Relationship between physical and mechanical properties of Brazilian silicate rocks

More than four hundred silicatic rock samples used in Brazil for cladding were characterized by means of physical and mechanic tests based on Brazilian (ABNT) standards. The most common type of rock samples were gneiss (38%) and granite (33%). The others were intermediary to basic rocks. The aim of this work was to find statistic relations between different tests, especially compressive strength and modulus of elasticity. The determined properties were apparent porosity (η), uniaxial compressive strength (σc), longitudinal ultrasonic pulse velocity (Vp) and static modulus of elasticity (Ee). The dynamics moduli were calculated from the pulse velocity and density values and so a proposed calculated static modulus of elasticity (Eec) from the uniaxial compressive strength. A proportion coefficient (k) was determined to allow the determination of the calculated static modulus of elasticity. The coefficient was obtained from the compressive strength (σc) and static modulus of elasticity (Ee) values from the tests: Eec = k.√σc, where k=120.81. The statistic treatment showed that the correlation between these and the other properties ranged from medium to weak.

QUEIROZ, Fábio Conrado de; QUITETE, Eduardo Brandau; DOZZI, Lúcia de Fátima Silveira; FRAZÃO, Ely Borges. Relação entre propriedades físicas e mecânicas de rochas silicatadas brasileiras. Revista Brasileira de Geologia de Engenharia e Ambiental, v.5, n.2, p. 78-87, 2015.

Access to the article in the newspaper site:,n%C3%BAmero2(2015)2017082114421913063.pdf

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