Estudo da distribuição espacial da dureza no concreto autoadensável

Abstract

This paper presents a study on how the properties of materials, e specially the hardness or resistance to indentation. Two types of materials are used for the study, expanded polystyrene and self-supporting concrete. The comparison of the methodology used with values obtained by numerical simulation with the purpose of validation of the same is presented. The experimental results of the spatial distribution of the hardness of expanded polystyrene and self-compacting concrete, the latter on three different scales. In numerical simulation, the correlation length obtained from the semivariogram is close to the value simulated mainly for longer lengths (Lcor) and using the Gaussian Model. The results of self-compacting concrete using the sclerometer, presented two regions, one harder and one less hard. In the macro indentation of concrete, the results also showed two regions present in the concrete, one more resistant and one less resistant, and a correlation that equals six times the maximum aggregate size. The micro indentation results showed the properties of the groute and the aggregate, being that the groute presented a greater hardness and the large aggregate presented two characteristic resistances of aggregate, one tougher than the other. The results of the macro indentation of the expanded polystyrene showed that in this material the hardness appears to be directly related to the grain size and the correlation length should be of the order of the grain size or lower than this value.