Abstract
The aim of this work was to study the use of coal waste to produce concrete paving blocks. The methodology considered the following steps: sampling of a coal mining waste; gravity separation of the fraction with specific gravity between 2.4 and 2.8; comminution of the material and particle size analysis; technological characterization of the material and the production of concrete paving blocks. The results showed that the coal waste considered in this work can be used to replace conventional sand as a fine aggregate for concrete paving blocks. This practice can collaborate in a cleaner coal production.
Highlights
IntroductionThe commercial coal production in the southern region of Brazil (comprising the Paraná, Santa Catarina, and Rio Grande do Sul states) has been occuring since the beginning of the twentieth century
The commercial coal production in the southern region of Brazil has been occuring since the beginning of the twentieth century
The results showed that the coal waste considered in this work can be used to replace conventional sand as a fine aggregate for concrete paving blocks
Summary
The commercial coal production in the southern region of Brazil (comprising the Paraná, Santa Catarina, and Rio Grande do Sul states) has been occuring since the beginning of the twentieth century. In the Santa Catarina State, the production occurs at the “Irapuá”, “Bonito”, and, mainly, “Barro Branco” seams. These Gondwanic coals are classified for the major part as a highvolatile bituminous in rank. The thickness of the “Barro Branco” seam ranges from 1.66 to 2.27 m, with an average value of 1.80 m. Net clean coal thickness is reduced to 0.47 - 1.48 m, due to the alternating layers of impure coal (shaley coal), carbonaceous shale, siltstone, and sandstones (Figure 1). Sometimes several centimeters thick, are common [1]
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