Fly Ash Concrete Polished Floor

Turnkey dry polished concrete flooring solutions for existing building and new construction.

Fly ash concrete polished floor.

Fly ash consists mostly of silica alumina and iron. Adding fly ash to a concrete mix can affect it in the following ways. Concrete made with fly ash requires less mix water and bleeds less than portland cement concrete. Concrete properties the specified compressive strength f c is equal to 4000 psi.

Minimize fly ash or slag cement replacement in an exposed aggregate finish. Polished concrete floor application 1. In the winter many contractors prefer to have no fly ash in the concrete because the cold weather already retards set and fly ash retards it. This is strong enough to polish in a month but not so strong as to slow polishing progress and increase polishing costs.

Dosage rates vary depending on the type of fly ash and its reactivity level. Air content greater than three percent increases the risk of blisters and delamination in. Fly ash makes the concrete more workable. Fly ash in concrete contributes to a stronger more durable and more chemical resistant concrete mix.

Its tiny sphere shaped particles fill small voids and produce a denser concrete. This can be beneficial for cream polishing as harder floors will be more reflective and have more depth in their finish than softer floors. It also makes the concrete less permeable. In the summer fly ash can be beneficial to a contractor s efforts to produce a flat floor because many fly ashes retard set increasing the time finishers have to meet a tight flatness specification.

Do not allow air content of trowel finished floors to exceed three percent. This means that outside moisture will not penetrate it as easily. Typically class f fly ash is used at dosages of 15 to 25 by mass of cementitious material and class c fly ash at 15 to 40. If floor conditions appear to be detrimental to progress and satisfactory completion of the floor the general contractor and architect should be contacted before work.

The main benefit of fly ash for concrete is that it not only reduces the amount of non durable calcium hydroxide lime but in the process converts it into calcium silicate hydrate csh which is the strongest and most durable portion of the. So using fly ash concrete offers the benefit of a stronger more durable product while reducing the environmental impact of concrete manufacturing and providing a beneficial re use for fly ash. Avoid fly ash slag in the mix. Further as the fly ash is a very small particle it will.

Increasing the fly ash content of a slab will both darken and harden the finished floor.