摘要
研究了钢纤维体积掺量(0、0.5%、1.0%、1.5%)以及温度(25、105、200、300、400℃)对重晶石混凝土(BC)质量损失、抗压强度、劈裂抗拉强度及超声波波速的影响,建立了高温作用后钢纤维BC的损伤演化曲线和超声波波速与强度的关系曲线。结果表明:随温度的升高,BC的质量损失逐渐增加,抗压强度、劈裂抗拉强度及超声波波速均逐渐下降;掺入钢纤维可提高BC的抗压及劈裂抗拉强度,对劈裂抗拉强度的影响较大;BC的超声波波速与强度的拟合度较高,可用超声无损检测技术评估BC高温作用后的受损程度。
This experiment tested and analyzed the effects of different volume admixtures of steel fibers(0,0.5%,1.0%,1.5%)and different temperatures(25,105,200,300,400℃)on the mass loss,compressive strength,splitting tensile strength and ultrasonic wave velocity of barite concrete,and established the damage evolution curve of steel fiber barite concrete and the relationship curve between ultrasonic wave velocity and strength after high temperatures.The results showed that the mass loss of barite concrete specimens gradually increased with the increase of temperature.The compressive strength,splitting tensile strength and ultrasonic wave velocity gradually decreased.The incorporation of steel fiber could improve the compressive strength and splitting tensile strength of barite concrete,among which the effect on the splitting tensile strength of specimens was greater.The ultrasonic wave velocity and strength of barite concrete fitted well,and ultrasonic nondestructive testing technique could be used to assess the damage degree of barite concrete after the high-temperature action.
作者
刘财山
陈振富
吴旦
陶秋旺
谢利平
LIU Caishan;CHEN Zhenfu;WU Dan;TAO Qiuwang;XIE Liping(School of Civil Engineering,University of South China,Hengyang 421001,China;Hunan Provincial Key Laboratory of High Performance Special Concrete,Hengyang 421001,China;CNNC Key Laboratory of Civil Engineering and Intelligent Building Structure,Hengyang 421001,China;Nuclear Industry 22ND Construction Company Ltd.,Wuhan 430051,China)
出处
《新型建筑材料》
2023年第10期11-16,共6页
New Building Materials
基金
国家自然科学基金项目(51678286)
湖南省教育厅科研项目(14C0971)。
关键词
重晶石混凝土
高温
钢纤维
质量损失
力学性能
超声波波速
barite concrete
high temperature
steel fiber
mass loss
mechanical properties
supersonic wave velocity
