Thermal degradation of granite and marble industry reject (GMIR), a red clay (RC)and their composites were studied by non-isothermal
thermogravimetry (TG/DTG) in nitrogen atmosphere, differential thermal analysis (DTA) and derivative thermogravimetry(DTG)
in air atmosphere. Measurements were made in the temperature range of 25–1000,25–1200 and 25–1400C. The kinetic parameters
were determined by Flynn–Wall and Kissinger's methods. The results indicate the absent dominance of one mechanism of reaction,
and the composites show smaller values of kinetic parameters than GMIR or RC.