PENGARUH PENAMBAHAN SERAT BAJA TERHADAP SIFAT MEKANIS REACTIVE POWDER CONCRETE

S. Lewa, P. Kusumaningrum
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Abstract

As urban growth increase, massive high-rise building construction become a critical solution. In high-rise building, column base may be subjected to very high axial load from the upper stories and may experience very large moment due to the lateral loads. As a result, the column base requires a great deal amount of reinforcement which make it very cramped. In order to prevent honeycomb as the reinforcement gap is narrow yet difficult to provide sufficient vibration during concrete casting, high performance concrete (HPC) may be the solution. One of the HPC innovations is Reactive Powder Concrete (RPC). RPC is a self-compacting type of HPC contains well graded fine and super fine aggregates with cement and pozzolanic material to strengthen the Interfacial Transition Zone (ITZ) between the mortar matrix and fine aggregates. RPC may achieve high compressive strength as the mix uses low water to cement ratio, thus it introduces less void and no coarse aggregates, thus ITZ is stronger. RPC has similar characteristic as concrete, with its brittle behaviour. To avoid the brittle failure of RPC, in this study steel fibers are added into the RPC mixture. This research is conducted to examine the effectiveness of using steel fibers on the mechanical properties of Steel Fiber Reactive Powder Concrete (SFRPC). The steel fiber is aimed to increase ductility of tensile strain hardening condition by its multiple crack-bridging behavior.
随着城市的增长,大规模的高层建筑建设成为一个关键的解决方案。在高层建筑中,柱基础可能承受来自上层的非常高的轴向荷载,并可能由于侧向荷载而经历非常大的弯矩。因此,柱基需要大量的加固,这使得它非常狭窄。在混凝土浇筑过程中,由于钢筋间距窄且难以提供足够的振动,为防止蜂窝的产生,高性能混凝土(HPC)可能是解决方案。活性粉末混凝土(RPC)是高性能混凝土的创新之一。RPC是一种自密实型高性能混凝土,含有级配良好的细、超细骨料,水泥和火山灰材料加强砂浆基体与细骨料之间的界面过渡区(ITZ)。RPC可获得较高的抗压强度,因为混合料采用低水灰比,因此产生的孔隙少,无粗集料,因此ITZ更强。RPC具有与混凝土相似的脆性特性。为了避免RPC的脆性破坏,本研究在RPC混合料中加入钢纤维。研究了钢纤维对钢纤维活性粉末混凝土力学性能的影响。钢纤维利用其多重裂纹桥接特性来提高拉伸应变硬化条件下的延性。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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