Abstract
Abstract The geomechanical properties of rock masses must be identified to assess their quality and employability; however, the methodologies may differ depending on the lithotype and analytical purposes. The present study aimed to estimate the not-well-known physical-mechanical properties of three types of carbonate rocks (calcarenite, calcilutite, and marble) of Sete Lagoas Formation, which are not recognized in scientific literature, southeast Brazil. These are important rocks from an economic point of view, as they comprise an important input for cement, fertilizers and construction material. Both physical indexes (apparent porosity, apparently dry and saturated specific mass, apparent absorption capacity and wave propagation velocity) and mechanical properties (uniaxial compression, point load and slake durability) were determined. Mechanical tests for these three rock types were correlated to those of other carbonate rocks from other countries, for comparisons. The results showed that the lithotypes under study are peculiar in terms of porosity, wave propagation velocity and strength. Also found were a very high durability and a very good correlation between specific mass and uniaxial compressive strength.
Highlights
IntroductionGeological materials are widely used in engineering works, such as components (foundations, flashboards, underground excavations, e. g.) as well as natural construction materials
Geological materials are widely used in engineering works, such as components as well as natural construction materials
The Bambuí Group covers an extensive area of the São Francisco Craton (SFC) extending from central southern Minas Gerais State to southern Bahia State and consists essentially of carbonates
Summary
Geological materials are widely used in engineering works, such as components (foundations, flashboards, underground excavations, e. g.) as well as natural construction materials. G.) as well as natural construction materials For this last use, the search for more competent geological materials that can be used in addition to Portland industry products is fundamental (Thomsen et al, 2016; Nezerkaet al., 2018). The basal unit of this group (Sete Lagoas Formation) presents some variation in carbonate lithotypes, as a result of different genesis and deposition environment. These rocks are very important as a raw material in the fertilizer and cement industry and as construction material. In Brazil, the articles that deal with this subject are scarce, and rarer are those that discuss its geomechanical characterization, especially for this particular use
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