Determination of the elastic modulus of fly ash-based stabilizer applied in the trackbed

Vít Lojda, Martin Lidmila, Marek Pycha

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Citation (Scopus)
85 Downloads (Pure)

Abstract

This paper describes a unique application of a fly ash-based stabilizer in the trackbed of a railway main line. The key goals of the stabilizer application are to protect the subgrade against the ingress of rain water, to increase the frost resistance and to remediate the natural ground constituted of weathered rock. The stabilizer was designed as a mixture of fly ash, generated as a waste material from coal plants, gypsum, calcium oxide and water. The mixture recipe was developed in a laboratory over several years. In 2005, a trial section of a railway line with subgrade consisting of clay limestone (weathered marlite) was built in the municipality of Smirice. Since then, periodical measurements including collection of samples for laboratory evaluation of the fly ash-based stabilizer have taken place. Over the time span of the measurements, changes in mineral composition and development of fly ash transforming structures leading to the formation of C-A-S-H gel were detected. This paper describes the experimental laboratory investigation of the influence of dynamic loading on the elastic modulus of fly ash stabilizer samples and the development of permanent deformation of the samples with increasing number of loading cycles.
Original languageEnglish
Title of host publicationIOP Conference Series
Subtitle of host publicationMaterials Science and Engineering
Place of PublicationBristol, UK
PublisherIOP Publishing Ltd.
Number of pages8
Volume236
DOIs
Publication statusPublished - 23 Sep 2017
EventInternational Conference on Building up Efficient and Sustainable Transport Infrastructure - Czech Technical University in Prague, Prague, Czech Republic
Duration: 21 Sep 201722 Sep 2017
http://www.bestinfra.cz/

Publication series

NameIOP Conference Series-Materials Science and Engineering
PublisherIOP PUBLISHING LTD
Volume236
ISSN (Electronic)1757-8981

Conference

ConferenceInternational Conference on Building up Efficient and Sustainable Transport Infrastructure
Abbreviated titleBESTInfra 2017
Country/TerritoryCzech Republic
CityPrague
Period21/09/1722/09/17
Internet address

Keywords

  • fly ash
  • trackbed layers
  • resilient behaviour

ASJC Scopus subject areas

  • Civil and Structural Engineering
  • Materials Science (miscellaneous)

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