Concrete Driveways | Shand Concreting

By: Shand Contracting  06-Dec-2011
Keywords: Excavation, Acid, Sealer

Excavation

Excavation is very important; it is vital to get the base solid enough to support your concrete to prevent subsidence later on. We can carry out all work required to achieve a good solid base.

Vehicle Crossings

We are on the preferred HCC Contractors list including construction of vehicle crossings. We will organise everything except the consent to complete your crossing to HCC specifications.

Plain Concrete

Although plain concrete is your least expensive option, we can still achieve a good look with the right finish. Sealers are not required for a plain concrete finish.

Coloured Concrete

Acid Wash

We recommend Acid Washing and sealing of coloured concrete, here are some reasons:

  1. It brings out the true colour
  2. It protects the surface
  3. Easy to clean
  4. Non-slip ingredient ensures grip

Imprinted or Stamped Concrete

Imprinted concrete can give an authentic slate or stone look with patterns or just a big slab appearance. Imprinting takes place before the concrete is hard. A secondary colour, colourwash is applied after a few days to give the ‘aged’ or authentic look. We have a selection of patterns available or can hire one of your preference. Brochures are available. Imprinted concrete should be sealed.

Exposed Aggregate

Exposed Aggregate is supplied by the concrete companies and although there are many different names for the stones, often they come from the same quarry. Samples can be viewed at ‘Trade Tools’ on Karewa Place or Allied Concrete in Perclo Place.

Exposed aggregate is extremely hardwearing and doesn’t show up tyre marks. Colour can be added to the mix to enhance the look further.

Sealer is optional, but is recommended.

Decorative Saw Cuts

Decorative saw cuts are usually 10mm wide and to incorporate the expansion saw cuts (approx 3m apart) are usually 1.5 or 1m squares. Saw cutting is normally done two weeks after pouring to achieve sharp edges without chipping.
Grouting is done using a non-shrinking ‘Sika’ grout which can have colour added to match the concrete.

Expansion Cuts

Concrete cutting is essential and should be done at 30 times the the depth of the concrete (or every 3m). The reason for this is that concrete shrinks as it cures, therefore it should crack where the cuts are placed, minimising the chances of random cracking.

Concrete cutting should take place as soon as practical, but can’t be done too soon otherwise it will chip the edges. Normally within 48 hours, depending on weather conditions.

All coloured concrete or exposed aggregate should be sealed. The sealer stops the concrete from giving a fading effect and makes cleaning much easier.

Concrete should be acid washed and cleaned prior to sealing so the sealer bonds to the concrete. All moisture must be gone also. Two coats of sealer are applied, usually both on the same day and should include a non-slip ingredient otherwise the sealer can be slippery when wet.

Colour Booster Sealer

Colour Booster Sealer is a sealer with a colour additive, ideal for freshening up old, tired looking concrete, or previously coloured concrete which has gone patchy. A variety of colours are available.

Keywords: Acid, Excavation, Sealer, Vehicle Crossings