... drying concentrated formed. Product is light yellow (brown) free flowing powder, soluble in water, chemically stable, long-term sealed storage ... 20-0.30% with cement,0.25% is recommend .2 Powder can directly add to cement, sand, gravel ,and then mix ... stirring after it regularly, mixing time should be appropriately extended3 Powder can be prepared in advance with a certain concentration liquor, and ...