Thermal stress in concrete results from the development of mechanical properties in combination with thermal-related and autogenous deformation. There is a risk of cracks if stress exceeds current tensile strength.
B|A|S modulates the increase in compressive strength, Young modulus and tensile strength (on an hour-by-hour basis during the early stage) and compares the results with the volume change derived from autogenous shrinkage and thermal deformation over time.
The model uses the physical parameters of the concrete (thermal capacity and thermal conductivity), adiabatic temperature development and other boundary conditions (ambient temperature, wind velocity, solar radiation, formwork and insulation parameters, casting sequence and construction joints).
The model is applied to modulate the stresses within one pour, but also to modulate restrained deformation deriving from adjacent pours/elements and restrained deformation from rock bed foundations.
B|A|S consultancy expertise provides measures and recommendations for avoiding or reducing cracks or crack width.