Chemical additive for calcium sulphoaluminate-modified portland cement

A chemical additive for calcium sulphoaluminate-modified Portland cement comprises alkanolamine borate, organic alcohol, saccharide or its derivative, and water, wherein the mass ratio of the alkanolamine borate, the organic alcohol, the saccharide or the derivative and the water is (15-60):

• (3-30):
• (3-25):
• (15-60);
• wherein the alkanolamine borate is one or more compounds selected from a group consisting of diethanolisopropanolamine borate, N,N-di(2-hydroxypropyl)-N-(hydroxyethyl) amine borate and triisopropanolamine borate;
• the organic alcohol is one or more compounds selected from a group consisting of ethylene glycol, diethylene glycol, propylene glycol and glycerin;
• and the saccharide or the derivative is one or more compounds selected from a group consisting of saccharose, glucose, fructose, high fructose corn syrup, cane molasses and a salt of the above mentioned saccharide.