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Acta Geodynamica et Geomaterialia

 
Title: ANALYSIS OF INNER STRUCTURE CHANGES OF CONCRETES EXPOSED TO HIGH TEMPERATURES USING MICRO X-RAY COMPUTED TOMOGRAPHY
 
Authors: Sitek Libor, Bodnárová Lenka, Souček Kamil, Staš Lubomír and Gurková Lucie
 
DOI: 10.13168/AGG.2015.0009
 
Journal: Acta Geodynamica et Geomaterialia, Vol. 12, No. 1 (177), Prague 2015
 
Full Text: PDF file (3.2 MB)
 
Keywords: X-ray tomography, concrete, cement paste, aggregate, high temperature
 
Abstract: The X-ray Computed Tomography (X-ray CT) represents a progressive non-destructive method of analysing the inner structure of materials. The method was used for monitoring changes in inner structure of concrete samples of different composition before and after their exposure to various thermal loads. Eight types of concrete samples were prepared which differed by cement and aggregate types. We intentionally used such composition of concrete mixtures which increased their resistance to high temperatures. The inner structure of samples was analysed using the micro X-ray CT before the thermal loading and after exposure of samples to temperatures of 600°C or 900°C. Damages and character of changes in the inner structure caused by high temperatures were influenced by the character of cement and aggregate we used. The analysis of obtained results is presented in the paper.