Estudo comparativo entre pavimento flexível e rígido na pavimentação rodoviária: um estudo de caso da obra da extensão da A venida Litorânea em São Luís – MA

Abstract

Sizing pavement requires a refined study of the requesting loads, most of our networks have sizing inconsistencies in the base, sub-base and pavement, other factors to be considered is the incorrect execution methodology, generating failures in our highways, being water, the main factor influencing the deterioration of the pavement layers, to solve this dilemma, bitumen-based materials were incorporated and other types of paving were studied, such as rigid ones. However, there are still doubts regarding the choice of the type of pavement, mainly due to the cost, durability and use which the pavement is intended to serve. Given this context, this work proposed to promote a comparative analysis of the advantages and disadvantages, time of use and costs involved in rigid and flexible paving. The case was used, the project for the extension of Avenida Litorânea in São Luís do Maranhão, with execution started in September 2018 and delivered in December 2020, with approximately 1,900 meters in length, the construction company was JCA Empreendimentos. With the data collected and after due analysis of the projects and documentation of the work, it could be verified in a direct analysis, using the same traffic lane widths and project length, that rigid paving is 517% more expensive than paving flexible, however, it is justified by the time of use and for being recommended for exclusive lanes of mass transport, and rigid paving in the medium and long term becomes more advantageous depending on the type of vehicle and traffic required, life useful can reach 20 years or more. On the other hand, for roads that do not require heavy and high traffic volume, it compensates for the flexible paving, which was used in the development's parallel and transversal roads. Simplistic and straightforward cost comparisons involving rigid and flexible paving do not make sense if other factors are not taken into account such as: the customer's desire and the project proposal, use to which each type of pavement applies, time of use and cost -benefit involved.