高溫后玄武巖纖維混凝土抗壓強(qiáng)度與孔隙結(jié)構(gòu)變化規(guī)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
混凝土作為建筑材料被廣泛應(yīng)用于工程領(lǐng)域，同時(shí)建筑防火問(wèn)題也日益突出，而在火災(zāi)等高溫環(huán)境下，混凝土的孔隙結(jié)構(gòu)發(fā)生變化，內(nèi)部劣化嚴(yán)重，進(jìn)而導(dǎo)致混凝土的強(qiáng)度下降，對(duì)混凝土結(jié)構(gòu)造成不可逆的損傷，使結(jié)構(gòu)的使用壽命下降，其中孔隙結(jié)構(gòu)是混凝土重要的特征之一，混凝土的孔隙結(jié)構(gòu)對(duì)其宏觀(guān)力學(xué)性能有較大影響。（剩余5504字）