硅灰-聚丙烯纤维双掺混凝土的动静态力学性能

摘要/Abstract

摘要： 为了研究硅灰取代率和聚丙烯纤维掺量对混凝土力学性能的影响,采用WAW-1000型微机控制电液伺服万能试验机和分离式Hopkinson压杆(SHPB)进行试验,分析混凝土试件的动静态抗压强度、材料韧性、能量变化和破碎块度,得到不同配合比下的硅灰-聚丙烯纤维双掺混凝土力学性能。结果表明:随硅灰取代率(0%~9%,质量分数)的增加,双掺混凝土的动静态抗压强度和韧性先上升后下降;随聚丙烯纤维掺量(0~4 kg·m^-3)的增加,动静态抗压强度和韧性缓慢增长。掺入硅灰和聚丙烯纤维有利于提高混凝土的耗能效果和破碎块度质量比,透射能和破碎块度质量比随硅灰取代率的增加先增大后减小,随聚丙烯纤维掺量的增加而增大。硅灰加强了砂浆-粗骨料的界面结合,杂乱分布的聚丙烯纤维约束了裂纹的发展,两者的共同作用显著提高了混凝土的动静态抗压强度、韧性、抗冲击能力和抵抗破坏的能力。

关键词: 硅灰, 聚丙烯纤维, 混凝土, 动静态力学性能, 分离式Hopkinson压杆(SHPB)

Abstract: In order to research the effects of silica fume substitution rate and polypropylene fiber content on the mechanical properties of concrete, WAW-1000 microcomputer-controlled electro-hydraulic servo universal testing machine and split Hopkinson pressure bar (SHPB) were used to analyze the dynamic and static compressive strength, material toughness, energy change and fragmentation degree of concrete specimens, and the mechanical properties of silica fume-polypropylene fiber double doped concrete under different mix ratios were obtained. The results show that with the increase of silica fume substitution rate (0%~9%, mass fraction), the dynamic and static compressive strength and toughness of double doped concrete increase first and then decrease. The dynamic and static compressive strength and toughness increase slowly with the increase of polypropylene fiber content (0~4 kg·m^-3). The incorporation of silica fume and polypropylene fiber is conducive to improving the energy consumption effect of concrete and the mass ratio of fragmentation degree, and the transmission energy and mass ratio of fragmentation degree increase first and then decrease with the increase of silica fume substitution rate, and increase with the increase of polypropylene fiber content. The silica fume strengthens the interface bond between mortar and coarse aggregate, the messy distribution of polypropylene fiber restricts the development of cracks, and the combined effect of the two significantly improves the dynamic and static compressive strength, toughness, impact resistance and damage resistance of concrete.

Key words: silica fume, polypropylene fiber, concrete, dynamic and static mechanical property, split Hopkinson pressure bar (SHPB)

中图分类号:

TU528

李艳艳, 杜晓丽, 王浩伟, 徐锴. 硅灰-聚丙烯纤维双掺混凝土的动静态力学性能[J]. 硅酸盐通报, 2024, 43(9): 3320-3329.

LI Yanyan, DU Xiaoli, WANG Haowei, XU Kai. Dynamic and Static Mechanical Properties of Silica Fume-Polypropylene Fiber Double Doped Concrete[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2024, 43(9): 3320-3329.

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