Below are examples of four different types of finishes: chemical retarder, polished, acid etched and sandblasted.
Click on the image below to view our variety of finishes:
Bush Hammering and Needle Gunning
Either a bush hammer or needle gun is worked on the finish of the concrete removing the laitance to expose the aggregate. The processes “bruise” the aggregate with the main aesthetic difference between them being that needle gunning will provide a relatively sharper arris than can be achieved by bush hammering.
The occurrence of hand arm vibration in these processes effectively means that these finishes should only be considered for small areas. Sand blasting can provide a similar and more cost effective appearance.
Patterns can be created in the face of the concrete by using rubber formliners. These offer a vast range of shapes and patterns. Alternatively, if required to mirror an existing profile, this can be done by pouring fresh compound over the profile and leaving it to set. Thus a “negative” will be created onto which the concrete can be poured.
Brick Faced Cladding
Brick faced cladding panels offer a ready solution with speed and accuracy for both traditional and modern structures alike. Brick faced panels are manufactured in a factory environment independent of weather conditions and can be delivered to site ‘just in time’ thereby reducing site storage requirements.
By choosing the precast option, the brickwork cladding can be removed from the critical path, a dry building envelope can be established earlier allowing follow on trades to commence sooner, removing wet trades from site as well as addressing the skill shortage on site. Furthermore, variations in workmanship skills are eliminated by utilising precast panels.
Precast brick faced cladding panels are made face down in moulds using a liner to ensure correct brick placement and consistent joint size. Joints between bricks are sealed to ensure that grout does not steep onto the surface. Bricks are also pre-soaked to ensure that they do not take moisture from the fresh concrete. The back face of the brick is removed so that the bricks can form a mechanical key with the concrete. Care should be taken in the choice of bricks to be used in brick faced panels, in particular uniformity of colour, thereby reducing the risks of variations between panels. Panels are either post pointed using a proprietary product or pointed on site to match insitu brickwork.
Only bricks with a water absorption rate of 12% or less should be considered. Brick faced panels can be pointed on site to match in with insitu brickwork if required or can be pointed at the factory prior to delivery to site and thus avoiding scaffold and follow-on trades.
Pre-soaked bricks placed in the mould using a liner for correct positioning.
Ceramic tiles can also be used as a facing material. They are placed in the mould and cast into the backing concrete. Bonding is achieved by providing a roughened or profiled back to the tiles.
Stone Faced Cladding
Natural stone finishes are achieved by placing thin natural stone veneers into the mould.
The stone slabs are placed and cast into the concrete backing component. The stone is always anchored to ensure permanent attachment and a de-bonding membrane is introduced between the stone and the backing concrete.