Mass pours are largely beneficial with saving the associated costs and time with the decreased number of necessary joints. Because excess thermal energy is produced in large mass pours, it can often lead to cracking of the concrete – and a low heat cementitous solution is required.
A mass pour of sufficient size will demand special attention to logistics and technicalities including:
In the core of sections greater than 2 metres thick, the temperature rise will nearly be adiabatic. The cement content per cubic metre fundamentally determines the heat generated, and values of peak temperatures of the order of 70–80°C are possible.
The heavily reinforced foundations required to carry significant design loads tend to create situations where the construction of joints or temporary stop-ends are impossible to form.
The drawback of cracks that might transpire where construction joints are not used, is relatively minor. However, the importance of these cracks should be considered in relation to the structural requirements of the section, together with considerations of durability.