Characterization and physical, chemical and mechanical properties of the kaolinitic clays of the Northeast region of Pará state (Brazil)

This work was developed to study the behavior of two types of clays from São Miguel do Guamá-Pará region (northern Brazil) from a series of clay. Mixed and unmixed formulations of Strong and Weak Clay were tested. The raw materials were subjected to XRD, XFR, SEM and screening and sedimentation tests. It was elaborated the test components were pressed uniaxially in rectangular metal matrix. Physical and systematic properties were: Water absorption, apparent porosity, apparent mass production, linear firing shrinkage and flexural strength at three points. The microstructure of the ceramics was evaluated by SEM and XRD. The values presented as clays have favorable characteristics for the production of sealing blocks, showing that the best combination was a 30% strong clay (M4) mixture. (author)