Technique and method for preparing mineral additive of multi-function concrete

Abstract

A multifunctional mineral additive for concrete is prepared through superfine grinding of metal powder, purifying, diluting with quartz powder to obtain component A, proportionally mixing the industrial waste whose main component is ferrous sulfate with sodium sulfate, grinding to obtain component B, and proportionally mixing said A and B with dried calcium saccharide, fine powdered coal ash and anhydrite. It can control the slump loss of concrete and improve the antifreezing and impervious performance of concrete.

Description

1. Technical field: [0001] The invention belongs to building materials and provides a preparation technology and method of a multifunctional concrete mineral additive. 2. Background technology: [0002] As we all know, the problem of concrete cracking is a common problem in the engineering field, and the cracking of concrete greatly affects the function and service life of concrete. The development of concrete micro-expansion agent to solve concrete cracking has become a technical means commonly used in the engineering field. There have been a lot of research at home and abroad, and there are a lot of literature: [0003] The main technical contents in these documents are: [0004] 1. Using the principle of chemical reaction between gypsum phase substance and aluminum phase substance in the cement hydration system to generate ettringite and volume expansion, to prevent cracks caused by shrinkage of concrete. [0005] 2. The gypsum phase material is widely used from mined g...

AI Technical Summary

Problems solved by technology

These technologies can quickly generate ettringite in the cement hydration system, and the expansion is obvious, but the early expansion is generally large, and the delayed expansion is not obvious.

Moreover, due to the large amount of alunite, aluminate, sulfoaluminate and other substances used as the source of aluminum phase, on the one hand, a large amount of alkali is introduced into the concrete, which greatly increases the possibility of alkali-aggregate reaction in concrete containing active aggregates. On the other hand, in the fresh concrete hydration system mixed with high-efficiency superplasticizers, the hydration phase of aluminum salts follows the progress of cement hydration, and a large number of molecules of high-efficiency superplasticizers are adsorbed, resulting in a decrease in the actual performance of high-efficiency superplasticizers. The slump loss of freshly mixed concrete is obvious

In addition, the concrete expansion agent prepared by these technologies has a single function, usually only has a micro-expansion function, and cannot meet the requirements of modern concrete construction technology for the diversification of concrete admixture functions.

Moreover, the production cost needs to be further reduced

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