Coal ash activity exciting agent and preparing method of coal ash activity exciting agent

Abstract

The invention provides a coal ash activity exciting agent and a preparing method of the coal ash activity exciting agent. The preparing method includes the step that sodium sulfanilate, water, alkali liquor, acetone, urea and a formaldehyde solution are mixed to react to obtain the coal ash activity exciting agent, wherein the coal ash activity exciting agent has repeated units shown in the first formula (please see the specifications for the formula), and the number-average molecular weight ranges from 5000 to 20000. The coal ash activity exciting agent structurally comprises N bonds with lone pair electrons and C=O double bonds with lone pair electrons, active SiO2 and active Al2O3 in coal ash can be excited to react with calcium ions obtained by ionizing Ca(OH)2, and hydration products, such as hydration calcium silicate and hydration calcium aluminate, of space network structures are generated; in addition, a large amount of hydroxy is contained in molecules of the coal ash activity exciting agent, after the coal ash activity exciting agent is dissolved into water, OH- is obtained through ionizing, the surfaces of vitreous bodies of the coal ash can be corroded, the surface structure of the coal ash is broken up, unsaturated bonds of the coal ash are increased, the pozzolanic reaction is prompted, and the activity of the coal ash can be effectively excited under the condition that the doped amount is small.

Description

technical field [0001] The invention relates to the technical field of building materials, in particular to a fly ash active activator and a preparation method thereof. Background technique [0002] Fly ash is a fine ash that can be collected from the flue gas after coal combustion. It is a potentially active pozzolanic powder that can be used as an admixture for building materials such as cement and concrete. It can improve material properties and reduce cost etc. The composition of fly ash includes active components and smooth and hard vitreous body, etc., among which, the existence of glass body will hinder the hydration of active components, resulting in low activity of fly ash in the early stage of use, affecting its performance in cement and concrete. dosage. [0003] In order to increase the content of fly ash in cement and concrete, its potential activity must be stimulated. There are three main ways to stimulate the activity of fly ash: one is physical activation...

AI Technical Summary

Problems solved by technology

[0004] Although the above-mentioned activators have a certain stimulating effect on the activity of fly ash, the dosage of these fly ash active activators is generally large, the cost is high, and it will also affect the quality of materials such as concrete, for example, the alkali content Too high will cause alkali-aggregate reaction, chlorine salt will corrode steel bars, etc.

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