frequent asked questions
There are three key ingredients in every type of concrete: water, cement and aggregate. The proportion or ratio of these ingredients will determine the type of concrete produced.
The aggregates used will also differ depending on the application of the concrete, for example, a smooth concrete screed will use a finer aggregate such as sand, while a more structural concrete might use stones and large gravel. Additional materials can also be added to give the concrete different qualities, for example fibers to enhance strength, plasticizers for better workability or retarding agents to reduce the rate of setting.
Some types of concrete are better for the environment that others. For example, pervious or permeable concrete is more porous and so allows water to penetrate through. This reduces the risk of flooding from heavy rain and lets the water infiltrate the ground beneath for trees and plants to access. Also, some of the aggregates in concrete can come from recycled sources, such as rubble from demolitions, reducing the use of raw materials.