Shandong gresea building materials co., ltd , one of the major manufacturers of concrete admixtures in china, was established in 2000, in yucheng city, shandong. it is specialized in concrete admixtures' research, manufacturing, and distribution. the company is one of the key businesses in china exporting concrete superplasticizers. gresea produces over 70 products, including high range water reducer, set accelerators, set retarders, anti-freezing products, etc..