Fly Ash Concrete Polished Floor

Adding fly ash to a concrete mix can affect it in the following ways.

Fly ash concrete polished floor.

Currently more than 50 of the concrete placed in the u s. Minimize fly ash or slag cement replacement in an exposed aggregate finish. 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. This can be beneficial for cream polishing as harder floors will be more reflective and have more depth in their finish than softer floors.

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. It also makes the concrete less permeable. Turnkey dry polished concrete flooring solutions for existing building and new construction. Do not allow air content of trowel finished floors to exceed three percent.

A standard concrete mix contains about 5 fly ash. 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. Increasing the fly ash content of a slab will both darken and harden the finished floor. Polished concrete floor application 1.

Concrete properties the specified compressive strength f c is equal to 4000 psi. Fly ash consists mostly of silica alumina and iron. Dosage rates vary depending on the type of fly ash and its reactivity level. Avoid fly ash slag in the mix.

Concrete made with fly ash requires less mix water and bleeds less than portland cement concrete. Fly ash in concrete contributes to a stronger more durable and more chemical resistant concrete mix. 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. Contractor should first check work area and conditions and evaluate floor for flatness and levelness.

Further as the fly ash is a very small particle it will. Its tiny sphere shaped particles fill small voids and produce a denser concrete. Fly ash makes the concrete more workable. 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.

This means that outside moisture will not penetrate it as easily.