinforced Concrete under Uniaxial Compression[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2024, 43(7): 2470-2478.

References

[1] 王福明, 万嘉祺, 黄澳斯, 等. 单调和重复荷载作用下钢-聚丙烯混杂纤维ECC轴压力学性能试验研究[J]. 建筑结构学报, 2023, 44(1): 344-353.
WANG F M, WAN J Q, HUANG A S, et al. Experimental study of axial compression performance of steel-polypropylene hybrid fiber ECC under monotonic and repeated loadings[J]. Journal of Building Structures, 2023, 44(1): 344-353 (in Chinese).
[2] 牛艳伟, 匡笑艳, 郑军涛, 等. SFCC现场导热系数与温度场实测及预测方法研究[J]. 建筑材料学报, 2024, 27(3): 245-252+282.
NIU Y W, KUANG X Y, ZHENG J T, et al. Experimental study and prediction on thermal conductivity of steel fiber reinforced lightweight concrete and temperature field test[J]. Journal of Building Materials, 2024, 27(3): 245-252+282 (in Chinese).
[3] 李力剑, 刘素梅, 徐凡丁, 等. 含粗骨料超高性能混凝土的单轴受拉力学性能[J]. 建筑材料学报, 2024, 27(2): 163-173.
LI L J, LIU S M, XU F D, et al. Uniaxial tensile behavior and mechanism analysis of ultra-high performance concrete containing coarse aggregate[J]. Journal of Building Materials, 2024, 27(2): 163-173 (in Chinese).
[4] 谢建斌, 何天淳, 程赫明, 等. 循环荷载下路面用钢纤维混凝土的弯曲疲劳研究[J]. 兰州理工大学学报, 2004, 30(2): 104-109.
XIE J B, HE T C, CHENG H M, et al. Investigation flexural fatigue behavior of steel fiber reinforced concrete for pavement surface stratum under cyclic load[J]. Journal of Lanzhou University of Technology, 2004, 30(2): 104-109 (in Chinese).
[5] 张春生, 孟令其, 纪安业, 等. 钢纤维掺量对高性能混凝土碳化性能影响机理研究[J]. 硅酸盐通报, 2018, 37(10): 3206-3212.
ZHANG C S, MENG L Q, JI A Y, et al. Mechanism study of steel fiber content on the carbonization resistance of high performance concrete[J]. Bulletin of the Chinese Ceramic Society, 2018, 37(10): 3206-3212 (in Chinese).
[6] 段小芳, 袁娇娇. 塑钢纤维混凝土早龄期力学性能及弹性模量试验研究[J]. 水电能源科学, 2021, 39(12): 168-171+96.
DUAN X F, YUAN J J. Experimental study on mechanical properties and elastic modulus of plastic steel fiber reinforced concrete at early age[J]. Water Resources and Power, 2021, 39(12): 168-171+96 (in Chinese).
[7] 付传清, 陈军, 金贤玉, 等. 早龄期混凝土的电阻率特性和微观形貌研究[J]. 混凝土, 2015(4): 32-36.
FU C Q, CHEN J, JIN X Y, et al. Electrical resistivity property and microstructure development of young concrete[J]. Concrete, 2015(4): 32-36 (in Chinese).
[8] 刘志洪, 胡昱, 邬昆, 等. 低热水泥混凝土早龄期断裂性能发展特性研究[J]. 人民长江, 2022, 53(1): 175-181.
LIU Z H, HU Y, WU K, et al. Study on fracture development characteristics of low-heat cement concrete at early age[J]. Yangtze River, 2022, 53(1): 175-181 (in Chinese).
[9] 陈军. 早龄期混凝土水化进程及宏观与细微观性能相关性研究[D]. 杭州: 浙江大学, 2014.
CHEN J. Hydration process and correlation of macro-and meso-/micro-properties of early-age concrete[D]. Hangzhou: Zhejiang University, 2014 (in Chinese).
[10] 李化建, 谢永江, 易忠来, 等. 混凝土电阻率的研究进展[J]. 混凝土, 2011(6): 35-40.
LI H J, XIE Y J, YI Z L, et al. Advance in research on electrical resistivity of concrete[J]. Concrete, 2011(6): 35-40 (in Chinese).
