Evaluation of a 100 % Rap Recycling Project in Fort Wayne, Indiana

Abstract

A project site investigation involving a high RAP (close to 100 %) recycling has been evaluated to determine the performance differences with a control section, located in Fort Wayne, Indiana, one year after construction. The analysis involved cutting cores from the surface and determining recovered binder properties and mixture physical properties. Binder properties included standard PG grading in accordance with AASHTO M320 and the development of full master curves over the range of temperatures −30 to +80°C. From the master curve analysis was conducted to look at parameters such as cross-over frequency, rheology index and viscos-elastic transition temperature. The data from this testing has been used in a manner to judge the effectiveness of a recycling oil, particularly when inspecting the relationship between cross-over frequency and rheological index. Mixture testing included evaluation of strength properties by conducting tests in bending beam rheometers and the development of mixture master curves. At the current time little difference is seen in the performance of the 100 % RAP section compared to the control section, which provides significant support for continuing the effort to develop technologies for high percentage RAP recycling projects.

Performance of Asphalt Concrete Wearing Course (AC-WC) Utilizing Reclaimed Asphalt Pavement from Cold Milling Bound with 80/100 Pen Asphalt

“…The performance hot asphalt mixture with 100 % RAP in a road section compared to the control section, showed little difference. This results encourages the utilization of RAP [9].…”

Evaluación del efecto rejuvenecedor de bio-materiales sobre ligantes para mezclas con alto contenido de asfalto recuperado

“…In order to further evaluate the effect of the different binders over the RA, cross-over frequencies vs. rheological indexes (R-values) space (26) has been used as displayed in Figure 7. On one hand, cross-over frequencies are related to the elastic/viscous nature of binders, meaning that the higher the cross frequency the more viscous the material (due to the fact that the binder reaches 45° of phase angle at a higher frequency).…”

“…Crossover frequencies of binders decrease with ageing while R-values increase. Therefore, according to several authors (26), crossover frequency versus R-value space can be used to visually evaluate binders' ageing and rejuvenation.…”

Avaliação do comportamento de misturas asfálticas recicladas a quente com inserção de material fresado

“…Atualmente, em muitos países, são empregadas técnicas de reciclagem como forma de agregar valor à execução e à manutenção da vida útil dos pavimentos, visto que estas representam técnicas sustentáveis e alternativas economicamente viáveis. Portanto, visando a redução de custos e manutenção e, ainda, o aumento de sua vida útil aliado à questão ambiental, inúmeras tecnologias de reciclagem de pavimento estão sendo testadas e aplicadas por diversos autores [4][5][6][7][8][9].…”