What is the most relevant method for water absorption determination in ceramic tiles produced by illitic-kaolinitic clays? The mystery behind the gresification diagram

Abstract This study presents the 51 mixtures of ceramic clays characterized by using XRF, XRD, granulometry, and dilatometry analyses. After firing in a 1000–1250 °C range, water absorption (WA) according to EN standards boiling water, under vacuum, 24 h soaking is determined. The results indicated that there was high statistically significant correlation between standard methods, but testing vacuum gave highest saturation samples fired at 1200 °C 1250 °C. It determined these illitic-kaolinitic can be used produce floor tiles belonging BIIa group (water 3% 6%). also aimed reveal which method WA determination suitable read sintering interval from gresification diagrams, compared beginning as curves.