ABSTRACT
We have seen in the preceding chapter that making high-performance concrete starts with the careful selection of the materials that are to be used. The materials that are presently used to make usual concrete with a compressive strength in the 20 to 40 MPa range may be inappropriate as soon as the water/binder ratio is lowered in order to achieve higher strength. It has also been shown how the selection of the materials used to make a high-performance concrete becomes more and more critical as the water/binder ratio is decreased further and compressive strength increases, but usually a concrete producer still has some choices to make.
