Influence of Steel Fiber Shape and Curing System on Strength and Toughness of UHPC
CHEN Congcong 1, 2, WU Zemei1,2,*, HU Xiang1,2, SHI Caijun1,2,*
1 Key Laboratory for Green & Advanced Civil Engineering Materials and Application Technologies of Hunan Province, College of Civil Engineering, Hunan University, Changsha 410082, China 2 International Science and Technology Innovation Center for Green & Advanced Civil Engineering Materials of Hunan Province, Changsha 410082, China
Abstract: Thermal curing and adding deformed steel fibers are effective in improving strength and toughness of UHPC. In this work, the effects of curing regime (28 d standard curing, 2 d of 90 ℃ steam curing, and 2 d of 90 ℃ hot water curing) and steel fiber shape (straight, corrugated, and hooked) on cubic compressive strength, uniaxial compressive strength, and flexural properties of UHPC were studied. ASTM C1018, JSCE-SF4, and modified Post-Crack-Energy Ratio (PCER) were used to evaluate the flexural toughness of UHPC. The 3D optical scanner was used to quantify the roughness of the fracture surface of UHPC with different steel fiber shapes. The results show that 2 d of hot water curing and steam curing improved the mechanical properties of UHPC to a certain extent, and the flexural properties of UHPC were significantly improved, in comparison to 28 d standard curing. Compared to UHPC with straight steel fibers, UHPC with hooked steel fibers increased the flexural strength and PCER toughness index by 46.26%—58.82% and 32.77%—39.81%, respectively, and enhanced the fracture surface roughness RN by 41.67%. A good exponential relationship is found between roughness parameters and bending toughness, and the roughness parameter can be used to characterize the toughness of UHPC. Besides, a linear relationship between uniaxial compressive strength and cubic compressive strength was found, and the correlation coefficient ranged from 0.83 to 0.93. The toughness indexes evaluated using ASTM C1018 and PCER methods were basically consistent with the results obtained by using the area enclosed by load-displacement curve at 4 mm deflection and the flexural properties. The proposed modified PCER method introduced the initial flexural toughness ratio to characterize the flexural toughness before reaching the peak deflection, which rendered more accurate calculation results.
通讯作者:
* 吴泽媚,国家高层次青年人才,博士研究生导师,获密苏里科技大学博士学位并从事博士后研究。主要研究领域为新型道路建筑材料的设计、研发与应用,包括高性能与超高性能混凝土微观与性能研究及模拟、"双碳"战略下工业固体废弃物在建筑材料中的综合利用、长寿命道路新材料的研发及应用等。发表英文著作/章节2部,学术论文70余篇,其中SCI论文40余篇,ESI高被引论文3篇,入选斯坦福大学发布的2023年度“全球前2%顶尖科学家榜单”(World’s Top 2% Scientists)。主编/参编行业与地方标准5项,授权发明专利3项。wuzemei@hnu.edu.cn 史才军,乌克兰工程院外籍院士、国家特聘专家、湖南省特聘专家、亚洲混凝土联合会主席,湖南大学 985工程创新平台首席科学家、特聘教授、建筑安全和节能重点实验室教育部主任、绿色高性能土木工程材料及应用技术湖南省重点实验室主任、湖南省绿色高性能土木工程材料国际创新科技合作基地主任、博士研究生导师。在水泥和混凝土材料的设计、测试、耐久性、智能防渗漏材料及废物的利用和处置方面开展了广泛深入的研究工作,发表高水平学术论文540余篇。出版英文著作8部,中文著作4部,合编国际会议英文论文集11本。2015—2020年“建设与建造”领域中国高被引学者排名第一,在斯坦福大学Ioannidis教授团队发布的“2021年度科学影响力排行榜”和“终身科学影响力排行榜(1960—2021)”的榜单上,在建筑和建造领域分别排名第2和第4,2001年、2007年和2016年分别当选为国际能源研究会、美国混凝土学会及国际材料与结构联合会的会士。cshi@hnu.edu.cn
引用本文:
陈聪聪, 吴泽媚, 胡翔, 史才军. 钢纤维形状和养护制度对超高性能混凝土强度及韧性的影响[J]. 材料导报, 2024, 38(15): 23030088-11.
CHEN Congcong, WU Zemei, HU Xiang, SHI Caijun. Influence of Steel Fiber Shape and Curing System on Strength and Toughness of UHPC. Materials Reports, 2024, 38(15): 23030088-11.
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2024, Vol. 38 
