减水剂和膨胀剂对混凝土早期收缩影响研究

Study on the influence of water-reducing agent and expanders to early shrinkage of concrete

混凝土是土木工程中应用最广、用量最大的材料之一,它具有来源方便、承载能力强、耐久性好等特点,而随着混凝土技术的发展,各种外加剂的大量使用,混凝土早期收缩引起的开裂成为了一个重要问题。从掺减水剂和膨胀剂的混凝土入手,研究养护龄期、养护时间和养护措施等因素对混凝土早期收缩的影响,探究了外加剂的作用机理,提出了比较合理养护制度,有效的控制了混凝土早期收缩,为混凝土耐久性研究提供依据。

Concrete is the most widely used and one of the largest amount of material in civil engineering,it has many features, such as convenient source, high load capacity, good durability, but with the development of concrete technology, the extensive use of various additives, concrete early shrinkage cracking become an important issue.From the mixed water-reducing agent and expansive concrete to study the effect of curing period, cur- ing time and concrete conservation measures and other factors on early contraction, then to explore the mechanism of action of additives,made a more reasonable maintenance system to control the early shrinkage of concrete effectively, provide the basis for the study of concrete durability.