Durability Of Mortars With Natural Fillers In Aggressive Environnement
Résumé
Huge quantities of volcanic tuffs are found in Mako area (western Senegal). The high content of SiO2 is responsible of the pozzolanic properties of the tuffs when mixed to Portland cement. However, tuffs alterations could limit the pozzolanic effect: for example, the formation of clay decreases this effect but decrease also the porosity. The aim of this study is to highlight the benefits of this admixture when mortars where exposed in different sulphatic solutions. In sulphuric acid, specimen surfaces are covered with a superficial formation of gypsum and with amonium sulphate solution only few needles of gypsum appears. As it is shown by SEM observations and X-ray diffraction, deeper alterations decreases when cement is partially substituted with tuff.
Origine : Fichiers produits par l'(les) auteur(s)
Loading...