Estudo das interações químicas, físicas e reológicas de ligante asfáltico modificado a temperatura intermediária com fibras de poliéster reciclado

Abstract

This paper researched the chemical, physical and rheological properties of a composite whose materials are asphalt cement CAP 50/70, an emulsifier chemical to improve the viscosity at intermediate temperatures and fibers of polyethylene terephthalate (PET) recycled from mainly of the reuse of the discarded bottles after consumption. Chemical analyzes were made of thermogravimetry (TGA), Fourier Transform Infrared (FTIR) and images captured in Scanning Electron Microscopy (SEM). The physical analysis were the most used to characterize the CAP, namely, penetration (P), Softening Point (AP) and Aging Termoxidative in RTFOT (Rolling Thin Film Oven Test). The rheological test consist of Viscosity Brookfield and by Dynamic Shear Rheometer (DSR). The addition of recycled PET fiber improved the performance of CAP 50/70 which was blended at temperatures lower than those commonly used in the asphalt industry. These are average temperature close to or higher than 160 °C. This study was the composite mixture to 140 °C. The addition of fibers caused the asphalt improve the physical specifications and decreasing Penetration and Softening Point. The results rheometry realized that the modification made the composite more viscous the temperature of 135, 150 and 177 ° C. The Phase Angle (δ) decreased and Module Complex (G*) increased the frequencies of study. SEM images show adhered to the present fiber petroleum asphalt cement. The FTIR showed the various components in the mixture, pure and modified, as well as PET. The TGA showed a general improvement in the conditions of thermal stability of the modified mixture