Radiological, Leaching, and Mechanical Properties of Cocombustion Fly Ash in Cements
Publication: Journal of Hazardous, Toxic, and Radioactive Waste
Volume 21, Issue 4
Abstract
Wastes are used increasingly as construction materials to make the building industry more sustainable. In this regard, the European standards indicate the characteristics to be met by fly ashes used as cement replacement for the concrete manufacturing; such requirements dictate that the fly ash must not contain dangerous substances or to emit radiation. However, the tests to be performed are not indicated, nor are the maximum limits that cannot be exceeded. In this study, two different fly ashes are analyzed, one of which is obtained from the traditional coal combustion and the other from the cofiring of 70% by weight of petroleum coke and 30% of coal. Several mortar mixes with different compositions were manufactured, and chemical, physical, mechanical, leaching, and radiological tests were carried out on them. Both ashes satisfy the normative requirements about their chemical properties, volume stability, and setting time. The compressive strength of the cocombustion ash mortars was lower than those made with coal ash, although they showed a high strength activity comparable to that obtained for portland cement, in compositions up to 20%. Cements with cocombustion ashes as additive have not presented leaching nor radiological problems with regard to standards and recommendations.
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References
Bentz, D. P. (2014). “Activation energies of high-volume fly ash ternary blends: Hydration and setting.” Cem. Concr. Comp., 53, 214–223.
CEN (European Committee for Standardization). (2003). “Characterization of waste: Leaching. Compliance test for leaching of granular waste material and sludges.” EN 12457-4, Brussels, Belgium.
CEN (European Committee for Standardization). (2005). “Methods of testing cements. III: Determination of setting times and soundness.” EN 196-3, Brussels, Belgium.
CEN (European Committee for Standardization). (2006). “Methods of testing cement. I: Determination of strength.” EN 196-1, Brussels, Belgium.
CEN (European Committee for Standardization). (2011). “Cement. I: Composition, specifications and conformity criteria for common cements.” EN 197–1, Brussels, Belgium.
CEN (European Committee for Standardization). (2013). “Fly ash for concrete. I: Definitions, specifications and conformity criteria.” EN 450-1, Brussels, Belgium.
Cerulli, T., Pistolesi, C., Maltese, C., and Salvioni, D. (2003). “Durability of traditional plasters with respect to blast furnace slag-based plaster.” Cement Concrete Res., 33(9), 1375–1383.
Chen, J., and Lu, X. (2007). “Progress of petcoke combusting in circulating fluidized bed boilers—A review and future perspectives.” Resour. Conserv. Recycl., 49(3), 203–216.
Dutch Ministry of Housing Spatial Planning and the Environment. (2007). Soil quality decree (Besluit bodemkwaliteit), The Hague, Netherlands.
EC (European Commission). (1999). Radiation protection 112: Radiological protection principles concerning the natural radioactivity of building materials, Brussels, Belgium.
EU-OSHA (European Agency for Safety and Health at Work). (2013). “Laying down basic safety standards for protection against the dangers arising from exposure to ionising radiation.”, Brussels, Belgium.
Generalitat de Catalunya. (2009). “Sobre la valorización de escorias siderúrgicas.”, Barcelona, Spain.
González, A., Moreno, N., Navia, R., and Querol, X. (2010). “Study of a Chilean petcoke fluidized bed combustion fly ash and its potential application in copper, lead and hexavalent chromium removal.” Fuel, 89(10), 3012–3021.
González, A., Navia, R., and Moreno, N. (2009). “Fly ashes from coal and petcoke combustion: Current and innovative potential applications.” Waste Manage. Res., 27(10), 976–987.
Hower, J. C, Thomas, C. A., Mardon, S. M., and Trimble, A. S. (2005). “Trimble. Impact of co-combustion of petcoke and coal on fly ash quality: Case study of a Western Kentucky power plant.” Appl. Geochema, 20(7), 1309–1319.
Kim, A. G. (2005). Leaching methods applied to the characterization of coal utilization by-products, ORISE Research Fellow National Energy Technology Laboratory, U.S. Dept. of Energy, Pittsburgh.
Kovler, K. (2009). “Radiological constraints of using building materials and industrial by-products in construction.” Constr. Build. Mater, 23(1), 246–253.
Leiva, C., et al. (2016). “Characteristics of fired bricks with co-combustion fly ashes.” J. Build. Eng., 5, 114–118.
NEN (Netherlands Standardization Institute). (2005). “Leaching characteristics—Determination of the leaching of inorganic components from moulded or monolitic materials with a diffusion test—Solid earthy and stony materials.”, Delft, Netherlands.
Rashad, A. M. (2015). “A brief on high-volume Class F fly ash as cement replacement—A guide for civil engineer.” Int. J. Sustainable Built Environ., 4(2), 278–306.
Sankaran Pillai, G., Shahul Hameed, P., and Mazhar Nazeeb Khan, S. M. (2016). “Radioactivity in building materials and assessment of risk of human exposure in the Tiruchirappalli District of Tamil Nadu, India.” J. Hazard. Toxic Radioact. Waste, 04016004.
Sanusi, O., Tempest, B., Ogunro, V., and Gergely, J. (2016). “Leaching characteristics of geopolymer cement concrete containing recycled concrete aggregates.” J. Hazard. Toxic Radioact. Waste, 04016002.
Sarabèr, A. (2014). “Co-combustion and its impact on fly ash quality; full-scale experiments.” Fuel Process. Technol., 128, 68–82.
Tkaczewska, E., Mróz, R., and Łój, G. (2012). “Coal-biomass fly ashes for cement production of CEM II/A-V 42.5 R.” Constr. Build. Mater., 28(1), 633–639.
Wang, S. (2015). “Co-fired biomass fly ashes in mortar: Reduction of alkali silica reaction (ASR) expansion, pore solution chemistry and the effects on compressive strength.” Constr. Build. Mater., 82(1), 123–132.
Wang, S., Anthony, E. J., and Abanades, J. C. (2004). “Clean and efficient use of petcoke for combustion and power generation.” Fuel, 83(10), 1341–1348.
Yao, Z. T., et al. (2015). “A comprehensive review on the applications of coal fly ash.” Earth-Sci. Rev., 141, 105–121.
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©2017 American Society of Civil Engineers.
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Received: Nov 3, 2016
Accepted: Jan 18, 2017
Published online: Apr 13, 2017
Discussion open until: Sep 13, 2017
Published in print: Oct 1, 2017
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