A comparative study of particle size distribution using analysis of variance for sedimentation and laser diffraction methods
AUTOR(ES)
Santana, G. L.
FONTE
Cerâmica
DATA DE PUBLICAÇÃO
15/08/2019
RESUMO
Resumo A análise granulométrica é uma ferramenta básica no processo de caracterização de materiais particulados, podendo ser obtida por vários métodos, destacando-se os métodos do densímetro e difração a laser. No entanto, estas técnicas são baseadas em princípios físicos distintos, que geram resultados diferentes, causando dúvidas. O objetivo deste trabalho foi estudar ambos os métodos com a uniformização da preparação de amostras seguindo a norma brasileira (NBR 7181). Amostras de caulim e quartzo foram utilizadas para representar as frações argilosa e arenosa do solo, respectivamente, com composições variando de 100% a 0% de teor de caulim, obtendo curvas de distribuição granulométrica e respectivas frações de cada composição. Esses resultados foram comparados estatisticamente por análise de variância (teste F) e correlacionados por meio de regressão linear. A comparação estatística indicou uma forte dependência entre os métodos do densímetro e difração a laser com e sem a preparação da amostra, indicando uma correlação direta com 95% de confiança.Abstract The granulometric analysis is a basic tool in the characterization process of particulate materials and can be determined through numerous methods, most notably the densimeter and laser diffraction methods. However, these techniques are based on distinct physical principles that can generate different results causing doubts. The objective of this paper was to study both methods, using a standardized sample preparation according to Brazilian standard NBR 7181. Kaolin and quartz samples were used to represent the clayey and sandy soil fractions, respectively, with compositions varying from 100% to 0% kaolin content. Granulometric distribution curves and respective fractions of each composition were determined. These results were statistically compared by analysis of variance (F-test) and correlated using linear regression. The statistical comparison indicated a strong dependence between the densitometer and laser diffraction methods with and without the same sample preparation, indicating a direct correlation with 95% confidence.
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