Considerações sobre misturas de solos tropicais estabilizados quimicamente para uso como camada de pavimento urbano

Abstract

In view of the lack of basic infrastructure in Brazilian cities, especially in regard to paving networks, it is of fundamental importance a study to ascertain the geological characteristics of the materials available and their potential use as pavement layer after incorporation of additives. This thesis aims at determining, in the laboratory, the mechanical results of soiladditive mixture, in order to evaluate the structural performance of chemically stabilized tropical soils. It also brings, specific objectives, comparing traditional additives - cement and lime - with another additive available in the brazilian market; analyzing the possibility of using these stabilized soils in urban pavement layers and obtaining reference results that may provide subsidies for pavement designers. This research develops from the collection of four (4) soil samples at different points in São Carlos/SP, with whom has been conducted a series of tests: California Bearing Ratio, Expansion and Compression Test. There was an evaluation of soils by determining the mechanical properties of the mixed soil and additive, in terms of carrying capacity, simple compression and expansion. The results were obtained after compression of the mixture in the test specimens and the use of standardized testing methodologies. After a long series of laboratory tests developed for each sample, a critical analysis of structural performance, primarily in its natural condition, then with the structural behavior of each of them, after the incorporation of additives. Research has shown that the best structural behavior of all samples collected in the different conditions of stabilization occurred with the sample ST-03 which, stabilized with 6% cement, obtained in laboratory satisfactory performance for use as the base layer of pavement.