约束程度与混凝土早期开裂敏感性评价

RESTRAINT DEGREE AND EVALUATION OF CRACKING SENSITIVITY IN EARLY CONCRETE

收缩变形是混凝土早期开裂的驱动力,然而是否会发生开裂还与约束条件密切相关。此外,初龄期混凝土力学性质的发展也受约束程度影响。采用了单轴约束试验方法,分析了不同约束程度下混凝土约束应力、松弛性质和弹性模量的发展,并讨论了约束程度对早期开裂敏感性评价的影响。

Shrinkage deformation is a driving force to stress generation and cracking in early concrete, whereas the occurrence of cracking depends on the restraint condition. Furthermore, the degree of restraint greatly affects the mechanical properties of early concrete. The developments of restraining stress, creep behavior and elastic modulus in concrete were measured under different restraint degrees by uniaxial restrained shrinkage test, and the influence of restraint degree on evaluation of cracking sensitivity in early concrete was also discussed.