A concrete slump retaining agent

Abstract

The invention discloses a concrete slump-retaining agent, which is prepared from the following materials in parts by weight: 10 to 15 parts of polyglutamic acid / chitosan oligosaccharide hydrogel, 5 to10 parts of maleic anhydride, 4 to 8 parts of polyethylene oxide, 6 to 8 parts of ethylene diamine tetra(methylene phosphonic acid)sodium, 3 to 8 parts of hydroxyethylamine, 3 to 5 parts of diethanolisopropanolamine, 6 to 10 parts of ethylenediamine and 40 to 50 parts of water. The concrete slump-retaining agent disclosed by the invention can overcome the defect of excessive and overquick slump loss existing in highly effective water reducing agent, and the slump-retaining effect is remarkable; when dosage is 0.05 percent of cement weight, no slump loss takes place within 60 minutes, and within 90 minutes, the maximum slump loss is only 10.5 percent; the concrete slump-retaining agent can keep the flowability of newly mixed concrete, and creates a favorable condition for the use of commercial concrete.

Description

technical field [0001] The invention belongs to the technical field of concrete admixtures, in particular to a concrete slump retaining agent. Background technique [0002] With the vigorous development of commercial concrete industry for construction, concrete admixtures in my country have been widely used in recent years, among them, Cai series sulfonate formaldehyde condensate type high-efficiency water reducer, melamine sulfonate formaldehyde condensate type high-efficiency water reducer Water agent, lignosulfonate water reducer, sugar calcium water reducer, etc. are used in large amounts. These superplasticizers endow fresh concrete with good fluidity and strength, which can basically meet the construction needs for on-site mixing. However, for ready-made concrete, there is generally a problem of excessive slump loss. [0003] At present, there are many methods to solve the slump loss of concrete, and the common ones in construction are as follows: (1) Add retarder to ...

AI Technical Summary

Problems solved by technology

However, although the use of method one solves the loss of concrete slump, it will affect the setting time of cement, which will affect the construction progress to a certain extent, which is unfavorable in engineering construction

Using method 2 and method 3 can solve the loss of concrete slump. Although it does not have much influence on the setting time of cement, it is difficult to control the amount of water reducing agent, which will inevitably cause over-mixing of water reducing agent, thus affecting the project. quality

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