WET CHEMICAL ANALYSIS METHOD FOR DETERMINING THE REACTIVE ALUMINA CONTENT OF NATURAL AND ARTIFICIAL POZZOLANS

摘要

The invention relates to a chemical method comprising a series of steps for determining the content of reactive alumina (Al2O3) in natural and artificial pozzolans that can be used to produce Portland clinker cements, as well as Portland cement concretes and mortars. The method can be used for all pozzolans, which, regardless of whether they are of natural or artificial origin, are considered materials formed by small crystalline fractions distributed randomly in a mostly vitreous and/or amorphous matrix, which small crystalline fractions contain the previously mentioned largest and most significant reactive fractions thereof: reactive silicon dioxide, SiO2r-, and reactive alumina, Al2O3r-. The content of reactive alumina can be determined using this method, as the amount of reactive alumina content dictates, to a large extent, whether or not the chemical durability thereof is that projected according to the natural aggressive medium considered: sulphates, chlorides or seawater, respectively.