4 Ready mix concrete myths debunked
Our experts discuss some of the biggest misconceptions that come with laying and finishing ready mix concrete.
With any kind of concrete comes myths about how to use it. Laying and finishing concrete can be tricky, so it’s important to address any misconceptions that you may have about it. Read on for the myths we hear the most often when it comes to ready mix concrete.
Concrete is impermeable
Water, either in liquid or vapour form, can pass through concrete. You can make concrete less permeable by using well-graded aggregate, though even the densest concrete can be porous. However, Surface treatments can help to make your concrete flooring impermeable; our experts would be happy to advise further on the matter.
It’s fine to lay concrete in any weather
The ratio of water to cement in your concrete is a fine balancing act. When it rains, naturally this adds more water than is necessary to your concrete mix, making it weaker. It’s best to lay concrete in mild, dry weather if possible; too much heat can also crack the concrete and result in a curing process that is too rapid.
Concrete will remain flat and level once it’s finished
Concrete will change in volume whilst setting, hardening and drying. This is why it’s important to get a professional finisher in to do the job for you; slab edges can curl when there’s a difference in moisture content and the temperature of the slab. Curling is less common though when you minimise temperature differentials.
Reinforced concrete won’t crack
Using steel to structurally reinforce your concrete can actually transfer the tensile stress from the concrete to the steel, however, reinforcement doesn’t prevent concrete from cracking. Minor cracks are usually nothing to worry about and are purely an aesthetic concern; hairline cracks are very difficult to avoid altogether, even for the most experienced concrete finishers!