Capacidade de suporte de fundações superficiais apoiadas em camadas de areia de fundição

Abstract

The environmental impacts caused by improper disposal of waste foundry sand have served for the construction industry would act as an ally to for the incorporation of this waste, reducing environmental impact and reducing the costs. Thus, the use of foundry sand residue as shallow foundations cementless base is a suitable alternative to the use of this material at the same time provides the use of shallow foundations in soils with low carrying capacity. Therefore, this study aims to determine the shallow foundations bearing capacity supported on cemented layers of foundry sand. Direct shear tests were executed to obtain the strength parameters the cimented materials. Were used used samples 5,0 x 5,0 cm natural soil and foundry sand with relative densities of 40, 70 and 100%, cemented with concentrations of 0, 3, 5, 7 and 10% Portland Cement Pozzolanic CP IV-32. For determining the bearing capacity of cemented layers were used analytical methods proposed by Vesic (1975), Meyerhof and Hanna (1978) and Purushothamaraj, Ramiah and Rao (1974). This analysis was used circular foundations 30, 60 and 90 cm in diameter laid on cemented layers of different thicknesses, and the relation between layer thickness (H) and diameter (D) ranged from 0,5 to 2,0. For cemented materials, can be say in general, the support capacity increased with increase of the cement content, the relative density and the H/D ratio. It was observed that, in this case, the method Vesic (1975) resulted in a capacity support well above Meyerhof and Hanna (1978) method, while the Purushothamaraj Ramiah and Rao (1974) method the support capacity not influenced to H/D ratios greater than 1.0, demonstrating that this method is not adequate for these cases.