Healing Performance of Granite and Steel Slag Asphalt Mixtures Modified with Steel Wool Fibers
- 15 Downloads
This paper evaluates the induction healing performance of granite and steel slag asphalt mixtures modified with Steel Wool Fibers (SWF). A computerized tomography scan (CT-scan) was conducted to analyze microstructure and distribution of steel wool fibers in the mixture. Thermal conductivity was examined and heating rate was investigated with induction heating system. The healing performance was investigated by crack-heal cycles with three-point bending test. Dynamic modulus and repeated indirect tensile test were carried out to characterize the mechanical properties of asphalt mixtures modified with SWF. The results showed that the conductive properties and induction heating rate of asphalt mixture was enhanced by adding steel wool fibers and steel slag. The microanalysis results showed the agglomeration and uneven distribution of fibers in the mixtures when the mixed conductive additives exceed a certain dosage. It was found that heating rate of steel slag mixture was higher than that of granite mixture; however, its healing performance was slightly lower because of the cracking of weak steel slag. Finally, the mechanical test results demonstrated that the rutting resistance of asphalt mixtures was enhanced by adding steel wool fibers.
Keywordsinduction heating steel wool fibers self-healing steel slag repeated indirect tensile
Unable to display preview. Download preview PDF.
- AASHTO (2007). Standard method of test for determining dynamic modulus of hot-mix PG64-22 asphalt concrete mixtures, AASHTO TP 62-07.Google Scholar
- Ahmedzade, P. and Sengoz, B. (2008). “Evaluation of steel slag coarse aggregate in hot mix asphalt concrete.” Journal of Hazardous Materials, vol. 165, Nos. 1–3, pp. 300–305, DOI: 10.1016/j.jhazmat. 2008.09.105.Google Scholar
- Bhasin, A., Button, J. W., and Chowdhury, A. (2004). Evaluation of simple performance tests on HMA mixtures from the south central United States, Report No. FHWA/TX-03/9-558-1, Texas Transportation Institute, College Station, Texas.Google Scholar
- Christensen, D. W., Pellinen, T., and Bonaquist, R. F. (2003). “Hirsch model for estimating the modulus of asphalt concrete.” Journal of the Association of Asphalt Paving Technologists, vol. 72, pp. 97–121.Google Scholar
- Dai, Q., Wang, Z., and Hasan, M. R. M. (2013). “Investigation of induction healing effects on electrically conductive asphalt mastic and asphalt concrete beams through fracture-healing tests.” Construction and Building Materials, vol. 49, pp. 729–737, DOI: 10.1016/j.conbuildmat. 2013.08.089.CrossRefGoogle Scholar
- ISO standard (2008). Plastics-Determination of thermal conductivity and thermal diffusivity-Part 2: Transient plane heat source method, ISO Standard 22007-2, Switzerland.Google Scholar
- National Cooperation Highway Research Program (NCHRP) (2004). Mechanistic-empirical pavement design guide of new and rehabilitated pavement structures (MEPDG), NCHRP report 1-37A, Washington DC.Google Scholar
- Rudnev, V., Loveless, D., Cook, R., and Black, M. (2003). Handbook of Induction Heating, Marcel Dekker Inc., New York.Google Scholar