ABSTRACT
After a perfect design, things can go wrong during casting of a concrete structure. The concrete constituents can be badly proportioned or the mixing procedure can be inappropriate. By ignorance or by accident, aggressive substances could even be mixed into the concrete. On the level of the formworks, problems can occur due to insufficient strength or stiffness and due to leakage. When demoulding, surface damage could occur due to inadequate preparation of the formwork surface. After demoulding, curing measures could be insufficient. This chapter provides a more detailed overview of possible errors during casting. It can be said that proportioning errors of fine aggregates tend to have larger consequences than proportioning errors of the coarser aggregates. The aim of mixing is to obtain a good and homogenous dispersion of all constituent materials within the concrete. Sulfate attack in cementitious systems is a complicated issue.
