Scholarly record
USAGE OF BOTTOM ASH FROM COAL COMBUSTION TO REPLACE NATURAL AGGREGATE IN MANUFACTURING OF BUILDING MATERIALS
Abstract
Ash resulted from coal burning in steam generator boilers of large power plants is an industrial waste which rises major problems for the environment, both in terms of large quantities currently generated and quantities accumulated over time in specific deposits. Concerning the fly ash in the flue gas and trapped in electrostatic precipitators the recovery is 100% possible as raw material for cement used in construction manufacturing. For bottom ash virtually no current use exists, the amount being insignificant compared to the fly ash. Consequently, this type of industrial waste continues to be accumulated in large deposits, which alter the natural landscape in the vicinity of the power plant. The possibility to replace partially the natural aggregate used in building materials with coal bottom ash was analyzed within the CHARPHITE project. The article presents in detail the procedures and points out the results as tables and charts. Bottom ash from thermal power plants was considered as an alternative source of lightweight granular aggregate (bulk density from 0.7 to 0.9 g/cm3) and successfully used to manufacture building elements of 1.0 - 1.2 g/cm3 density class. In addition, due to the thermal stability achieved by the very way it is manufactured (coal combustion residue discharged at temperatures above 1100В°C) and when used in combination with suitable hydraulic binders, bottom ash provides the possibility of obtaining heat resistant lightweight concrete of the same density class and characterized by the maximum operating temperature up to 1150В°C. In such applications, bottom ash can substitute natural lightweight granular aggregates, such as calcined diatomite.
Publication Impact Profile
Publication details
References15
ASTM C618-17a, Standard Specification for Coal Fly Ash and Raw or Calcined Natural Pozzolan for Use in Concrete, ASTM International, West Conshohocken, PA, 2017, www.astm.org, accessed on 04.04.2018
Xu, G., & Shi, X., Characteristics and applications of fly ash as a sustainable construction material: A state-of-the-art review. Resources, Conservation and Recycling, vol. 136, pp. 95-109, 2018.
Hower, J. C., Groppo, J. G., Graham, U. M., Ward, C. R., Kostova, I. J., Maroto-Valer, M. M., & Dai, S., Coal-derived unburned carbons in fly ash: A review. International Journal of Coal Geology, vol. 179, pp. 11-27, 2017.
Phillips, B. L., Groppo, J., & Peronne, R., Evaluation of processed bottom ash for use as lightweight aggregate in the production of concrete masonry units. In International Ash Utilization Symposia and the World of Coal Ash conference, Lexington, Kentucky, USA, 2005.
Steven H. & Kosmatka William C. Special types of concretes - Design and Control of Concrete Mixtures, 13th edition (EB-001), chapter 18, pp 315-333, 1988.
Tayler G. V. & Daidone W. The use of bottom ash in the manufacture of clay face brick. World of Coal Ash (WOCA) Conference, Denver, Colorado, USA, 2011.
Braganca S.R., Zimmer A. VBergmann C.P. Use of mineral coal ashes in insulating refractory brick. Refractories and Industrial Ceramics, vol.49, issue 4, pp 320-326, 2008.
Anghelescu, L., Radu, S. M., Popescu, L., Cruceru, M., Chiroiu, C., & Diaconu, B., Fly ash from coal-fired power plants as raw material in building materials industry. Experimental assessment of thermo-physical properties, 14th International Multidisciplinary Scientific GeoConference, SGEM 2014 Conference Proceedings, Book 4, Vol. 1, pp. 245-252, 2014
Cruceru M et al., Obtaining building materials from coal ash after separation of the residual carbon, International Journal of Systems Applications, Engineering & Development, Volume 11, pp. 45-49, 2017
Predeanu, G., Volceanov, E., Abagiu, A. T., Cruceru, M., Slavescu, V., & Racoceanu, C.. Coal ash characteristics to assess its possible uses. International Multidisciplinary Scientific GeoConference: SGEM: Surveying Geology & mining Ecology Management, Sofia, Bulgaria, pp. 309-316, 2013.
WANG Cai-hong , LIN Xiong-chao, YANG Sa-sha , LIU Shu-qin , YOON Seongho , WANG Yong-gang, Evaluation of the thermal and rheological characteristics of minerals in coal using SiO2-Al2O3-CaO-FeOx quaternary system, Journal of Fuel Chemistry and Technology, Volume 44, Issue 9, pp. 1025-1033. 2016
Bruno V. et al, Undifferentiated Inorganics in Coal Fly Ash and Bottom Ash: Calcispheres, Magnesiacalcispheres, and Magnesiaspheres, Minerals, vol. 8, issue 4, no. 140, pp. 1-27, 2018
Anghelescu L., Cruceru M., Diaconu B., Bottom ash as granular aggregate to manufacturing of lightweight heat resistant concretes, International Journal of Energy and Environment, Volume 11, pp.168-171, 2017
Luxan, M. P., De Rojas, M. S., & Frias, M., Investigations on the fly ash-calcium hydroxide reactions , Cement and Concrete Research, Volume 19, Issue 1, pp. 69-80, 1989.
CHARPHITE Progress Report, http://www.utgjiu.ro/cercetare/CHARPHITE/progress/2016/Rezultate%20Etapa%20I%202016_UCB.pdf, accessed on 02.04.2018.
Citing literature
Number of times cited according to Crossref: 1
View or Download full articleAccess options
SWS access login
Login as SWS Scientific CommitteeLogin as SWS Scientific PartnerLogin as SWS AuthorAuthors and approved SWS contributors will read and export their own linked papers after identity matching by SWS profile, email and SGEM GlobalID.
For librarian assistance: [email protected]
Purchase Instant Access
- Article can be downloaded after successful payment.
- Article may be used according to SWS library access terms.
- Article cannot be redistributed.
