Potencialidade do conglomerado ferruginoso laterítico da ilha de São Luís do Maranhão utilizado no concreto de cimento Portland

Abstract

Lateritic concrete is already well known in Brazil and abroad and accepted worldwide in Civil Construction, as being concrete that uses lateritic rock or simply laterite, as gravel, and should be approached as a natural aggregate for unconventional Portland cement concrete in replacement to the conventional aggregate, which is granite rock. The present study stands out from other studies because the sedimentary rock, called the lateritic ferruginous conglomerate (aggregate), was used, as it came out of the crusher with 50.8mm or 2”, 38,1mm, or 1 ½ “and 25.4mm or 1”, providing in this crushing both the large aggregates and the fine aggregates, when crushed, as can be seen in the elaborated particle size curves and having as a comparative reference the theoretical curve of“ FULLER". The crushed conglomerate should have its particle size corrected, with particle size fractions of the same rock, to obtain maximum resistance to simple axial compression and that was tested in the concrete specimen, with maximum values reached between 31.70 to 33, 97Mpa. Still this rock reached 40Mpa of individual resistance to rupture. The rock has a variable chemical composition with SiO2 values ranging from 8.8 to 70.2% and Fe2O3 ranging from 23.8 to 75.6%. These results, presented here, can be found in CHAPTER 5 of this D.Sc thesis.