The Problems

Why does this happen?


Issues that “paved the way” for the Slipform Process
Each year councils, local government authorities, state road authorities and private developers throughout Australia, from Qld down to NSW, west to Roma and anywhere in between, are faced with enormous costs for the reconstruction of badly constructed concrete kerbing which, in some instances, is in need of repair or replacement even before the paint has dried on the final house in the new subdivision!

What about the cracks in the newly laid concrete Kerbs, Kerb and Channel ? This is the first sign of weakness in the product and the start of the break down of this infrastructure  which is supposed to have lasted at least 50 years? Shaun Kelly knows why, explaining that, “In Australia, around 90% of kerb and channel is poured with dry mix extrusion machines. Unfortunately, unless the correct processes and procedures are followed, operator error can result in a number of problems, probably the most frequent being poor concrete quality resulting from insufficient water in concrete mix to provide the required hydration for the correct mixing of the cement and the aggregates.”

Another major issue is a lack of equipment maintenance – particularly in relation to the compaction mechanism of a kerb machine. “These factors add up to inadequately compacted kerb, which over a period of time will start to crack and break up – leaving council to foot the bill in repairs.”

Interestingly, you might ask why these issues go unnoticed at the time of construction. The answer is simple – create an illusion. Even if all of the problems listed above where happening at the same time, you would still get a product to come out the back of the kerb machine, just as cosmetic foundations can cover skin imperfections, the dry extrusion process of kerbing uses slurry to cover over the concrete and then Kerb finishers trowel and joint-up and there you have it – a nice straight, shiny and nicely finished kerb that looks good and is pleasing to the eye, but is structurally floored. The underlying blemishes are bound to resurface.

For all enquiries, call Shaun Kelly on 0418 736 792 or email at