Communications - Scientific Letters of the University of Zilina 2013, 15(4):9-17 | DOI: 10.26552/com.C.2013.4.9-17
Contribution to the Methodology of the Determination of the Thermal Conductivity Coefficients Λ of Materials Applied in the Railway Subbase Structure
- 1 Faculty of Civil Engineering, Department of Railway Engineering and Track Management, University of Zilina, Slovakia
The paper focuses on the methodology of determination of thermal conductivity coefficients λ of the construction materials of railway subbase. The determination of the thermal conductivity coefficients λ depends on the determination of the specific heat capacity and the time interval as sub-parameters. The paper presents specialized equipment for the determination of these parameters, the stated procedures and the method of test evaluation.The paper focuses on the presentation of the results of the experimental determination of the thermal conductivity coefficients λ of selected construction materials (clay, track ballast, fraction 32/63 mm, crushed aggregate fraction 0/32 mm and sandy gravel 0/32 mm). In the conclusion there is the confrontation of the values of the thermal conductivity coefficients λ stated by the experimental laboratory measurements with the values stated in TNZ 73 6312 and STN EN ISO 10 456.
Keywords: thermal conductivity coefficients, gravel sand layer, validation, railway structure
Published: November 30, 2013 Show citation
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References
- TNZ 73 6312 Design of Structural Layers of Railway Subbase (in Slovak), GR ZSR, August 2005
- CSN 72 1105 Determination of Thermal Conductivity Coefficient with the Method of Non-stationary Heat Flow (in Slovak), 1990
- KUPCULIAK, P.: Design and Assessment of Railway Subbase from the Point of View of Load by Climatic Factors (in Slovak), Dissertation thesis, Zilinska univerzita, SvF, KZSaTH, Zilina, 2011
- DOBES, P.: Optimization of Selected Conditions of the Railway Subbase Structure Design with Regard to Non-transportation Load (in Slovak), Diploma thesis, University of Zilina Faculty of Civil Engineering, Department of Railway Engineering and Track Management, 2012.
- STN EN ISO 10 456 Construction Materials and Products. Hygrothermal Properties. Tabulated Design (Calculated) Values and Procedures for the Determination of Declared and Design Values of Thermal Quantities, (ISO 10456: 2007).
- DURICA, P., VERTAL, M.: Verification of the Water Transport Parameter - Moisture Storage Function of Autoclaved Aerated Concrete - Approximately Calculated from a Small Set of Measured Characteristic Values, Communications - Scientific Letters of the University of Zilina, No. 4, 2011, pp. 92-97.
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