摘要
用直接加温度应力的含裂缝圆环试件，对混凝土、砂浆早期温度断裂韧性进行了实验研究。根据实验测得的裂缝扩展时的温度边界条件，结合边界元数值计算，可获得混凝土、砂浆的温度断裂韧性。提出了应变强度因子的概念。实验结果给出了砂浆的ＫＩＣ以及混凝土不同龄期的应力ＫＩＣ及应变ＫＩＣε。实验表明，作者提出的应变强度因子及应变断裂韧性的概念对反映混凝土材料的断裂特性更稳定更具实际意义。研制了混凝土温度断裂研究专用的温度加载、自动采集、控制系统，编写了专用软件。
The thermal fracture toughness of the concrete and mortar in early ages was studied with cracked cylinder specimen loaded directly by thermal stress. According to the temperature boundary conditions which were tested when the crack begins to propagate in the experiments,the thermal fracture toughness (thermal KIC) can be obtained through the corresponding calculation by the boundary element method. The conception of strain intensity factorKIε was introduced. The experimental results of the thermal KIC and KIC of the concrete and mortar specimens with different ages were given. The experimental results show that foe values of strain intensity factor and strain fracture toughness are more stable and useful or determining the thermal fracture property of the concrete. A special automatic test system with thermal load control and its application software were developed for the thermal fracture study of concrete.
出处
《清华大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
1996年第1期95-101,共7页
Journal of Tsinghua University(Science and Technology)
关键词
温度
断裂韧性
混凝土
砂浆
应变强度因子
thermal fracture toughness
concrete
mortar
strain intensity factor
strain fracture toughness
