Utilização de técnicas de fluorescência de raios-x e análise termodiferencial e termogravimétrica para caracterização de Cimentos Portland.

Abstract

Portland cement is the name used worldwide for the input used in construction, having its properties of start and endding of casting, fineness, strength, durability, etc., defined by its chemical composition, attributing to it some specific uses. The chemical characterization of a material is important due to the need of adequate selection based on the performance of the studied system, being able to describe aspects of composition, structure, aiming mainly to estimate the performance during the useful life of the material, minimizing the possibility of degradation and undesirable faults during the use of the product. In this study four types of Portland cements were collected in the ABNT 200 sieve (0.074 mm aperture) and submitted to the tests through thermody- gravimetric and thermogravimetric analysis and x-ray fluorescence, identifying the behavior of Portland cements against temperature rise and it was determined that the major chemical composition of all samples is Calcium Oxide (CaO), as well as the other constituents. It was observed that the results obtained corroborate with the technical norms and existing studies, indicating indicating that mass losses occur in fixed temperature ranges and that it is very important the detailed characterization of the cement, since it allows to recognize the behavior of elements and components produced with this material.