▎ 摘　　要

NOVELTY - Modified slump retaining mother liquor comprises 20-60 pts. wt. graphene oxide dispersion liquid, 300-360 pts. wt. isopentenol polyoxyethylene ether, 2.5-3 pts. wt. hydrogen peroxide, 38-40 pts. wt. acrylic acid, 50-55 pts. wt. hydroxyethyl acrylate, 1.2-1.5 pts. wt. ascorbic acid, 2-2.5 pts. wt. mercaptopropionic acid and 25-35 pts. wt. sodium hydroxide. USE - Used as modified slump retaining mother liquor. ADVANTAGE - The mother liquor has high slump-preserving performance without increasing the sensitivity. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are also included for: (1) preparing modified slump retaining mother liquor, comprising (i) taking solid graphene oxide and water to prepare graphene oxide dispersion, or taking commercial graphene oxide dispersion liquid, diluting with water, carrying out ultrasonic dispersion for 30 minutes to obtain 7.4 plus minus 0.2 g/liter a graphene oxide dispersion, taking solid sodium hydroxide, adding water to prepare, or taking a commercial sodium hydroxide solution product and dilutiung with water to obtain a 5 mol/liter sodium hydroxide solution, (ii) taking 20-60 pts. wt. graphene oxide dispersion liquid, 300-360 pts. wt. isopentenol polyoxyethylene ether, 2.5-3 pts. wt. hydrogen peroxide, 38-40 pts. wt. acrylic acid, 50-55 pts. wt. hydroxyethyl acrylate, 1.2-1.5 pts. wt. ascorbic acid, 2-2.5 pts. wt. mercaptopropionic acid and 25-35 pts. wt. sodium hydroxide, adding the graphene oxide dispersion liquid, hydrogen peroxide, adding graphene oxide dispersion and water into the reactor, controlling to react at 35 degrees C and reacting for 1 hour under stirring conditions of 300 plus minus 50 revolutions/minute, (iii) maintaining the reaction temperature and stirring conditions, adding acrylic acid, hydroxyethyl acrylate, ascorbic acid and mercaptopropionic acid solution drop wise at a uniform rate into the reactor and controlling dripping time within 2.5 hours plus minus 10 minute and (iv) stirring continuously for 1 hour, cooling to room temperature, adding sodium hydroxide solution into the reactor to adjust the pH value of 6.8-7.2 and mixing evenly; and (2) application of modified slump retaining mother liquor comprises the mixing amount of modified slump retaining mother liquor is 0.3-0.4 wt.% of the cement when preparing the pure slurry or when preparing mortar, the blending amount of modified slump retaining mother liquor is 0.3-0.5 wt.% of cement weight or when preparing concrete, the mixing amount of modified slump retaining mother liquor is 0.4-0.6 wt.% of cement weight.