Análise da resistência à tração de um solo da Formação Guabirotuba estabilizado com cal

Abstract

Throughout the development of the construction process, soil is increasingly applied in construction as the basis for large structures, such as bridges, tunnels, roads, airports, power plants, foundations, among others. Sometimes the local soil has unsatisfactory properties, because it is a complex and variable material, it becomes unfeasible its use in engineering. Aiming to solve this issue, the current geotechnical engineering successfully develops technologies for artificial soil stabilization through techniques of adding substances that improve soil properties. This search has selected certain amounts of a soil coming from the Guabirotuba Formation for artificial stabilization with CH-III hydrated lime powder. For this analysis, some samples were molded with different lime contents (0%, 3%, 6%, 8% and 16% lime with respect to the weight of natural soil) and different curing times (7, 14, 28 and 56 days), which were submitted to the tensile strength test (qt). Also, this study approached other important parameters in determining of geotechnical behavior of this soil, such as particle size composition, optimum moisture (ω), apparent maximum dry unit weight (γd), and real density of grains (Gs). The soil sample used in this research presented predominantly sand in its composition, Gs of approximately 2,263 g/cm3 , γd of 1,575 g/cm3 and ω 26,75%. All soil-lime samples showed significant qt gains in relation to the compressed natural soil, with an increase up to 20 times for the samples with 16% content of lime cured in 56 days. The studied soil-lime mixtures showed a relation of qt per simple compression strength (qu) around 0,192.