摘要
对近十年来国内外针对高性能混凝土收缩与限制收缩的研究工作进行了总结。混凝土的早期开裂与混凝土的收缩是密不可分的,从材料和工艺方面存在着诸多的影响因素。当收缩部分或全部受到约束时,混凝土内部的自生拉应力随之产生。混凝土在硬化早期表现为明显的粘弹性能,所以,在这一拉应力作用下,混凝土将随之产生蠕变。混凝土在早期是否开裂取决于收缩和蠕变的综合作用。
The research works on shrinkage and restrained shrinkage of concrete in the last decades were reviewed in this paper. Early age cracking has close relationships with shrinkage, and there are many factors that affect shrinkage. When shrinkage is partly or totally restrained,there will be self- induced tensile stress in concrete. At early age, high performance concrete shows typical viscoeiastic behavior; as a result, tensile creep occurs. The concrete cracks or not is the consequence of the joint effect of shrinkage and creep.
出处
《低温建筑技术》
2004年第3期14-15,63,共3页
Low Temperature Architecture Technology
关键词
收缩
限制收缩
蠕变
粘弹性能
shrinkage
restrained shrinkage
creep
viscoelastic behavior
