Lateritic soils, particularly abundant in tropical regions, have been successfully used in the construction of unbound layers of flexible pavements in Brazil since the 1970s. Despite their potential, these soils are often discarded or only recommended after stabilization processes, based on traditional parameters such as gradation requirements and Atterberg limits. This study investigates the mechanical characteristics of a lateritic soil from Roraima, focusing on its resilient modulus and permanent deformation properties, assessed through repeated load triaxial tests. Specifically, this research examines the effect of adding 20% sand on the mechanical behavior of the material. The results indicate that sand addition did not significantly improve the mechanical performance. The laterite–sand mixture exhibited an average resilient modulus (RM) of 744 MPa, lower than the 790 MPa of pure lateritic soil, suggesting that pure laterite remains suitable for pavement applications. Furthermore, the permanent deformation analysis revealed that the mixture with sand experienced nearly twice the plastic strain compared to pure laterite, which demonstrated superior accommodation under repeated loading. In the shakedown analysis, pure laterite exhibited a more stable performance, indicating greater durability in pavement applications. These findings highlight the importance of understanding the mechanical behavior of lateritic soils beyond conventional testing methods, emphasizing the potential of pure laterite as a viable alternative to enhance the strength and durability of pavement structures.

Durante um processo de análise laboratorial de solos, diversas variáveis influenciam na determinação do parâmetro pretendido. Inerentemente, cada uma das variáveis apresenta incertezas associadas, que podem estar relacionadas a fatores como calibração, leitura de dados, imperícia, etc. Diante do exposto, o presente artigo tem como objetivo determinar a incerteza das medições das deformações permanentes em solos lateríticos. Foram utilizados dados experimentais obtidos de ensaio triaxial de cargas repetidas realizados em areia argilosa do município de Mimoso do Sul, estado do Espírito Santo. A metodologia utilizada engloba as incertezas associadas à tensão confinante ( , à tensão de desvio ( ) e ao número de ciclos (N) , em geral informadas por certificado de calibração. As amostras foram divididas em dois grupos, diferenciados apenas pelo valor de aplicado. Os resultados das medições de dois grupos de ensaio são expressos em forma de intervalo que inclui a incerteza calculada. Como resultado, pode-se observar que a incerteza de medição para o caso proposto não representa variação significativa do resultado para aplicação em pavimentos. Além disso, destaca-se a grande influência da tensão confinante na avaliação desse parâmetro ao comparar os resultados dos dois grupos. Concluiu-se que apresentar a incerteza das medições evidencia a confiabilidade e qualidade dos resultados.

The aim of this article is to identify how multi-criteria decision support (MCDA) can help investment portfolios in transportation and logistics companies on the stock exchange. To develop this article, a stratification was carried out within BM&FBOVESPA with logistics and transportation companies presented on the Brazilian Stock Exchange. 16 transportation companies in the fundamentus data source. The data was collected from 5 financial indicators, selected according to the Principal Component Analysis (PCA) carried out by Basilio et al. (2018). The CRITIC method was used to generate the weights and normalize the decision matrix and the WASPAS method is used to classify assets. At the end of this stage, it was possible to classify the best alternatives for investing in transportation. After constructing portfolios, it was possible to see which company was most suitable for positive returns on investment. The result is a safe company to invest in logistics and transportation infrastructure in the Brazilian stock market through MCDA analysis and a sensitivity analysis. Research limitations/implications - Since the study is focused only on logistics and transportation companies, the study limited the alternatives with only 15 companies. An investor in transportation infrastructure economics can apply the conclusions of this article to other segments of the stock market. This study presents a methodology by merging the CRITIC method for generating weights and normalization and WASPAS with the normalization of the CRITIC method to build efficient investment portfolios.

Dimensionamento da capacidade operacional de carregamentos: simulação em uma base de distribuição de combustíveis / Sizing the operational capacity of loading: Simulation on a fuel distribution base

O transporte intermodal é importante para o planejador logístico na região Amazônica. Seu custo de manuseio e de transbordo não pode ser excessivamente oneroso para que operações isoladas e conjuntas sejam possíveis, facilitando a interoperabilidade. Este trabalho aponta as oportunidades de melhoria nos processos de carregamento e descarregamento na Amazônia. Em sua primeira seção, é abordado o contexto geral da intermodalidade, da integração entre as Forças singulares e como esta ocorre em países desenvolvidos. Posteriormente, utilizando-se da metodologia de estudo de caso, é abordada a intermodalidade do Exército Brasileiro na Amazônia, que possui, em sua estrutura, meios de transporte rodoviário, fluvial e aéreo. Por fim, é selecionado, por meio do método multicritério de apoio à decisão SAPEVO-M, o melhor equipamento para a transposição de cargas e integração logística. O resultado obtido monstra que o modelo observado para o Exército Brasileiro pode ser estendido para outras forças singulares, resolvendo um problema logístico de integração intermodal, além de colaborar para o desenvolvimento nacional.

The experience gained by developed countries shows that airport administrators seeks to increase their profitability, and regulatory agencies aims to guarantee quality, investment and fair rates. States that are interested in having self-sustaining airports find in the regulations for the private initiative or mixed capital society the change they want. With the goal of developing an aeronautical fare pricing model based on airport cost, this paper presents an application of the Tornqvist index and the markup pricing method to find the market price opportunity. One of the specific goals is to compare the financial results based on ANAC Resolution No. 350/14 with the results obtained in the proposed model. For the forecast of demand with the new price of the fare, it was used the concept of elasticity. The scenario used was Campinas / Viracopos Airport, from January 2014 to March 2017. During the quarter in which there are no infrastructure construction costs, the price of the fare is 0.04% higher than the fare ceiling envisaged by ANAC. An independent method based on cost and market opportunity, but on which the financial statement should be audited, is shown to be promising in terms of increasing airport revenue. Establishing qualitative parameters may be the best option to ensure the quality of social welfare for passengers, and if these goals are not achieved, then fines can be applied to the airport administrator.