The amount of fly ash in the cementitious material varies depending on the type of cementitious material and the occasion of use. Generally speaking, fly ash can be used as an auxiliary cementitious material, and its content is usually between 20% and 40%.
Adding fly ash to cement can significantly improve the performance of cement, improve the impermeability and durability of cement, and reduce the production cost of cement. As an auxiliary cementitious material, fly ash is usually mixed between 20% and 30%. Adding fly ash to concrete can improve the working performance of concrete, reduce shrinkage and creep, improve corrosion resistance, etc., and at the same time can save cement consumption and reduce costs. The content of fly ash in concrete is generally 20% 40%.
Fly ash can also play an important role in gypsum-based cementitious materials. Gypsum-based cementitious materials with excellent properties can be prepared by mixing fly ash with semi-aqueous gypsum or building gypsum in a certain proportion, and after grinding and other treatments. The content of fly ash in gypsum-based cementitious materials is generally 10% to 30%.
In addition, fly ash can also be used as one of the raw materials for the resource utilization of waste residue to prepare composite cementitious materials with excellent performance. For example, fly ash is mixed with lime, slag and other raw materials in a certain proportion, and after grinding and other treatments, composite cement with excellent properties can be prepared. The strength grade, compressive strength and other performance indicators of this composite cement meet the requirements of national standards, and at the same time have excellent impermeability, durability and corrosion resistance.
In short, the amount of fly ash in the cementitious material varies depending on the type of cementitious material and the occasion of use. In practical application, the appropriate fly ash content should be selected according to different needs and actual conditions to achieve the best use effect and economic benefits.