[11] 廖宜顺, 万世辉, 肖剑, 等. 基于电阻率法研究矿物掺合料对铝酸盐水泥水化的影响[J]. 武汉科技大学学报, 2021, 44(5): 352-357.
LIAO Y S, WAN S H, XIAO J, et al. Effects of mineral admixtures on hydration of aluminate cement investigated by electrical resistivity method[J]. Journal of Wuhan University of Science and Technology, 2021, 44(5): 352-357 (in Chinese).
[12] 廖国胜, 杨书超, 汪琰皓, 等. 不同稠度条件下的水泥基材料电阻率与水化特性研究[J]. 武汉科技大学学报, 2018, 41(6): 434-438.
LIAO G S, YANG S C, WANG Y H, et al. Resistivity and hydration characteristics of cement-based materials under different consistency conditions[J]. Journal of Wuhan University of Science and Technology, 2018, 41(6): 434-438 (in Chinese).
[13] ZENG X H, LIU H C, ZHU H S, et al. Study on damage of concrete under uniaxial compression based on electrical resistivity method[J]. Construction and Building Materials, 2020, 254: 119270.
[14] ZHOU C S, LI K F, HAN J G. Characterizing the effect of compressive damage on transport properties of cracked concretes[J]. Materials and Structures, 2012, 45(3): 381-392.
[15] 魏小胜, 肖莲珍, 李宗津, 等. 钢纤维水泥基材料的导电机理和水化特性[J]. 混凝土, 2006(4): 11-13+51.
WEI X S, XIAO L Z, LI Z J, et al. Conductive mechanism and hydration property of cement-based materials with steel fibers[J]. Concrete, 2006(4): 11-13+51 (in Chinese).
[16] CHIARELLO M, ZINNO R. Electrical conductivity of self-monitoring CFRC[J]. Cement and Concrete Composites, 2005, 27(4): 463-469.
[17] SHAN W, LIU Y, HU Z G, et al. A model for the electrical resistivity of frozen soils and an experimental verification of the model[J]. Cold Regions Science and Technology, 2015, 119: 75-83.
[18] SNYDER K A, FENG X, KEEN B D, et al. Estimating the electrical conductivity of cement paste pore solutions from OH^-, K⁺ and Na⁺ concentrations[J]. Cement and Concrete Research, 2003, 33(6): 793-798.
[19] DUAN Z, YAN X S, SUN Q, et al. New models for calculating the electrical resistivity of loess affected by moisture content and NaCl concentration[J]. Environmental Science and Pollution Research, 2022, 29(12): 17280-17294.
[20] SUITS L D, SHEAHAN T C, MUÑOZ-CASTELBLANCO J A, et al. The influence of changes in water content on the electrical resistivity of a natural unsaturated loess[J]. Geotechnical Testing Journal, 2012, 35(1): 103587.
[21] TANG L Y, WANG K, JIN L, et al. A resistivity model for testing unfrozen water content of frozen soil[J]. Cold Regions Science and Technology, 2018, 153: 55-63.
[22] DUAN Z, YAN X S, SUN Q, et al. Effects of water content and salt content on electrical resistivity of loess[J]. Environmental Earth Sciences, 2021, 80(14): 469.
[23] 张仕桦, 刘京红, 刘婷, 等. 粉煤灰再生混凝土强度的超声检测研究[J]. 混凝土, 2020(4): 14-18.
ZHANG S H, LIU J H, LIU T, et al. Ultrasonic analysis on strength of recycled concrete with fly ash[J]. Concrete, 2020(4): 14-18 (in Chinese).
[24] 范向前, 葛菲. 基于声发射技术的早龄期混凝土断裂性能[J]. 建筑材料学报, 2024, 27(2): 153-160.
FAN X Q, GE F. Fracture performance of early-age concrete based on acoustic emission[J]. Journal of Building Materials, 2024, 27(2): 153-160 (in Chinese).
[25] EAGLAND D. The influence of hydration on the stability of hydrophobic colloidal systems[M]//Water in Disperse Systems. Boston, MA: Springer US, 1975: 1-74.
[26] LOWKE D, GEHLEN C. The zeta potential of cement and additions in cementitious suspensions with high solid fraction[J]. Cement and Concrete Research, 2017, 95: 195-204.