Fatigue tests and damage analyses in modified binders and gap-graded asphalt mixtures with Reacted and Activated Rubber – RAR
Source abstract
Abstract
Several types of modifiers are currently studied, and among them, polymers and ground scrap tyre rubber stand out. The Reacted and Activated Rubber (RAR) is a new type of asphalt rubber that improves the engineering properties of the binder and mixtures. This research studied the rheological behaviour and fatigue performance of binders and gap-graded mixtures with RAR in quantities of 25% and 30%. The rheological characterisation tests were based on the Linear Viscoelasticity Theory and the principle of time-temperature superposition, which made it possible to elaborate the master curves. The fatigue performance was evaluated based on Continuum Damage Theory (CDT), getting the C-D curves and, in classic approach, getting the traditional Whöler curves. The tests on the binders were performed using the Dynamic Shear Rheometer (DSR) and asphalt mixtures tested in the Four-Point Bending (4PB) beam equipment. Modifications in AC 50/70 by RAR resulted in increased in PG, in softening point, rotational viscosity and density, and it reduced the penetration. Lower susceptibility to the frequency and temperature conditions of AB-R30 resulted in high fatigue life due to less sensitivity to the damage parameter. Comparison between the 4PB tests results of RAR produced mixtures tested at 20°C (MAB-R-25 and MAB-R30-1) and a field blend (MAB-RJ-122), expressed that the RAR modified mixtures exhibited superior fatigue life to the field blend, obtaining the MAB-R30-1 mix the highest performance. Tests with different temperatures for the same composition (MAB-R30-1, MAB-R30-2 and MAB-R30-3) and the same temperature for different compositions (MAB-R25 e MAB-R30-1) showed α parameter (CDT approach, C-D curves) with the similar behaviour of the parameter k2 (traditional approach, Whöler curves). Analysing the results, considering the research conditions (base binder, temperatures, tests, and methodologies performed) binder and mixture modifications using 30% RAR, proved to be more satisfactory.
Source: openalex_inverted_index · Quality: baseline
Research context
OpenAlex topics: Asphalt Pavement Performance Evaluation · Infrastructure Maintenance and Monitoring · Polymer Nanocomposites and Properties
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
Faculdade de Tecnologia, Departamento de Engenharia Civil e Ambiental, Universidade de Brasília, Brasília, Brazil
Funding
CAPES
References (47)
Show source-provided references
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