On the Use Characteristics of Fly Ash in Concrete

Because the particle size of fly ash ultrafine powder is small (the minimum particle size is only less than 1.0 μm), it can fill the gaps between cement particles very well and replace the free water in the gaps of cement particles, thus increasing the free water content in the mixture, reducing the viscosity and improving the workability.
However, when the ultrafine powder particles fill the gaps between the cement particles, the excess ultrafine powder will adsorb free water in the mixture, causing the viscosity of the mixture to increase.
At this time, according to the characteristics of each material, the gelding material and sand rate of repeated adjustment, such as in the strength of the surplus coefficient is still fully satisfied when the cement amount can be appropriately reduced, that is, to reduce the amount of gelding material. In the actual use process, according to the material characteristics used by each company, we will continue to explore and adjust, so that we can find the best combination point between the construction pumping state, production cost and commercial concrete strength of each company!