Abstract: In order to prevent the crack of concrete,many mass concrete takes dry shrinkage as an important index of crack resistance.In this paper,we analysis the influencing factors and measures of decreasing it.We can decrease the dry shrinkage of concrete by choosing cement,adding fly ash and fibre,increase content of aggregate and choose additions,which can improve crack resistance of concrete and can be used as reference in project.?

摘要： 为了防止混凝土发生裂缝，许多大体积混凝土在设计中提出抗裂要求，干缩是混凝土抗裂能力的重要指标。本文主要研究影响混凝土干缩的因素及降低混凝土干缩的措施。通过选择水泥品种、掺用粉煤灰和纤维、提高混凝土骨料含量、选择适当的外加剂等方式，能降低混凝土的干缩变形，从而提高混凝土抗裂性能，为工程实践提供参考。