CAJ | 학술논문

为研究高强混凝土遭遇火灾后产生的损伤破坏情况,根据红外热像检测原理,对高温作用后的素混凝土和聚丙烯纤维混凝土进行红外检测,并进行了抗压强度试验。通过对试验结果的分析计算,建立了掺聚丙烯纤维前后的高强混凝土试块红外热像平均温升与受火温度和抗压强度损失率的关系。分析结果表明,随受火温度的升高,素混凝土和聚丙烯纤维混凝土的红外热像平均温升基本上处于上升趋势,而抗压强度降低,500℃时强度损失率达到50%,600℃以后,聚丙烯纤维混凝土的强度损失率更是达到75%左右,表明试块损伤趋于严重。通过建立平均温升与受火温度、抗压强度比之间的回归方程,可鉴定火灾后混凝土的火灾温度、结构损伤程度,有利于及时修复灾后建筑物。
위연구고강혼응토조우화재후산생적손상파배정황,근거홍외열상검측원리,대고온작용후적소혼응토화취병희섬유혼응토진행홍외검측,병진행료항압강도시험。통과대시험결과적분석계산,건립료참취병희섬유전후적고강혼응토시괴홍외열상평균온승여수화온도화항압강도손실솔적관계。분석결과표명,수수화온도적승고,소혼응토화취병희섬유혼응토적홍외열상평균온승기본상처우상승추세,이항압강도강저,500℃시강도손실솔체도50%,600℃이후,취병희섬유혼응토적강도손실솔경시체도75%좌우,표명시괴손상추우엄중。통과건립평균온승여수화온도、항압강도비지간적회귀방정,가감정화재후혼응토적화재온도、결구손상정도,유리우급시수복재후건축물。
For the study of damage of high-strength concrete subjected to fire, according to the prin-ciple of infrared thermal image, plain concrete and polypropylene fiber reinforced concrete subjected to high temperature were tested, and compressive strength tests were carried out. Based on the anal-ysis and calculation, the relationship among the average temperature rise of infrared thermal image, the fire temperature and the strength loss of the high-strength concrete before and after introducing polypropylene fiber was established. Analysis results show that with the rise of fire temperature, the average temperature infrared thermal image of plain concrete and polypropylene fiber concrete basi-cally rises, but the compressive strength reduces. After 500 ℃, the strength loss rate reaches 50%. After 600 ℃, the strength loss rate of the polypropylene fiber concrete reaches 75%, which indi-cates that the damage becomes more serious. Through establishing the regression equation between the average temperature and the fire temperature, the ratio of compressive strength, the fire tempera-ture of concrete and the structure damage can be identified, which is conducive to repairing build-ings.