混凝土中钙矾石的重结晶

Ettringite Rerystallization in Concrete

钙矾石是水泥重要的水化产物之一,也是铝酸盐类膨胀剂产生膨胀的主要物质,但它在混凝土中并不稳定,容易发生重结晶。提出了混凝土中钙矾石重结晶的理论基础,并从钙矾石的溶解和析晶两方面探论了混凝土中钙矾石重结晶的影响因素,重点讨论了混凝土原料组分中碱和石膏对钙矾石析晶的影响。此外,还概述了钙矾石重结晶与膨胀之间的关系。最后,提出了一些有待进一步研究的问题。

Ettringite is one of the important hydration products of cement and it is also the main component of aluminate expansive agent. Ettringite is not stable in concrete, however,it always tends to recrystallize. In this paper, the theory foundation of ettringite recrystallization and the factors affecting ettringite recrystallization are discussed. The effect of alkali and gupsum in concrete are studied particularly. In addition, the relationgship between ettringgite recrystallization and expansion is also summaried and some problems to be solved are proposed.