A coagulation-accelerating early-strength polycarboxylate water-reducer and its preparation method

Abstract

The invention discloses a coagulation-accelerating and early-strength polycarboxylate water-reducer and a preparation method thereof. The water-reducer is made of the following raw material components in parts by weight: a quaternary ammonium salt cationic monomer with terminal double bonds 1 ~3 parts by weight, polyether monomer 190~210 parts by weight, unsaturated monocarboxylic acid and its derivatives 16~18 parts by weight, oxidizing agent 1.5~2.0 parts by weight, first reducing agent 0.1~0.3 parts by weight, second reducing agent 0.1-0.3 parts by weight of agent, 0.8-0.9 parts by weight of chain transfer agent, 14-18 parts by weight of alkaline regulator and 210-230 parts by weight of water. The coagulation-accelerating early-strength polycarboxylate superplasticizer of the present invention has a prominent function of promoting cement hydration reaction, and can be used in steam-cured concrete, low-temperature environment concrete and concrete that requires early formwork removal, and can significantly shorten the forming formwork Excellent plastering and initial setting time, notable early strength effect, but also good thixotropic properties, which can speed up the construction progress of concrete and improve the turnover rate of formwork.

Description

technical field [0001] The invention belongs to the technical field of concrete admixtures, and in particular relates to a coagulation-accelerating early-strength polycarboxylate water-reducer and a preparation method thereof. Background technique [0002] With the acceleration of the construction of concrete engineering projects, the consumption of precast concrete products is also showing a growing trend. Compared with ordinary concrete, precast concrete requires concrete to have a better early strength development rate, so as to improve the formwork turnover rate, or meet the strength development under low temperature conditions, extend the production period of precast concrete to late autumn or even winter, and be durable to concrete Sex also has higher requirements. There are two technical ways to realize the coagulation-accelerating and early-strength function of polycarboxylate superplasticizer: one is to synthesize the polymer itself with good coagulation-accelerati...

AI Technical Summary

Problems solved by technology

[0003] CN101024565A discloses an early-strength composite water-reducer obtained by compounding early-strength components such as anhydrous calcium chloride, triethanolamine, and sodium benzoate, which can improve the compressive strength to a certain extent, but does not mention whether it has the effect of accelerating Coagulation effect, and contains chlorine salt, which has corrosion to reinforced concrete; Japanese patent JP6005050 discloses a composite early strength agent using sodium carbonate and aluminum sulfate, which can improve the early strength of concrete, but it is easy to cause poor performance in the later stage, and Increase the alkali content in concrete, which will accelerate the alkali-aggregate reaction

The above technical solutions all have problems such as not obvious effect of early strength, and part of the water reducing performance is sacrificed at the same time when early strength is produced, resulting in increased cost and other problems.

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