无机系的抗收缩剂,典型的有生成钙矾石以缓和收缩。这意味着膨胀材料是抗收缩剂的一种。为此,介绍近年来以有机表面活性剂为主要成分的混和剂。这种混和剂不是发生膨胀反应的生成物,在干燥条件下能起减低收缩应力,是直接地减少干燥收缩的。1. 基本性能和原理抗收缩剂是一种非离子型的表面活性剂,溶解于水后,有降低水的表面张力的作用。混凝土用抗收缩剂必须具有以下性质: (1) 强碱溶液中能显示表面活性剂的效果; Inorganic anti-shrinkage agents typically produce ettringite to ease shrinkage. This means that the swelling material is one of the anti-shrinkage agents. To this end, a blending agent containing an organic surfactant as a main component has been introduced in recent years. This mixture is not a product of the expansion reaction. It can reduce the shrinkage stress under dry conditions and directly reduce the drying shrinkage. 1. Basic Properties and Principles An anti-shrinkage agent is a non-ionic surfactant that dissolves in water to reduce the surface tension of water. Antishrinkage agents for concrete must have the following properties: (1) The effect of surfactants can be demonstrated in strong alkali solutions;