SciELO - Scientific Electronic Library Online

 
vol.37 issue2Response surface methodology for estimating missing values in a pareto genetic algorithm used in parameter designElasto-plastic model to determine the maximum force for shaft straightening process author indexsubject indexarticles search
Home Pagealphabetic serial listing  

Services on Demand

Journal

Article

Indicators

Related links

  • On index processCited by Google
  • Have no similar articlesSimilars in SciELO
  • On index processSimilars in Google

Share


Ingeniería e Investigación

Print version ISSN 0120-5609

Abstract

RUBIO, M. R.; MARTINEZ, D. J.; DAZA, C. E.  and  REYES, F. A.. Mechanical performance of HMA-2 modified with purified and unpurified carbon nanotubes and nanofibers. Ing. Investig. [online]. 2017, vol.37, n.2, pp.99-106. ISSN 0120-5609.  https://doi.org/10.15446/¡ng.¡nvest¡g.v37n2.58649.

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 fatigue-related issues and improve the long-term durability of flexible pavements.

Keywords : Carbon nanotubes; carbon nanofibers; hot mix asphalt; bitumen; pavements; fatigue; resilient modulus; rutting; master curves.

        · abstract in Spanish     · text in English     · English ( pdf )