The present invention relates to a method for controlling an alkali aggregate reaction that reduces the strength of a mortar or concrete when a large amount of an alkaline component is contained in order to use a ferronickel slag, The purpose of this study is to provide a method to reduce alkaline aggregate reaction by mechanochemical pulverization and activation by treating mechanized chemical processing of blast furnace slag powder and coal coal ash by-product. In particular, it is possible to replace the aggregate used in the production of cement and mortar containing a large amount of alkaline components by using the fine powder component, which is a byproduct of other industries, and the stable strength of the product can be secured.;Ferronickel slag, mechanochemistry, alkali aggregate reaction, blast furnace slag, coal ash,
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