Study on static and dynamic mechanical properties of concreteafter high temperature
WANG Yu-tao1，LIU Dian-shu1，LI Sheng-lin1，FENG Ya-fei2
1.School of Mechanics & Civil Engineering, China University of Mining and Technology (Beijing), Beijing 100083, China；2.The Nuclear Northwest Construction Group Co., Ltd. Xian 710054, China
摘要用高温加热系统对C30、C50两种强度等级混凝土在不同温度条件下进行均匀加热，经自然冷却后用Φ75 mm SHPB实验装置、超声波测量技术及试验压力机对高温前后混凝土试件进行动态冲击与静态抗压试验。结果表明，随温度升高纵波波速、弹性模量及静态抗压强度均出现不同程度减小，总体趋势一致；损伤随温度升高不断增大，在温度400℃、700℃处为明显变化转折点；经不同高温冷却后，混凝土动态破坏强度不断降低、峰值应变不断增大、应力-应变曲线趋平缓，出现塑性流动现象且随温度升高愈加明显。
Abstract：Through the high temperature heating system of C30 and C50 two kinds of strength grade of concrete under different temperature conditions of uniform heating and after natural cooling, using Φ 75 mm SHPB experiment device, ultrasonic measurement technology and test press to impact dynamic and static compression test of concrete specimens before and after the high temperature. The experimental results showed that: With the increase of temperature, vertical wave, static compressive strength and elastic modulus are both the decrease of the different degree,the overall trend is consistent.Damage increased with the temperature increasing and the temperature of 400 ℃ and 700 ℃ is the turning point of its obvious change;After different high temperature cooling, the dynamic damage of concrete strength is decreasing but the peak of strain is increasing.Stress-strain curve becomes more smooth and the plastic flow phenomenon, this phenomenon with the rising of temperature is more and more obvious.
王宇涛;刘殿书;李胜林;冯亚飞. 高温后混凝土静动态力学性能试验研究[J]. , 2014, 33(20): 16-19.
WANG Yu-tao;LIU Dian-shu;LI Sheng-lin;FENG Ya-fei. Study on static and dynamic mechanical properties of concreteafter high temperature. , 2014, 33(20): 16-19.
2014, Vol. 33 
