Physical and mechanical properties of fine hydraulic mixtures

Abstract

This two-part article deals with the problem of the fissuring of sandstones reconstituted from fine hydraulic mixtures packed and vacuum dried according to a patented procedure. During more than two years, the dimensional variations of these products were measured on slender test pieces reconstituted according to several models proposed for hydraulic concretes. In this part, we present the materials, the procedures used to mould the stones along with the calculations developed to obtain the exact composition of the test pieces. We also give densities, the mechanical strength and recorded time evolution of the deformations for different conservation modes which are representative of the possibilities of the envisaged production. In the second part, we present the method for describing the dimensional variations and the adaptations leading to the introduction of a crack index in choice of the formulas.