Mechanical performance of HMA-2 modified with purified and unpurified carbon nanotubes and nanofibers

The present study evaluates the mechanical performance of a Hot Mix Asphalt – Type II (HMA-2) modified with carbon nanotubes and carbon nanofibers (CNTF). CNTF were made by means the Catalytic Vapor Deposition (CVD) technique at 700° C using a Nickel, Copper and Aluminum (NiCuAl) catalyst with a Cu/Ni molar relation of 0,33. In order to properly assess HMA-2 performance, three different mixtures were analyzed: 1) HMA-2 modified with purified CNTF; 2) HMA-2 modified with non-purified CNTF and, 3) a Conventional HMA-2 (control). Samples manufactured in accordance with the Marshall Mix Design were tested in the laboratory to study rutting, resilient modulus (Mr) and fatigue. In addition to the aforementioned dynamic characterization, the effect of CNTF purification on the asphalt mixture’s mechanical properties was analyzed. In short, a comparative study was designed to determine whether or not CNTF should be purified before introduction into the HMA-2. This investigation responds to the growing demand for economical materials capable of withstanding traffic loads while simultaneously enhancing pavement durability and mechanical properties. Although purified CNTF increased HMA-2 stiffness and elastic modulus, non-purified CNTF increased the asphalt mixture’s elastic modulus without considerable increases in stiffness. Thus, the latter modification is deemed to help address fatiguerelated issues and improve the long-term durability of flexible pavements.

• Autores: Rubio, Mario Rodrigo; Martínez, Duván Julián; Daza, Carlos Enrique; Reyes, Fredy Alberto
• Tipo de recurso: Article of journal
• Fecha de publicación: 2017
• Institución: Universidad Nacional de Colombia
• Repositorio: Universidad Nacional de Colombia
• Idioma: spa
• OAI Identifier: oai:repositorio.unal.edu.co:unal/67573
• Acceso en línea: https://repositorio.unal.edu.co/handle/unal/67573; http://bdigital.unal.edu.co/68602/
• Palabra clave: 62 Ingeniería y operaciones afines / Engineering; Carbon nanotubes; carbon nanofibers; hot mix asphalt; bitumen; pavements; fatigue; resilient modulus; rutting; master curves; Nanotubos de carbono; nanofibras de carbono; mezcla asfáltica en caliente; bitumen; pavimentos; fatiga; módulo resiliente; ahuellamiento; curvas maestras
• Rights: openAccess
• License: Atribución-NoComercial 4.0 Internacional