Execução e avaliação dos ensaios de Índice de Suporte Califórnia (ISC) do subleito e dimensionamento do pavimento utilizados na pavimentação da pista de rolamento do BRT Norte-Sul de Goiânia - Trecho Avenida Goiás Norte

Abstract

The present work, structured as a case study, analyzed the California Bearing Ratio (CBR) of the subgrade soil of the North-South Bus Rapid Transit (BRT), Avenida Goiás Norte section, in Goiânia, in order to to evaluate its importance and influence in the design of Portland cement concrete pavement. The calculation method was the same as that used in the running project of the Associação Brasileira de Cimento Portland (ABCP), adapted from the method of the Portland Cement Association / 84 (PCA/84). The methodology is based on Westergaard's theories for the dimensioning of the concrete slabs used, with respect to the tensile strength in the bending, which in turn is a function of the regression coefficient of the top of the sub-base (immediately below the underside of the concrete slab). This regression coefficient was obtained through tables and abacuses that correlate CBR and k for a certain thickness and type of sub-base adopted. From the collected samples, the compaction and CBR tests were carried out, obtaining very satisfactory support and expansion values and similar to the results of the executing consortium for the same study section, which resulted in a thickness sizing equal to what is running.