Reduce Cracks in Mass concrete-modelling restraint in mass concrete-cement type and time of removal of formwork

摘要

During hardening of concrete temperature depending strains occur. In the same period the material properties young's modulus, compressive strength and tensile strength etc. develop. Because of the reason that resistances and stresses are developing dependent the ongoing hydration a time history calculation is one way to calculate the ability to crack in every single time step. In a research project about decreasing the cost of reinforced concrete protection measures against natural hazards in water engineering the influence of different cement types on the possibility to get cracks because of restraint is worked out. This paper gives a detailed description of the used ABAQUS Finite-Element-Model. Two aspects of the results of the calculations are pointed out: The influence of different cement types on the crack ability and the consequences of different age of the concrete when the formwork is removed.