Ready Mix concrete is proportioned in a concrete batch plant according to any number of set recipes. The concrete is then mixed and delivered to the desired location via truck mounted mixers. Using a good quality batch process and good quality equipment can result in a precise mixture.
A typical mix will comprise of about 60 to 75 percent aggregates (mix of sand and stone), 10 to 25 percent is cement and 10 to 20 percent is water.
Each batch of concrete can be made to order in both size and type. In Canada the typical size of a full load batch is between 7 and 9 cuM. Some trucks are capable of carrying up to 11 cuM. However many roadways have weight restrictions that limit the over all mass that can be carried per axle of the vehicle, especially during spring and fall when the ground is soft.
When choosing a concrete mix design the formula will depend on the needs of the project in terms of the required strength, the weather conditions it will be exposed to, the final appearance, the cost of various additives, building codes and local legislation.