Curing mode-sealed curing specially suitable for alkali-activated material

Abstract

The invention discloses a curing mode-sealed curing specially suitable for an alkali-activated material, and belongs to a curing method specially applied to the alkali-activated material. The specificmethod comprises the following steps: after an alkali-activated test piece is prepared, immediately sealing a casting surface by using a plastic thin film, and covering a sealing surface with wet dishcloth, and ensuring the wet dishcloth to keep in a wet state; after a mould of the alkali-activated test piece is detached, completely wrapping and sealing the alkali-activated test piece by using the plastic thin film immediately, simultaneously covering the alkali-activated test piece by adopting the wet dishcloth, and ensuring the wet dishcloth to keep in the wet state, wherein the temperatureof the curing environment is 10 to 40 DEG C, and the humidity is 50 to 100 percent. The sealed curing can effectively relieving the dissolution of OH<->, free alkali and active substances in the alkali-activated test piece, promote a polymerization and the formation of a polymerization product, remarkably improve the compressive strength of the test piece, effectively prevent the formation of a shrinkage crack and a temperature crack and obviously alleviate the saltpetering phenomenon of the alkali-activated test piece, and has great significance to the application of the alkali-activated material.

Description

technical field [0001] The invention relates to a curing method specially suitable for alkali-excited materials-sealed curing. Background technique [0002] Alkali-activated material is an inorganic non-metallic material developed in recent years. This type of material is mostly made of natural aluminosilicate minerals or industrial solid waste as the main raw material, mixed with other mineral admixtures and an appropriate amount of alkali-silicate activator After being fully mixed, it is formed under normal temperature or autoclaved conditions, and the strength is gradually built up during the curing process. It is a type of gelling material bonded by aluminosilicate gelling components. Studies have shown that the preparation of high-strength alkali-excited specimens is not only closely related to the mix ratio of raw materials, but also the curing method is crucial to the development of the strength of alkali-excited specimens. Appropriate curing methods can promote the ...

AI Technical Summary

Problems solved by technology

However, the polymerization reaction of alkali-excited materials must be carried out in a high alkalinity environment (generally pH greater than 14.0), and the polymerization reaction cannot generate Ca(OH) 2 Alkaline substances to alleviate the drop in pH

If the alkali-excited material is cured by sprinkling water, it will inevitably lead to a large amount of free water gathering on the surface of the test piece, which will cause an excessively high alkalinity difference between the inside and outside of the test piece and the free alkali (Na + with K + ) concentration difference, resulting in OH inside the specimen - , free alkali, and a large amount of active substances (active calcium, silicon, etc.), lead to a decrease in the alkalinity of the test piece, which seriously hinders the progress of the polymerization reaction and the formation of polymerization products, resulting in a sudden drop in the strength of the test piece

Therefore, the curing method of cement concrete is not suitable for alkali-excited materials, and cannot provide a good polymerization reaction environment for the development of the strength of alkali-excited specimens

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