Alkali-activated slag cement retarder and preparation method thereof

Abstract

The invention relates to the technical field of building materials, in particular to a retarder capable of prolonging alkali-activated slag cement setting time and increasing an interval between initial setting time and final setting time, and a preparation method of the retarder. The alkali-activated slag cement retarder is characterized by being prepared from the following raw materials by weight percent: 30-50% of boric acid, 15-35% of brown sugar and 15-55% of superfine slag powder. The alkali-activated slag cement retarder is simple to use; only based on the mass of alkali content of alkali-activated slag cement during preparation, the mixing amount of the retarder is 10-15% of alkali mass, and the proportion of the retarder is 2.0-3.0% of the mass of the alkali-activated slag cement, so that the cost is lower; the retarder has a good retarding effect; according to the different mixing amounts, the initial setting time can be adjusted to 2-15h, the interval between the initial setting time and the final setting time is increased, and the final setting time can be adjusted to 10-25h; the increment and development of early strength and later strength are not influenced; the alkali-activated slag cement retarder can be used for inhibiting the efflorescence phenomenon of the alkali-activated slag cement after construction; the retarder can absorb excessive alkali added into the alkali-activated slag cement by means of a neutralization reaction, and has an inhibiting effect on the efflorescence phenomenon of the building materials after construction.

Description

technical field [0001] The invention relates to the technical field of building materials, in particular to a retarder capable of prolonging the setting time of alkali slag cement and increasing the interval between initial setting time and final setting time and a preparation method thereof. Background technique [0002] Building materials are the most widely used class of materials. At present, the application process of traditional building materials follows the pattern of development-application-abandonment, which leads to the depletion of resources, and causes a large amount of waste materials, pollutant discharge and environmental degradation. For every ton of steel produced, tens of tons of steel slag, slag and other waste slag will be produced. The discharge of solid waste occupies land, pollutes the environment, endangers human health, and also causes a huge waste of resources. How to reduce the consumption of non-renewable resources, make full use of industrial w...

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Problems solved by technology

[0004] Although alkali slag cement has a series of excellent properties that ordinary Portland cement does not have, such as rapid hardening and early strength, high temperature resistance, corrosion resistance, low-carbon environmental protection, etc., it is still not widely used, mainly because there are technical problems in its construction and use. Difficulty: Fast setting problem

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