Method for preparing anti-sludge type concrete water reducing agent

Abstract

The invention provides a method for preparing an anti-sludge type concrete water reducing agent. The method comprises the following steps: I, preparing the following components in percentage by weight: 9% of maleic anhydride, 3.5% of crylic acid, 8.5% of acrylic amide, 7% of sodium dodecyl benzene sulfonate, 5.5% of potassium permanganate, 2% of sodium hydroxide, 3% of water-soluble dextrin, 4% of propylene glycol monomethyl ether and the balance of water, adding a part of the water into a reaction kettle, heating to 80-90 DEG C, and adding the maleic anhydride; II, after the maleic anhydride is stirred and mixed uniformly, sequentially adding the sodium dodecyl benzene sulfonate, the crylic acid and the acrylic amide; III, heating the solution to 90-95 DEG C under a sealed condition, and keeping the temperature for 1.5 hours; III, cooling the solution to 40-45 DEG C, sequentially adding the propylene glycol monomethyl ether and the potassium permanganate, and continuously stirring for 30 minutes; IV, cooling the solution to 25-30 DEG C, sequentially adding the water-soluble dextrin, the sodium hydroxide and the water, and continuously stirring for 20 minutes, thereby obtaining the anti-sludge type concrete water reducing agent.

Description

Technical field [0001] The invention relates to the technical field of concrete admixtures, in particular to a method for preparing a mud-resistant concrete water reducer. Background technique [0002] Compared with naphthalene-based, aliphatic, sulfonated melamine and other water-reducing agents, the advantages of polycarboxylic acid-based water-reducing agents are: good slump retention; under the same fluidity, it has less impact on cement setting time, and can Effectively solve the problems of water reduction, air entrainment, retardation, bleeding, etc.; more slag or fly ash can be used to replace cement, thereby reducing the cost; no harmful substances such as formaldehyde, naphthalene, etc., will not cause environmental pollution, etc. At the same time, compared with other water-reducing agents, polycarboxylate water-reducing agents have higher requirements for the mud content of aggregates, and the water-reducing rate of polycarboxylate water-reducing agents decreases due ...

AI Technical Summary

Problems solved by technology

During the concrete mixing process, the polycarboxylate superplasticizer is partially absorbed by the clay, and the adsorbed superplasticizer loses its water-reducing function, so that the water-reducing rate of the polycarboxylate superplasticizer decreases. As the amount of mud increases, the adsorbed water reducing agent also increases, so the water reducing rate decreases with the increase of mud content in the aggregate, and the slump protection effect becomes worse.