Identificação das principais estruturas geológicas que interferem na qualidade dos blocos em serrarias de mármores e granitos

Abstract

Ornamental rocks are rocks in their natural state, extracted through blocks or plates. The extraction of ornamental stone blocks is carried out through open pit or underground mining. This activity consists of the production of economically viable blocks for processing. The extracted blocks are subjected to geological variations, thus directly affecting the quality standard of the materials. Materials with geological structures that compromise their use are generally rejected, which can cause losses for companies. When buying blocks and sawdust, the identification of geological structures and geological composition is very important, both for the negotiation of value and for the improvement. Its structure must be analyzed according to its main geological characteristics known in the market, such as mules, strings, crystals, color difference and cracks that are generally the main geological structures that we find. Therefore, we can classify the blocks as 1st, 2nd, 3rd that represent their quality standard. This work presents the main geological structures considered as defects associated with ornamental stone blocks sold nationally and internationally, these interfering in the quality and market value of the material. For this purpose, some rocks from a marble and granite sawmill chosen in the municipality of Cachoeiro de Itapemirim - ES were studied and classified. Of the analyzed materials, none showed first quality, being 50% of second quality and 50% of third quality.