▎ 摘　　要

NOVELTY - The cement-based material of modified graphene comprises 300-400 pts. wt. cement, 60-80 pts. wt. fly ash with the particle diameter of 50-80 µm, 100-200 pts. wt. silica fume with the particle diameter of 5-10 µm, 500-700 pts. wt. river sand with the particle size of 1-5 mm, 20-50 pts. wt. modified graphene, 30-40 pts. wt. polycarboxylic acid high-efficiency water reducing agent, and 60-100 pts. wt. water. USE - Cement-based material of modified graphene. ADVANTAGE - The modified graphene can be stored in a solid state, and can be used only by being dispersed in water during field construction, so that the modified graphene is more beneficial to construction and better ensures construction progress and efficiency. DETAILED DESCRIPTION - The cement-based material of modified graphene comprises 300-400 pts. wt. cement, 60-80 pts. wt. fly ash with the particle diameter of 50-80 µm, 100-200 pts. wt. silica fume with the particle diameter of 5-10 µm, 500-700 pts. wt. river sand with the particle size of 1-5 mm, 20-50 pts. wt. modified graphene, 30-40 pts. wt. polycarboxylic acid high-efficiency water reducing agent, and 60-100 pts. wt. water. The modified graphene is prepared by: dispersing 200-300 g of commercially purchased graphene nanosheets in 5-10 mL of triethanolamine and 500-600 mL of water mixed solution, and stirring for 30-60 minutes to obtain a first mixed solution with the pH value of 9.5-10.5; raising the temperature to 50-60 ℃, slowly adding 20-50 mL of polymethylhydrosiloxane into the first mixed solution for reaction, continuously stirring in the reaction process to obtain a second mixed solution, standing and aging the second mixed solution for 3-5 hours, filtering and separating to obtain a solid mixture, washing with water, acetone and water in sequence, and drying; dissolving 0.1-0.5 mol of polyethylene glycol in 200-400 mL of toluene solvent, heating to 60-80 ℃ in an inert atmosphere environment, slowly adding the solid mixture, and reacting for 2-5 hours under stirring to obtain a third mixed solution; filtering the third mixed solution, and taking the solid mixture to disperse in the propanol; filtering again, and dispersing the solid mixture in water; filtering and drying. An INDEPENDENT CLAIM is included for a preparation method of the cement-based material of modified graphene.