第四届全国混凝土外加剂学术交流会于1990年10月29日至11月3日在青岛市召开,有来自全国各地的197名代表参加了会议。共有87篇论文在会上进行了交流,内容有防冻剂、早强剂、减水剂、引气剂、泵送剂,膨胀剂,防水剂、脱模剂,养护剂,缓凝剂、阻锈剂和抗分散剂等。学术交流会后,还召开了中国混凝土外加剂协 The 4th National Academic Forum on Concrete Admixture was held in Qingdao from October 29 to November 3, 1990. 197 delegates from all over the country attended the conference. A total of 87 papers were exchanged at the meeting, including antifreeze, early strength agent, water reducer, air-entraining agent, pumping agent, swelling agent, waterproof agent, release agent, curing agent, retarder, and resistance. Rust and anti-dispersants. After the academic exchange meeting, the China Concrete Admixture Association was also held.