No. The fly ash desulfurization process causes a large amount of ammonia salts to exist in the fly ash, which releases pungent ammonia gas when encountering alkaline environments such as cement. The enrichment of phosphate or sodium sulfite in some fly ash will cause problems such as long setting time and reduced strength of concrete.
1. There is a pungent ammonia smell after pouring, which affects personal safety;
The setting time of cement concrete is prolonged, and the working performance of the concrete is greatly reduced.
2. After pouring, due to the presence of ammonia, more unevenly dispersed bubbles will appear.
3. After the concrete hardens, there will be yellow spots or bubble marks on the surface.
4. If the ammonia content is too high, it will accumulate inside the concrete, which will lead to problems such as an increase in the air content of the concrete, expansion of the volume of the concrete, and a decrease in strength.
5. The ammonia that overflows during the condensation and hardening process of concrete will be concentrated on the surface of the steel bars, causing the holding force between the concrete and the steel bars to decrease, thereby causing the concrete to lose its protective effect on the steel bars. In view of this, it is indeed necessary to provide a method for removing the residual ammonium component in fly ash to reduce the ammonium content in fly ash, ensure the quality stability of fly ash, and improve the quality of concrete projects.