Fly Ash Concrete Polished Floor

It also makes the concrete less permeable.

Fly ash concrete polished floor.

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. Further as the fly ash is a very small particle it will. Adding fly ash to a concrete mix can affect it in the following ways. This means that outside moisture will not penetrate it as easily.

Its tiny sphere shaped particles fill small voids and produce a denser concrete. Air content greater than three percent increases the risk of blisters and delamination in. Increasing the fly ash content of a slab will both darken and harden the finished floor. Currently more than 50 of the concrete placed in the u s.

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. Polished concrete floor application 1. This can be beneficial for cream polishing as harder floors will be more reflective and have more depth in their finish than softer floors. 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.

A standard concrete mix contains about 5 fly ash. Minimize fly ash or slag cement replacement in an exposed aggregate finish. This is strong enough to polish in a month but not so strong as to slow polishing progress and increase polishing costs. 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.

Concrete made with fly ash requires less mix water and bleeds less than portland cement concrete. Fly ash makes the concrete more workable. Fly ash consists mostly of silica alumina and iron. Concrete properties the specified compressive strength f c is equal to 4000 psi.

Avoid fly ash slag in the mix. Dosage rates vary depending on the type of fly ash and its reactivity level. 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. Fly ash in concrete contributes to a stronger more durable and more chemical resistant concrete mix.

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.