Experimental Study on Compressive Strength of Ultra-High Performance Concrete with Hooked Steel Fiber

Abstract

Abstract: In order to study the influence of the content of hooked steel fibers on the compression performance of ultra-high performance concrete (UHPC), five groups UHPC cube specimens were tested under axial compression. The failure process and failure modes of UHPC specimens with different fiber volume fraction were recorded, and the load-displacement curves of them were compared. Then the fiber constraint coefficient and the influence of the constraint coefficient of end-hooked steel fiber on the compressive strength and compression energy consumption of UHPC cube specimens were analyzed. Based on the experimental data in this paper, a prediction model of UHPC cube specimens compressive strength was established. The results show that compared with the normal UHPC, when the hooked steel fiber is added to the test piece, the specimen starts to be damaged when the load is about 40% of the ultimate load. A continuous rapid fracture sound occurs inside the specimen when the load is close to the ultimate load. The UHPC specimens with end-hook type steel fibers finally failed and showed multiple diagonal cracks, and they can still remain as complete shape in the final failure, showing the phenomenon of "cracked but not broken". With the increase of the volume content of the hooked steel fiber, the compressive strength and the deformation of the specimen increase. Compared with the prime UHPC specimen, with the increase of fiber content, the influence of size effect on UHPC gradually decreases. Considering the fiber constraint index, a prediction model of UHPC cube compressive strength is established, which match well with the test results.

Key words: fiber constraint index, ultra-high performance concrete, compression performance, hooked end steel fiber, compression energy dissipation

CLC Number:

TU528.57

CHANG Yafeng, SHI Junping, HOU Yapeng. Experimental Study on Compressive Strength of Ultra-High Performance Concrete with Hooked Steel Fiber[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2021, 40(10): 3385-3395.

