混凝土早期开裂敏感性评价

Evaluation of cracking sensitivity of concrete at early age

温度变形和自生收缩变形等受约束形成的拉应力,是引起混凝土早期开裂的主要驱动力;单轴约束试验是试验室评价混凝土早期开裂敏感性的有效方法。文章通过温度-应力试验分析混凝土早期开裂的机理,并探讨了温度历程和自生收缩变形对混凝土开裂敏感性的影响。

The tensile stress induced by restrained thermal and autogenous shrinkage deformations was the main driving force of cracking in concrete at early age. The uniaxial restraint testing methods are effective to evaluate the cracking sensitivity of concrete at early age in laboratories. The mechanism of cracking in concrete was analyzed by temperature-stress tests, and the effects of the temperature histories and autogenous shrinkage deformations on cracking sensitivity of concrete were also discussed.