Ceramic properties of clay from the Asseiceira quarry at Tomar, Portugal


  • J. Coroado Instituto Politécnico de Tomar, Escola Superior de Tecnología
  • J. Marques Centro Tecnológico da Cerámica e do Vidro
  • C. Gomes Universidade de Aveiro
  • F. Rocha Universidade de Aveiro




ceramic, shrinkage, drying, thermal analysis, bending strength


The clay mined at the Asseiceira quarry near the city of Tomar, Portugal, has traditionally been used to manufacture hollow brick. However, since an assessment has shown the ceramic properties of the strata to vary, the quarry could potentially produce clay blends of different qualities to form raw materials appropriate for items demanded by different market segments, such as high quality facing brick and roof or floor tiles. The composition and texture of the various clay materials identified in the Asseiceira quarry were characterized using analytical techniques such as X-ray diffraction (XRD), X-ray fluorescence (XRF), Atterberg limits and grain size analysis The phases resulting from the thermal transformations taking place during drying and firing were identified with thermogravimetric (TG), differential scanning calorimetric (DSC), and thermodilatometric (TD) techniques. Finally, certain relevant ceramic properties such as linear shrinkage, bending strength and water absorption at 875 °C, 950 °C, 1025 °C and 1100 °C were determined on the raw material after extrusion.


Download data is not yet available.




How to Cite

Coroado, J., Marques, J., Gomes, C., & Rocha, F. (2005). Ceramic properties of clay from the Asseiceira quarry at Tomar, Portugal. Materiales De Construcción, 55(279), 5–16. https://doi.org/10.3989/mc.2005.v55.i279.193



Research Articles

Most read articles by the same author(s)