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一、简介 近年来人们已把外加剂当成混凝土的第五种材料(混凝土是由水泥、砂、石、水四种材材组成),它应用于混凝土,在建筑中起着重要的作用,它可应用被洪水等灾害造成铁路于混凝土桥墩、桥台抢修等工程施工。应用混凝土中的外加剂,它包括早强剂、引气剂、减水剂等,FDN系列型号外加剂是一种高效能减水剂。FDN是一以B—萘磺酸甲醛高缩合物钠盐为主要成份的高效能减水剂。
I. INTRODUCTION In recent years, people have considered additive as the fifth material of concrete (concrete is composed of cement, sand, stone, and water). It is applied to concrete and plays an important role in construction. Can be applied to floods and other disasters caused by the construction of railways in concrete piers, abutments and other repairs. Application of admixtures in concrete, including early strength agents, air-entraining agents, water-reducing agents, etc., FDN series model admixture is a high-efficiency water-reducing agent. FDN is a high-efficiency water-reducing agent based on sodium salt of B-naphthalenesulfonic acid-formaldehyde high-condensate.