What is the main role of fly ash added in concrete products?
Fly ash can inhibit the bleeding of fresh concreteFly ash can fine crumbs compensation in fine aggregate shortage, interrupt continuous bleeding mortar channels, and fly ash as cement replacement materials in the same consistency will make use of concrete water quantity is reduced in different degree, thus adding fly ash is beneficial to prevent the fresh concrete the bleeding.
The later strength of concrete can be improved by adding fly ashThe experimental data show that when the concrete is mixed with fly ash, the early strength (28 days ago) decreases with the increase of fly ash content, while the latter strength increases gradually. Fly ash has three effects on the strength of concrete: reducing water consumption, increasing cement content and increasing strength through long-term volcanic ash reactions.
The workability of fresh concrete can be improved by adding fly ashThe workability of fresh concrete is affected by the volume, water cement ratio, gradation, shape and porosity of the aggregate. The fly ash is used for fresh concrete is the obvious benefits of increasing the slurry volume, slurry filled with aggregate between pores, inclusions and lubrication of aggregate particles, so that the concrete mixture has better cohesiveness and plasticity. The aggregate particles of fly ash can reduce the interfacial friction between the paste and aggregate, and improve the workability of the concrete mixture at the contact point of the aggregate.
The rational use of fly ash in concrete, not only can replace part of cement, reduce the construction cost, but also because of its unique properties can be effectively used for the various requirements of the use of concrete, improve and enhance the performance of concrete.
