Análise Da Fadiga Em Misturas Asfálticas Recicladas À Quente Com Incorporação De Material Fresado

Abstract

O modal rodoviário atualmente, é o mais utilizado no Brasil, seja este para transporte de cargas e ou de passageiros. Visto isso, a busca por infraestruturas de transportes que exerçam desempenho e segurança ao tráfego, passa a ser uma necessidade primordial no momento de dimensionar novas estruturas de pavimentos. Sendo assim ao se fazer um breve paradoxo histórico, nota se que os pavimentos dimensionados no país, muitas das vezes não chegam na sua vida útil de projeto, tendo como defeitos mais recorrentes o trincamento por fadiga e deformação permanente, o que gera em um maior número de ações M&R, ou seja intevenções de manutenção e reabilitação, ocasionando consequentemente em um alto volume de material fresado, que é destinado aos bota-foras. Com intuito da melhor utilização e destino final adequado dos resíduos oriundos da fresagem, buscou se realizar distintas incorporações de material fresado à novas misturas asfálticas, com foco na fadiga, visto que o material apresenta uma elevada rigidez. Entretanto buscou se fazer misturas com 100% de incorporação, além de percentuais de 25% e 45%, avaliando até que quantidade incorporada proporciona ganhos e não comprometa a vida de fadiga da mistura asfáltica.

Hot recycled asphalt mixtures with the incorporation of milled material: analysis of the mechanical performance and economic presumption in the applicability of the technique

“…The importance of the use of alternative materials in the construction industry is due to the concern for the environment, due to the incessant exploitation of natural resources, since they can reach scarcity [1], and also due to the final destination of much of the waste that is produced daily in different service fronts [2]. The transportation infrastructure industry is one of the producers of waste, because of the large number of interventions that are realities in existing structures.…”

“…Damages that compromise the functionality of the infrastructure, and generate losses to operations, whose amount of losses of inputs on the highways represents on average 8% of what is produced in a harvest [8][9][10]. Coupled with the losses, there is an increase in the cost of transportation, whether fixed or variable, resulting from higher fuel consumption, maintenance of rolling stock, and travel time, all due to the functional and structural conditions of the pavement [2,5,10,11].…”

“…M&R actions, understood as pavement interventions and also as restoration techniques, are part of the pavement management system, which starts at the production and technological control of materials stage and ends at the final destination of the waste of a condemned pavement that has reached the end of its service life. These actions include every intervention performed on the structure, whether it is for the recomposition of the traffic lane and/or for signaling, and adaptations of the domain lane, so that both aim at returning the pavement to its functionality, to operate in comfort and safety [2,4,12].…”

“…The interventions performed on the traffic lane and the roadway platform are the most recurrent, giving rise to the RAP (reclaimed asphalt pavement) waste resulting from the process of thinning the asphalt concrete coating layer of the old pavement [13], and of asphalt mixtures machined outside the service specification [14], which are destined for disposal in dumps, and or even are left along the highways domain lanes, causing environmental concern [2]. Thus, due to the generation of waste, pavement recycling arises, which enables the reuse of this material in new pavement structures [15], combined with virgin materials, since the reduction of the number of virgin materials required, and given the principle of sustainability in reducing the impacts caused either for the design of a new road engineering project or to increase the capacity of an existing one with the rehabilitation of the pavement structure [16][17][18].…”

“…RAP is understood as the main residue resulting from the restoration services, and it is highlighted in the paving industry, the addition of this milled material as a component of new asphalt mixtures and granular layers as a granulometric stabilizer [2,14,[19][20][21]. Since each RAP sample consists of stone units (aggregate), covered by a mastic (filler and aged binder) forming lumps of the milled material [22], requiring in the dosage process that granulometric corrections are performed, and additions of rejuvenating agents and binders KEARNEY et al [23][24][25].…”