DBPapers
DOI: 10.5593/SGEM2015/B12/S2.105

STUDY OF THE IMPACT OF SHORT FIBRES INCLUSION ON THE GEOTECHNICAL PROPERTIES OF FLY ASH

T. Cihakova
Friday 7 August 2015 by Libadmin2015

References: 15th International Multidisciplinary Scientific GeoConference SGEM 2015, www.sgem.org, SGEM2015 Conference Proceedings, ISBN 978-619-7105-32-2 / ISSN 1314-2704, June 18-24, 2015, Book1 Vol. 2, 791-798 pp

ABSTRACT
Nowadays, one of the main sources of energy all over the world is still thermal energy from coal burning. Although the process of coal combustion has gone through many modernizations, one of the biggest disadvantages is production of the great amount of waste products. The fly ash is also one of the coal combustion products. In order to minimize the amount of stored fly ash in landfills and tailing dams, we try to find possibilities for further use of fly ash. Nowadays, the fly ash is mainly used in the construction industry. However, only small amount of produced fly ash is used. This article is focused on utilization of fly ash in the construction of earth structures. The article concentrates on the treatment method- reinforcing of fly ash by small plastic randomly oriented fibres. This method can be opportunity to improve fly ash geotechnical properties and thus enable the wider utilization. To study the influence of inclusion of short plastic fibres the laboratory tests are part of the research. The article describes the result of selected laboratory tests, for example unconfined compression tests, shear box test and triaxial test. The laboratory tests have proved that inclusion of short randomly oriented fibres positively influences the behaviour of fly ash. Reinforced fly ash can resist higher loads. Reinforced fly ash shows also very ductile behaviour. This is one of the biggest advantages of this method because the cracks in the construction can be eliminated. At the end of the article, the possibilities of the use in the construction of earth structures are presented.

Keywords: fly ash, fibre reinforcement, laboratory testing, earth structures