Influence of Micro-Milled Secondary Materials Used as Binders in Low Level Stabilized Cold Recycled Asphalt Mixtures

Abstract:

This paper presents an experimental verification of the alternative options for using by-products or mineral waste materials applied to cold recycled mixtures with low level of stabilisation intended for low-volume road structures. To achieve the necessary refinement and a certain level of reactivity potential, the by-products were activated mechanically, i.e. pulverized in a high-speed disintegrator with respect to the lowest possible energy demands of the process and to the level of wear-and-tear of the working components in the milling machine. Such refined material, with average particle size of 10-15 μm, is applies as an active filler component allowing to partly substitute hydraulic binder in cold recycled mixtures. The application of such materials in structural pavement layers should increase the environmental benefits and result in added economic value. The experimental measurements taken focused on cold recycled mixtures with low level of stabilisation, modified by a combination of binders, or namely cement, mechanically activated concrete from reclaimed concrete pavement slabs originating from the Czech backbone D1 highway modernisation, mechanical-chemically activated fluid ashes from the Pilsen heat plant and foamed bitumen. Both basic volumetric properties and strength and deformation parameters were set for the purposes of evaluation of the characteristic measured in the experimental mixes.

• Periodical: Key Engineering Materials (Volume 731)
• Pages: 29-36
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.731.29
• Online since: March 2017
• Authors: Jan Suda*, Jan Valentin
• Keywords: Coal Combustion By-Product, Cold Recycling, Fly-Ash, High-Speed Milling, Mechanical-Chemical Activation

References

[1] J. Medvecová, P. Mužík, Fluid fly ash from thermal power plant Hodonín, Recycling 2004, ARSM, Brno, (2004) 103-110.

[2] P. Fečko, M. Kušnierová, H. Raclavská, V. Čáblík, B. Lyčková, Fly ash, Monograph, VŠB-Technical University, Ostrava, 191 (2005).

[3] M. Faltus, New types of hydraulic binders based waste materials, (2009).

[4] Ž. Sekulić, S. Popov, M. Đuričić, A. Rosić, Mechanical activation of cement with addition of fly ash, Materials Letters, 39 2 (1999) 115-121.

DOI: 10.1016/s0167-577x(98)00226-2

[5] F. Blanco, M. P. Garcia, J. M. Ayala, G. Mayoral, M. Ángeles, F. Garcia, The effect of mechanically and chemically activated fly ashes on mortar properties, Fuel, 85 14–15 (2006) 2018-(2026).

DOI: 10.1016/j.fuel.2006.03.031

[6] P. Baláž, Mechanochemistry in Nanoscience and Minerals Engineering, Chapter 2, High - Energy Milling, Springer, Hardcover, Netherland, (2008).

[7] K.J. Jenkins, M.F.C. de Ven, J.L.A. de Groot, Characterisation of Foamed Bitumen, 7th Conference on Asphalt Pavements for Southern Africa (CAPSA) (1999).

[8] M. Brennen, M. Tia, A.G. Altschaeffl, L.E. Wood, Laboratory Investigation of The Use of Foamed Asphalt for Recycled Bituminous Pavements. In: Asphalt materials, mixtures, construction, moisture effects and sulfur. Washington, DC: Transportation Research Board. (Transportation Research Record; 911), (1983).

DOI: 10.3141/2445-11

[9] M. F. Saleh, Effect of rheology on the bitumen foamability and mechanical properties of foam bitumen stabilised mixes, International Journal of Pavement Engineering, 8 2 (2007).

DOI: 10.1080/10298430601149650

[10] S. Maccarone, G. Holleran, D.J. Leonard, S. Hey, Pavement Recycling Using Foamed Bitumen. Proceeding 17th ARRB Conference, Part 3, (1994).

[11] AUSTROADS TECHNICAL REPORT, Review of Foamed Bitumen Stabilisation Mix Design Methods, Austroads Publication No. AP–T178/11, ISBN 978-1-921709-77-7, (2011).

[12] Wirtgen: Wirtgen Cold Recycling Technology, Manual, Wirtgen GmbH, first edition, Windhagen, Germany, (2012).

[13] G. Sheng, Q. Li, J. Zhai, Investigation on the hydration of CFBC fly ash, Fuel, 98 (2012) 61-66.

DOI: 10.1016/j.fuel.2012.02.008

[14] G. Sheng, Q. Li, J. Zhai, Feihu Li, Self-cementitious properties of fly ashes from CFBC boilers co-firing coal and high-sulphur petroleum coke, Cement and Concrete Research, 37 6, (2007), 871-876.

DOI: 10.1016/j.cemconres.2007.03.013