Análise da compacidade e da resistência da mistura de areia de fundição com solo argiloso

Abstract

The high costs of casting sand disposal for generating companies and its good properties for civil construction have stimulated research into alternatives for its reuse and, in this sense, its reuse in embankments offers alternatives for the used casting sand management. According to the Brazilian Foundry Association (ABIFA), it is estimated that in 2012, 3 million tons of casting sand were produced in Brazil. The current main destination of this waste are industrial landfills, which besides having a high cost, are a growing environmental concern for companies. This work had the goal of combining the casting sand waste, coming from pieces sandblasting, in mixtures of 35%, 50% and 65% of blasting sand with a clay soil and compare the compaction results and simple compression with the natural soil, 0% of blasting sand, in order to develop a new material that can be used in superficial foundations of in embankments for roads construction. At first, characterization tests of the soil and casting sand were performed. Next, compaction and simple compression test were performed. The compaction tests showed that with the addition of casting sand there is a reduction in the optimal humidity and an increase in the maximun dry apparent density of the mixture, being the best result obtained with the mixture of 65% of casting sand. The simple compression resistance tests showed that the natural soil, which means, that is, with 0% casting sand resists to higher tension before its rupture in comparison with the mixtures of soil and sand. Although initially the resistance decreased with the addition of casting sand to the soil, it was observed that there is an increase proportional to the added percentage after 35%.