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本文主要研究了在静载、动载作用下,钢纤维硅灰高强混凝土的抗弯、劈拉、抗冲击与耐疲劳性能.研究了硅灰掺量对上述性能的影响规律和硅灰增强与钢纤维增强及其复合效应.实验结果充分表明,在其他条件不变时,不同数量的硅灰(SF)取代水泥,钢纤维硅灰高强混凝土的动、静力学行为均有显著提高.实验结果还充分表明,钢纤维、硅灰对高强混凝土改性的主要原因,是由于硅灰的掺入有效地产生了纤维与水泥基材、集料与水泥基材的双重界面强化效应,改善了界面结构与性状.当硅灰掺量适当时,H_v-d,I_a-d,CHAS-d曲线均趋于平直,消除了界面层与基材间的差异,从而使界面和整体裂缝源尺度变小、数量减少,纤维增强、硅灰微粒增强及其协同效应得到充分发挥.这是钢纤维硅灰高强混凝土产生优异特性的关键.
In this paper, the bending, splitting, impact and fatigue resistance of high-strength steel fiber reinforced silica-mortar under static loading and dynamic loading were studied.The effects of the content of silica fume on the above properties and the effects of silica fume enhancement and Steel fiber reinforced and its composite effect.The experimental results fully show that the static and dynamic behaviors of steel fiber reinforced high-strength concrete with silica fume replaced by different amounts of silica fume (SF) were significantly improved when the other conditions were unchanged.Experimental results It is also fully demonstrated that the main reason for the modification of high strength concrete with steel fiber and silica fume is that the addition of silica fume effectively produces the double interface strengthening effect between fiber and cement substrate, aggregate and cement substrate, and improves the interface Structure and character of the interface.When the content of silica fume is suitable, the curves of H_v-d, I_a-d and CHAS-d tend to be flat, and the difference between the interface layer and the substrate is eliminated, Small, the number of reduced, fiber-reinforced, silica fume particles enhanced synergies and give full play.This is the key to the excellent properties of steel fiber reinforced high-strength concrete silica fume.