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搅拌混凝土混合物(水泥、骨料、水)时,如果加入一些少量具有表面活性的物质,就可以改善混凝土混合物的流动性及硬化后的性能,这些表面活性物质通常叫外加剂,或掺合剂。外加剂的掺入数量,要根据试验确定,不能任意使用。常用的外加剂有以下几种: 一、可调节混凝士硬化速度的外加剂 1.促凝剂。混凝土混合物中加入促凝剂后能加速硬化。常用的有氯化钙CaCl_2,食盐NaCl。氯盐中的氯离子能参与反应,与水泥中的硅酸三钙3CaO·SiO_2生成含水的氯硅酸钙3CaO·SiO_2·CaCl_2·nH_2O、氯铝酸钙3CaO·Al_2O_3·
Mixing concrete mixes (cement, aggregates, water) can improve the fluidity and hardened properties of concrete mixtures if added with minor amounts of surface-active substances, commonly referred to as admixtures or admixtures. Admixture of the number of incorporation, according to the test to determine, can not be used arbitrarily. Commonly used admixtures are the following: First, the adjustable coagulation hardening accelerator 1. Accelerator. Concrete mix to accelerate the hardening accelerator after adding accelerators. Commonly used calcium chloride CaCl2, salt NaCl. The chloride ion in the chloride salt can participate in the reaction, and the calcium silicate 3CaO · SiO 2 · CaCl 2 · nH 2 O and calcium calcium aluminate 3CaO · Al 2 O 3 · 3