高温后玄武岩纤维混凝土抗压强度与孔隙结构变化规律研究

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XU Hao，WANG Xiaolei，LIU Libo

（College of Civil Engineering Hebei University of Engineering，Handan O56O38，China）

Abstract：Soastochecktheporstructureandmechanicalpropertiesofvolanicrockfiberconcretewhenextremetemperatureinjury， andthereforetheinfluenceofporestructureonlargemechanicalproperteswenextreme temperature.during thispaper，volcanicrock fiber concrete with totally different volume content %，0.5%，1%，1.5% ） was treated at 200-800 自 .At the same time， saturatedwatermethodologwasacustomedlivetheporosityhentotallydiferenthightemperatures，andthereforethecopresive strengthfvolcanicrockfiberconcreteblockshentotallydiferenthightemperatureswastested.Theresultsshowthattheporosityof volcanicrock fiber concrete willincrease with the rise of temperature.Theporosity willicrease slowly when extreme temperature， and will increase quickly when 400 extreme temperature.The compressive strength initial enhanced then diminished.When 200 extreme temperature，the compressive strength reached the height，and when 800 extreme temperature，the compressive strength diminished sharply.

Keywords：concrete；basalt fiber；high temperature damage；pore structure

0 引言

混凝土作为建筑材料被广泛应用于工程领域，同时建筑防火问题也日益突出，而在火灾等高温环境下，混凝土的孔隙结构发生变化，内部劣化严重，进而导致混凝土的强度下降，对混凝土结构造成不可逆的损伤，使结构的使用寿命下降，其中孔隙结构是混凝土重要的特征之一，混凝土的孔隙结构对其宏观力学性能有较大影响。（剩余5504字）