Dosagem de mistura asfáltica com CAP 50/70 modificado com borra de petróleo

Abstract

Modificadores de ligantes asfálticos, tais como polímeros, borrachas de pneus moídos, borra oleosa de petróleo, dentre outros, vêm sendo estudados para melhor adequação destes às condições de uso. Contrariamente aos puros, os ligantes modificados apresentam comportamento reológico não-Newtoniano. Por essa razão, a dosagem de mistura asfáltica com ligantes modificados apresenta restrições às metodologias convencionais. Neste estudo, a modificação do ligante asfáltico CAP 50/70 foi realizada utilizando-se 10% e 20%, em massa, de masterbatch’s de borracha de pneus inservíveis com borra de petróleo, na proporção 15/85 (CM1) e 85/15 (CM2), seguindo a Norma DNER – ME 043/95. Os resultados mostraram que é possível dosar misturas asfálticas com o CAP 50/70 modificado com borra de petróleo seguindo-se a metodologia da referida Norma.

Empirical Property of Asphaltic Binder PA 50/70 Modified with Mixture of Industrial Waste

“…The quality of the asphalt coating road pavement bearing layer is directly related to its ability to withstand climatic actions and traffic density, agents that cause defects, such as wheel tracks, the appearance of thermal cracks, and fatigue [1]- [4]. Thus, the construction and maintenance of highways require strategies that meet the technological requirements imposed and sustainability, as these are engineering actions that involve high consumption of natural, non-renewable resources, which raise an alert about their availability on the planet [5].…”

“…It is important to emphasize that the use of residues as asphalt binder modifiers allows rationality in binder used in road pavement coating works. However, the qualification and acceptance of asphalt binders depend on the performance of numerous empirical tests based on probabilistic calculations, following recommended conditions that must be strictly followed, which justifies and motivates studies on empirical properties and HMA processing with modified asphalt binders [4]- [15].…”

“…Some studies had been adding amounts from 3 to 10% w/w. There were changes in empirical properties, such as viscosity, thermal stability during the modification of the binder, and mechanical properties of asphalt concrete [3], [4], [6]- [9], [16]- [19].…”

“…The oily sludge, residue generated throughout the production chain of the oil industry [7]- [9], [21], from a physical-chemical point of view, is a water/oil emulsion, and those arising from the bottom of a primary treatment tank oil have siliceous fragments [21]- [25]. However, due to its chemical composition, it is difficult to disperse in an asphalt binder, which makes the use of a dispersion facilitating substance necessary when applying it as a modifier of an asphalt binder [4], [8], [9].…”

Estabilidade e adesividade de ligante asfalto modificado com blenda de borra oleosa de petróleo com borracha de pneu

“…Outra linha de estudo, que vem apresentando resultados satisfatórios como modificante de ligante asfáltico, é a pré mistura de borracha de pneus com borra oleosa de petróleo advinda de tratamento primário e de destilaria de petróleo [5].…”