Caracterização e correlação entre a resistência e intensidade óptica em argamassas através de espectroscopia de emissão ótica com plasma induzido por laser (LIBS)

Abstract

In Brazil and around the world, the civil industry is a branch whose economic activity has a great influence on economic and environmental aspects. Much is invested in research aimed at controlling the quality of materials used in construction, such as mortar. In this context, this course conclusion work proposed to seek correlations, analyze and characterize mortars of different resistance classes through optical spectroscopy combined with mechanical resistance measurements. The techniques of Laser Induced Plasma Optical Emission Spectroscopy (LIBS) and compression testing were used. Samples were made with CPV and CPII-F32 cement, both with rupture ages of 1,3,7 and 28 days. The work developed was divided into four stages: (i) Preparation of samples; (ii) Compression test; (iii) Spectral measurements with the LIBS technique; (iv) Data processing and analysis. For the elemental analysis of the mortar, the results obtained showed a large presence of the Fe ion and elements characteristic of cement and aggregates, such as Si and Ca. The results obtained for the correlation of CPV cement were satisfactory, with a Pearson's R found of 0.91, demonstrating that there is a significant correlation. For CPII-F32 cement, Pearson's R did not show a good correlation, with a value of 0.73. With the results of this work, it is possible to verify that the LIBS technique proved to be satisfactory for characterization and calibration of CPV cement resistance measurements. This work plan is part of a scientific collaboration between the Laboratory of Optics and Quantum Information (LOIQ) of the Institute of Physics at UFU, the Laboratory of Civil Construction Materials (LabMAT) at UFU and the Department of Chemistry at the Federal University of São Paulo. Carlos (UFSCar).