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High alkali content in fly ash can contribute to ASR, a deleterious reaction between alkalis in the concrete and reactive silica in aggregates. This reaction forms an expansive gel that can cause cracking and deterioration of concrete. The alkali content of fly ash is a critical parameter influencing its suitability for use in concrete. Managing and optimizing the alkali content can enhance concrete durability, prevent deleterious reactions, and improve the overall performance of concrete mixes. By carefully selecting and blending materials, and through rigorous testing and monitoring, the benefits of using fly ash in concrete can be maximized.