Method for measuring reaction degree of each substance in fly ash, silica fume and cement three-phase composite system

The invention discloses a method for measuring the reaction degree of each substance in a three-phase composite system of fly ash, silica fume and cement, which takes fly ash, a cement system and the fly ash, the silica fume and the cement system of a certain age as raw materials, firstly, free water in the raw materials is replaced by alcohol solution, and the raw materials are ground and dried; the percentage content of the chemically bound water of the two is obtained through thermogravimetric analysis, the hydration degree of the cement of the two is obtained through X-ray diffraction analysis, and the mass of insoluble substances of the two is obtained through selective dissolution; the reaction degree of the fly ash and the cement system and the reaction degree of each substance in the fly ash, the silica fume and the cement system are obtained through calculation; the formula test result of the invention is accurate and reliable, can effectively distinguish the reaction degree of silicon ash and fly ash which are difficult to distinguish in a three-phase composite system, and provides a powerful basis for the design of high-performance and ultrahigh-performance concrete structures.