CHEMICAL ADMIXTURES FOR CONCRETE AND ADDITIVES FOR THE CHEMICAL ADMIXTURES

摘要

PURPOSE: A chemical admixture for concrete is provided to reduce construction period by reducing solidification time of concrete by including methyl diethanol amine and sodium thiocyanate as an additive. CONSTITUTION: A chemical admixture for concrete comprises one or more selected from polycarboxylic acid-based salt, natalrene sulfonate, lignin sulfonate, and melanin sulfonate as a main ingredient. The chemical admixture for concrete comprises 1-50 weight% of methyl diethanol amine and 1-30 weight% of sodium thiocyanate. A manufacturing method of the methyl diethanol amine comprises a step of conducting deodorizing process and impurity-removing process on waste methyl diethanol amine after desulfurization.