一、外加剂生产应用概述我国开始生产和应用减水剂的时间与日本相近,可分为三个阶段。从解放初期到五十年代末为第一阶段,这个时期主要是为满足水工、港口工程需要而生产的以松香热聚物为主要成份的加气剂,以及为改善混凝土和易性、适当提高混凝士强度的亚硫酸纸浆废液为主的减水剂。六十年代初期到七十年代初是低潮时间,产品有国家建筑科学研究 First, the application of additive production Overview China’s production and application of water reducer time is similar to Japan, can be divided into three phases. From the early days of liberation to the end of the 1950s, it was the first phase. This period was mainly used to meet the needs of hydro industry and port engineering. It was produced with rosin hot polymer as the main ingredient of the air-entraining agent, and it was suitable for improving the workability of concrete. Improve the strength of sulfite pulp sulfite-based liquid superplasticizer. From the early 1960s to the early 1970s, it was low time and the products had national building scientific research.