Paste type retarder as well as preparation method and application thereof

Abstract

The invention relates to the technical field of building materials, and particularly discloses a paste type retarder as well as a preparation method and application thereof. The retarder is prepared from the following components in parts by weight: 113 to 200 parts of sodium gluconate, 25 to 47 parts of citric acid, 8 to 15 parts of a thickening agent and 688 to 813 parts of water. The preparation method comprises the following steps: S1, preparing raw materials; s2, adding sodium gluconate and ferric oxide into water to obtain a mixed solution; and mixing citric acid and a thickening agent to obtain a mixture; s3, slowly adding the mixture into the mixed solution, and stirring while adding; and S4, standing until the solution is pasty. The retarder can be used for local retarding of prefabricated parts, and has the advantages of long-term stability and effectiveness.

Description

technical field [0001] The application relates to the technical field of building materials, more specifically, it relates to a paste-type retarder and its preparation method and application. Background technique [0002] In the field of construction, when preparing large-area slabs, it is often necessary to combine prefabricated components and cast-in-place concrete to form new large-area slabs. This type of prefabricated component generally uses cement mortar to form the main body of the plate, and a plurality of steel bars are pierced in the length direction of the plate, so that the prefabricated component can be better connected with the cast-in-place concrete. When preparing this type of prefabricated component, it is necessary to make an exposed aggregate concrete surface on the joint surface of the prefabricated component and the cast-in-place concrete, so that the coarse aggregate at the joint surface is exposed 4-6mm, so that the new and old concrete can be reliabl...

AI Technical Summary

Problems solved by technology

The retarder obtained according to the above formula will have an unstable emulsion system one month after preparation, and the retarder will become thinner or precipitate, or be polluted by miscellaneous bacteria; especially in summer, when the external environment When the temperature is too high, the retarder is more likely to deteriorate, so it is necessary to add a large amount of preservatives to obtain a longer shelf life, but there are still cases where the retarder tends to become thinner or precipitate

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