Possibilities of laser diffraction application for comparison of pozzolan materials

A new method for studying pozzolanic activity in materials by following the evolution of the granulometric distribution curves obtained with a laser diffraction technique, is presented. The behaviour of the selected material was studied in parallel in two different liquids: water and a lime-saturated solution. The granulometric evolution of the materials with pozzolanic activity was different from that of the inert materials when exposed to a reactive liquid such as a lime-saturated solution. These findings prove the effectiveness of this method for assessing the pozzolanic activity of d(lferent materials.