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 language | English |
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Title of host publication | IOP Conference Series |
Subtitle of host publication | Materials Science and Engineering |
Place of Publication | Bristol, UK |
Publisher | IOP Publishing Ltd. |
Number of pages | 8 |
Volume | 236 |
DOIs | |
Publication status | Published - 23 Sept 2017 |
Event | International Conference on Building up Efficient and Sustainable Transport Infrastructure - Czech Technical University in Prague, Prague, Czech Republic Duration: 21 Sept 2017 → 22 Sept 2017 http://www.bestinfra.cz/ |
Publication series
Name | IOP Conference Series-Materials Science and Engineering |
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Publisher | IOP PUBLISHING LTD |
Volume | 236 |
ISSN (Electronic) | 1757-8981 |
Conference
Conference | International Conference on Building up Efficient and Sustainable Transport Infrastructure |
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Abbreviated title | BESTInfra 2017 |
Country/Territory | Czech Republic |
City | Prague |
Period | 21/09/17 → 22/09/17 |
Internet address |
Keywords
- fly ash
- trackbed layers
- resilient behaviour
ASJC Scopus subject areas
- Civil and Structural Engineering
- Materials Science (miscellaneous)