In this work several complementary techniques have been employed to carefully characterize the sintering and crystallization behavior of CaO-Al2O3-ZrO2-SiO2 glass powder compacts after different heat treatments. The research started from a new base glass 33.69 CaO-1.00 Al2O3-7.68 ZrO2-55.43SiO(2) (mol%) to which 5 and 10 mol% Al2O3 were added. The glasses with higher amounts of alumina sintered at higher temperatures (953 degrees C [lower amount] vs. 987 degrees C [higher amount]). A combination of the linear shrinkage and viscosity data allowed to easily find the viscosity values corresponding to the beginning and the end of the sintering process. Anorthite and wollastonite crystals formed in the sintered samples, especially at lower temperatures. At higher temperatures, a new crystalline phase containing ZrO2 (2CaO.4SiO(2).ZrO2) appeared in all studied specimens.