The relationship of phase and chemical compositions of a durable ceramic material of the fortification wall of the city of Thessaloniki (Greece) age more than 1000 years

Abstract

A ceramic material with an age of more than 1000 years has been studied. Plinth was used as a ceramic material for the construction of the fortress wall. In addition, the element analysis determined an increased content of carbon in the samples - 9,50 %. Increased carbon content in inclusions indicates the introduction of fuel into the raw material. The introduction of fuel into the raw material not only increases the porosity of the products, but also contributes to the uniform sintering of the ceramic shard and with an increased content of alkali oxides (R2O > 4 %), the formation of a glass phase up to 1000 oC.