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Development of impact resistant high-strength strain-hardening cementitious composites (HS-SHCC) superior to reactive powder concrete (RPC) under flexure
Journal of Building Engineering ( IF 6.7 ) Pub Date : 2021-05-04 , DOI: 10.1016/j.jobe.2021.102652
Min-Jae Kim , Hong-Joon Choi , Wonsik Shin , Taekgeun Oh , Doo-Yeol Yoo

The drop-weight impact behavior of the ductility enhanced high-strength strain-hardening cementitious composites (dHS-SHCC) is compared to that of conventional reactive powder concrete (RPC) to validate its super-impact resistance. All materials have an identical fiber volume fraction of 2%. The compressive strengths of RPC and dHS-SHCC are approximately 210 and 115 MPa, respectively. RPC has the highest ultimate tensile strength of 17.9 MPa, while the developed dHS-SHCC has the highest tensile strain capacity and energy absorption capacity up to the peak (g-value) of 5.9% and 526.0 kJ/m3, respectively. It also absorbs 3.2 times higher energy up to the peak under flexure (toughness) as compared to that of RPC. The RPC beams completely fail upon impact of a drop hammer with a potential energy of 490 J. However, the dHS-SHCC beams are only partially damaged along with multiple microcrack formations and rebounds. Moreover, it produces at least four times the microcracks and is more sensitive to the strain-rate than those of RPC. Consequently, it can be determined that using developed dHS-SHCC is effective in resisting impact loads as compared to RPC.



中文翻译:

抗弯曲性能优于反应性粉末混凝土(RPC)的抗冲击高强度应变硬化水泥复合材料(HS-SHCC)的开发

延展性增强的高强度应变硬化水泥基复合材料(dHS-SHCC)与常规反应性粉末混凝土(RPC)的跌落冲击行为进行了比较,以验证其超抗冲击性。所有材料的纤维体积分数相同,均为2%。的压缩强度RPC和DHS-SHCC的是大约210和115兆帕,分别。RPC的最高极限抗拉强度为17.9 MPa,而发达的dHS-SHCC则具有最高的拉伸应变能力和能量吸收能力,最高可达峰值(G值)分别为5.9%和526.0 kJ / m 3 与RPC相比,它在弯曲(韧性)下的峰值处吸收的能量也高3.2倍。RPC梁在落锤的冲击下完全失效,势能为490J。但是,dHS-SHCC梁仅被部分损坏,并形成了多个微裂纹和回弹。此外,它产生的微裂纹至少是RPC的四倍,并且对应变率更敏感。因此,可以确定,与RPC相比,使用开发的dHS-SHCC可有效抵抗冲击载荷。

更新日期:2021-05-11
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