Study of the pozzolanic activity of an andesitic rock in Algeria Etude de l'activité pouzzolanique d'une roche andésitique en Algérie

This work is a part of the agreement programs Tassili N° 09 MDU 773 between Laboratory of Physic-chemistry Materials, USTO-Oran and Laboratory of Materials and Durability of Constructions (LMDC), INSA-UPS-Toulouse, France. The present study is an attempt to the research of new supply sources in admixtures and raw materials and the evaluation of local natural materials used in the manufacture of cement. It deals with the pozzolanic activity of the volcanic rocks and aims to compare the physical and mechanical characteristics of a mortar control made with cement CEMI 52,5R provided by Lafarge firm and of a mortar made with the same cement incorporated by different replacement rate of andesitic rock in a range of 0 - 40%. Volcanic rocks belonging to andesitic family and provided from Tipaza region (Western North of Algiers) were used in this study. The results found have shown that the cement made with andesitic rock may replace some Portland cements for a possible use in the field of construction.