摘要
为研究高温后高性能混凝土性能的变化规律,设计了7组C60高性能混凝土进行不同温度和不同冷却方式的试验,研究高性能混凝土高温后的强度变化规律,并采用核磁共振测试混凝土微观孔结构特征,以分析高温作用对混凝土微观孔结构的劣化机理。试验数据表明,随试验温度的增加混凝土T_(2)谱各峰值峰面积与总峰面积均呈现增大趋势,即随试验温度的增加混凝土孔隙结构出现明显劣化;混凝土强度值随试验温度的升高呈现降低趋势,且在浸水冷却后的降低幅度明显大于自然冷却。
In order to study the change law of HPC properties after high temperature, seven groups of C60 HPC tests were conducted at different temperatures and by different cooling methods. To study the strength change law of HPC after high temperature, nuclear magnetic resonance technology was used to test the micro pore structural characteristics of concrete, based on which the degradation mechanism of micro pore structure of concrete under high temperature was analyzed. The testing data demonstrate that with the increase of testing temperature, every peak area or total peak area of the concrete T_(2)spectrum has an increasing trend;the concrete pore structures deteriorate significantly;the concrete strength values show an decreasing trend and the reduction range after immersion cooling is obviously greater than that after natural cooling.
作者
周欢
ZHOU Huan(Guangxi Vocational College of Water Resources and Electric Power,Nanning 530023,China)
出处
《广西水利水电》
2022年第5期15-18,共4页
Guangxi Water Resources & Hydropower Engineering
关键词
高性能混凝土
高温
自然冷却
浸水冷却
力学性能
孔结构
High performance concrete(HPC)
high temperature
natural cooling
immersion cooling
mechanical properties
pore structure
