Détermination de la teneur en verre des cendres volantes et des laitiers ferreux

Abstract

In North America, there is an increased interest in the pozzolanic and cementitious properties of mineral wastes and in the potential for using these wastes as partial portland-cement replacement in concrete, either in the form of blended cement or as mineral admixtures at the mixer. Most waste materials are reactive when in a glassy state. A general theory, common to all these by-products, should explain the behaviour of glassy materials incorporated in portland cement in concrete. The purpose of this study was to find an accurate procedure to measure glass content in mineral wastes in order to predict their behaviour in concrete for offshore construction. A number of methods were used for measuring glass content in nine fly ashes and two blast furnace slags. The methodologies for two X-ray diffraction techniques were developed in this study. These two techniques are applicable to all classes of glassy waste materials. On the other hand, the quantitative X-ray diffraction method to evaluate the glass content of a material with a number of uncommon crystalline phases may be a very time-consuming technique. The non-crystalline X-ray diffraction approach cannot be used for materials which cannot be vitrified through rapid quenching.