References

[1] 佘伟,张云升,张文华,等.较好韧性的超高强混凝土的制备及性能[J].建筑材料学报,2010,13(3):310-314.
SHE W, ZHANG Y S, ZHANG W H, et al. Preparation and performance of ultra-high strength concrete with good toughness[J]. Journal of Building Materials, 2010, 13(3): 310-314 (in Chinese).
[2] 中国工程建设标准化协会.纤维混凝土结构技术规程:CECS 38—2004[S].北京:中国计划出版社,2005.
China Engineering Construction Standardization Association. Technical specification for fibre reinforced concrete structures: CECS 38—2004[S]. Beijing: China Planning Press, 2005 (in Chinese).
[3] YOO D Y, LEE J H, YOON Y S. Effect of fiber content on mechanical and fracture properties of ultra high performance fiber reinforced cementitious composites[J]. Composite Structures, 2013, 106: 742-753.
[4] KIM J J, YOO D Y. Effects of fiber shape and distance on the pullout behavior of steel fibers embedded in ultra-high-performance concrete[J]. Cement and Concrete Composites, 2019, 103: 213-223.
[5] 方志,向宇,匡镇,等.钢纤维含量对活性粉末混凝土抗疲劳性能的影响[J].湖南大学学报(自然科学版),2011,38(6):6-12.
FANG Z, XIANG Y, KUANG Z, et al. Fatigue properties of reactive powder concrete with different steel fiber ratios[J]. Journal of Hunan University (Natural Sciences), 2011, 38(6): 6-12 (in Chinese).
[6] 谭彬.活性粉末混凝土受压应力应变全曲线的研究[D].长沙:湖南大学,2007:24.
TAN B. Research on stress-strain curves of reactive powder concrete under uniaxial compression[D]. Changsha: Hunan University, 2007: 24 (in Chinese).
[7] 吴有明.活性粉末混凝土(RPC)受压应力-应变全曲线研究[D].广州:广州大学,2012:4-5.
WU Y M. Study of the reactive powder concrete (RPC) about compressive stress-strain curve[D]. Guangzhou: Guangzhou University, 2012: 4-5 (in Chinese).
[8] 鞠彦忠,王德弘,李秋晨,等.钢纤维掺量对活性粉末混凝土力学性能的影响[J].实验力学,2011,26(3):254-260.
JU Y Z, WANG D H, LI Q C, et al. On the influence of steel fiber volume fraction on mechanical properties of reactive powder concrete[J]. Journal of Experimental Mechanics, 2011, 26(3): 254-260 (in Chinese).
[9] 朱平,池颜海,易笃韬,等.混杂钢纤维对钢纤维-超高性能混凝土界面黏结性能的影响[J].硅酸盐学报,2020,48(10):1669-1681.
ZHU P, CHI Y H, YI D T, et al. Influence of hybrid steel fibers on interfacial bond performance between steel fiber and ultrahigh-performance concrete[J]. Journal of the Chinese Ceramic Society, 2020, 48(10): 1669-1681 (in Chinese).
[10] WILLE K, NAAMAN A E. Pullout behavior of high-strength steel fibers embedded in ultra-high-performance concrete[J]. ACI Materials Journal, 2012, 109(4): 479-488.
[11] TAI Y S, EL-TAWIL S. High loading-rate pullout behavior of inclined deformed steel fibers embedded in ultra-high performance concrete[J]. Construction and Building Materials, 2017, 148: 204-218.
[12] 王冲,O′MOORE L.超高强微钢纤维增韧混凝土的制备及其力学性能研究[J].土木工程学报,2009,42(6):1-7.
WANG C, O′MOORE L. Preparation and mechanical properties of super high-strength steel micro-fiber toughened concrete[J]. China Civil Engineering Journal, 2009, 42(6): 1-7 (in Chinese).
[13] 蒋凌云,陈秋南,屈锋,等.氯盐侵蚀环境下钢纤维再生混凝土抗压性能试验研究[J].应用力学学报,2014,31(6):965-969+1001.
JIANG L Y, CHEN Q N, QU F, et al. Experimental study on compressive properties of steel fiber recycled aggregate concrete under chloride salt penetration[J]. Chinese Journal of Applied Mechanics, 2014, 31(6): 965-969+1001 (in Chinese).
[14] 白永兵,郝文秀,李宏斌,等.钢纤维活性粉末混凝土配合比试验研究[J].河北农业大学学报,2009,32(3):109-112.
BAI Y B, HAO W X, LI H B, et al. Experimental study on the proportions of raw materials of reactive powder concrete with steel fibre[J]. Journal of Agricultural University of Hebei, 2009, 32(3): 109-112 (in Chinese).
[15] 中华人民共和国建设部,国家质量监督检验检疫总局.普通混凝土力学性能试验方法标准:GB/T 50081—2002[S].北京:中国建筑工业出版社,2003.
Ministry of Housing and Urban-Rural Development of the People’s Republic of China, Inspection and Quarantine of the People’s Republic of China. Standard test method for mechanical properties of ordinary concrete: GB/T 50081—2002[S]. Beijing: China Planning Press, 2003 (in Chinese).
[16] 胡翱翔,梁兴文,李东阳,等.超高性能混凝土配合比设计及其受拉性能[J].湖南大学学报(自然科学版),2018,45(3):39-46.
HU A X, LIANG X W, LI D Y, et al. Mix design method and uniaxial tensile characteristics of ultra-high performance concrete[J]. Journal of Hunan University (Natural Sciences), 2018, 45(3): 39-46 (in Chinese).
[17] 胡翱翔,梁兴文,于婧,等.超高性能混凝土轴心受拉力学性能试验研究[J].湖南大学学报(自然科学版),2018,45(9):30-37.
HU A X, LIANG X W, YU J, et al. Experimental study of uniaxial tensile characteristics of ultra-high performance concrete[J]. Journal of Hunan University (Natural Sciences), 2018, 45(9): 30-37 (in Chinese).
[18] 中华人民共和国国家质量监督检验检疫总局,中国国家标准化管理委员会.活性粉末混凝土:GB/T 31387—2015[S].北京:中国标准出版社,2015.
General Administration of Quality Supervision, Inspection and Quarantine of the People’s Republic of China, National Standardization Administration of China. Reactive powder concrete: GB/T 31387—2015[S]. Beijing: China Planning Press, 2015 (in Chinese).
[19] 中国工程建设标准化协会.纤维混凝土试验方法标准:CECS 13—2009[S].北京:中国计划出版社,2010.
China Engineering Construction Standardization Association. Standard test method for fiber reinforced concrete: CECS 13—2009[S]. Beijing: China Planning Press, 2010 (in Chinese).
[20] RICHART F E. Reinforced concrete wall and column footings[J]. ACI Journal Proceedings, 1948, 45(10): 97-127.