In order to prevent cement hydration in cement-based materials from producing carbon dioxide and other aggravating greenhouse effects, and reduce the pollution of rice husk to the environment, rice husk was calcined into rice husk ash at 800 ℃ high temperature. The influence of high-temperature rice husk ash on cement hydration was studied through hydration test by mixing rice husk ash into cement mortar. The influence of high temperature rice husk ash on cement hydration was further verified through mechanical strength test and microstructure...