Slag-coal ash compound solid exciter and preparation method thereof

Abstract

The invention relates to a slag-coal ash compound solid exciter and a preparation method thereof, and belongs to the field of cement and concrete building materials. The preparation method for the slag-coal ash compound solid exciter comprises the steps as follows: carrying out compound modification on sodium hydroxide, sodium carbonate and low-modulus liquid water glass as well as a modifying agent-polyacrylamide or polyphosphate, ageing and digesting in vacuum condition, drying and grinding. The slag-coal ash compound solid exciter overcomes the defects of poor stability of the traditional solid base exciter and difficult field construction of the traditional liquid exciter, has the advantages of good stability, unsuitability for moisture absorption or air slaking and a wide range of material sources, and can be directly mixed and ground with the slag and the coal ash to prepare high-strength hydraulic cementing materials. The cement can be fully replaced with the cementing material obtained by the excitation of the exciter in the concrete, so that the concrete strength can be enhanced by about 20-30%, and the concrete durability can be improved.

Description

technical field [0001] The invention relates to a slag-fly ash composite solid activator and a production method thereof, belonging to the field of cement and concrete building materials. Background technique [0002] Fly ash and slag powder are currently the most widely used active mineral admixtures in the engineering field. Fly ash and slag powder are added to the coagulation at the same time. The "complementary effect of working performance and strength advantages" of the two makes the concrete have good Workability, impermeability and pumpability. However, when a large amount of auxiliary cementitious materials such as fly ash and mineral powder are added to the concrete, especially in the case of a large amount (> 50%), the compressive strength on the concrete, especially the early compressive strength, tends to In this case, how to stimulate the hydration activity of auxiliary cementitious materials in concrete and improve the early strength of concrete has become...

AI Technical Summary

Problems solved by technology

Existing patents or documents show that the most effective alkali activator is the solution system of NaOH and liquid sodium silicate, but the liquid activator has disadvantages such as instability and inconvenient use, and cannot directly produce alkali-activated gelling Material

The solid activators are mostly NaOH and KOH. NaOH and KOH are very easy to absorb water and deliquescence in the air. When they are ground together with the gelling material, a local alkali-gelling material hydration reaction will occur, resulting in alkali glue. Coagulation materials fail quickly

If solid alkali metal silicates are used, due to their low solubility in water and slow dissolution rate, it is difficult to excite mineral admixtures alone, even with better solubility instant powdered sodium silicate. , it is also difficult to achieve the effect

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