一、根据工程特点选用合适的外加剂几乎各种混凝土都可以掺用外加剂,但必须根据工程需要、施工条件和施工工艺等选择合适的外加剂。如一般混凝土主要采用普遍减水剂,早强、高强混凝土采用高效减水剂,气温高时,掺用引气性大的减水剂或缓凝减水剂,气温低时,一般不用单一引气型减 First, according to the characteristics of the project to choose the right admixture Almost all kinds of concrete can be mixed with admixtures, but must be based on project needs, construction conditions and construction techniques to choose the right admixture. Such as general use of general water-based concrete superplasticizer, early strength, high strength concrete superplasticizer, the temperature is high, with air-entraining large superplasticizer or retarding superplasticizer, the temperature is low, the general need for a single lead Gas reduction