The Australian Open has concluded over the weekend, with Novak Djokovic achieving an amazing three straight sets win against world number three player Daniil Medvedev. A more formidable challenger may have been Stefanos Tsitsipas!
As we watch the game and appreciate the facilities, do we ever consider the engineering involved in providing such a facility – the grandstands, the seating, the level playing surface. Do we wonder why there are no cracks in these tennis courts but every other piece of concrete always has crack?
This article will outline the importance of pavement slabs and the need for the allowance of thermal expansion of surfaces.
Tennis courts are constructed in various ways. When designed and constructed properly, concrete slabs can remain crack free and durable for many years. During the curing process, concrete mixes lose large amounts of water. This loss of water will shrink the concrete slab and if not properly addressed with reinforcement, curing, joints or post-tensioned cables, will result in cracks forming throughout the slab.
Slabs are strengthened in each direction with reinforcing steel bars for which the amount of reinforcement will hold shrinkage cracks tightly closed and eliminate any differential vertical movements at the cracks such as bounces of the ball or footwork of the players. The tennis court will then retain a smooth, playable surface and sustain a crack free environment for many years.
Joints created within the slabs – dowel joints, expansion joints, sawn joints each paly their part in the success of a stress free and crack free court surface.
Good design will ensure that the only stress on the court is with the players and not the court surface.
Hot n' Cold Tiles
After experiencing scorching hot weather, especially over the Australia Day Long Weekend, summer is at its peak. Residents need to keep watch over lifting tiles on their property, a common issue which BellMont encounters, especially during hot climates. Lifting tiles, also known as tile delamination, is caused by the tiles not being bonded properly, lack of movement joints and thermal effects. Moisture (weather change or even a leaking or plumbing problem) can absorb through the concrete. The more water is absorbed, the higher risk of the tiles to expand and crack.
During summer, the tiles, if not properly installed at first, will start the “expanding state” caused by the moving of the surface below the tiles. The tiles will push against one another, causing strain and pressure, resulting the concrete to crack and the tiles to tent. When the climate is cool, buildings tend to contract and if cold is met with warm substance such as heaters, this creates a lot of pressure, causing the tiles to lift. Suitable adhesives and correctly spaced expansion joints are necessary in order to allow thermal movements to be accommodated.
Have your tiles been lifted? Are you experiencing raised surfaces? Get in touch with us today for an inspection on your property.