Improvement of phosphate ester grinding aids on cement grinding and water-reducing performance

Abstract

Phosphate ester polymers were prepared from phosphate ester monomers for the first time, and their effects on cement grinding and water-reducing as grinding aids were studied. FT-IR, standard viscosity, setting time, mortar fluidity, mortar compressive strength, etc., tested phosphorus series products’ properties. The results show that: (1) Dibutyl hydroxyethyl phosphate can reduce the residue of 45 μm and 80 μm grinding sieves by 68.67% and 98.67%, respectively. (2) By comparing with triethanolamine (TEA). It is found that the grinding effect of hydroxyethyl dibutyl phosphate is not only better, but also the optimal mixing amount is smaller, only 0.167%. Under the same grinding amount, the grinding time can be shortened by 30%, and under the same grinding time, the grinding output can be increased by at least 20%. (3) Polymer grinding aids can significantly improve the fluidity of cement paste by 40.06%, which can make the water-reduction rate of cement mortar reach more than 20%. The experimental results show that as a new generation of grinding aids system, phosphate ester grinding aids not only have a significant grinding effect but also have high molecular designability, which will significantly enrich the grinding aids market and effectively promote energy conservation and emission reduction in the grinding field.