Method for preparing concrete superplasticizer having phosphorous acid group and use thereof

A method for making a cement concrete binder, comprising

• using a concrete superplasticizer having a phosphorous acid group at a concentration of 0.05%-0.3% of the total weight of the cement concrete binder, wherein the
• the concrete superplasticizer having a phosphorous acid group is prepared by the following method, comprising
• performing a free radical copolymerization between a phosphorous-containing monomer A and a polyether macromonomer B,
• wherein
• the monomer A has a structure represented by a general formula (1):
• in which R1 is H or CH3, n is an integer from 0 to 6, M is a hydrogen atom, an alkali metal ion, an alkaline-earth metal ion, ammonium ion, or an organic amine group;
• the monomer B is represented by a general formula (2):
• in which R2 represents H or CH3;
• X═O, CH2O, or CH2CH2O;
• p represents an average addition mole number of ethylene oxide and is an integer from 20 to 90;
• and
• a molar ratio of the monomer A:the monomer B is 3 to 8:1.