Title Microstructure changes in hardened cement paste after freezing - thawing cycles /
Another Title Cemento akmens mikrostruktūros pokyčiai po cikliško šaldymo ir atšildymo poveikio.
Authors Skripkiūnas, Gintautas ; Nagrockienė, Džigita ; Kerienė, Jadvyga ; Janavičius, Eugenijus ; Girskas, Giedrius ; Špokauskas, Algimantas
DOI 10.5755/j01.ms.19.1.3835
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Is Part of Materials science = Medžiagotyra.. Kaunas : KTU. 2013, vol. 19, no. 1, p. 108-114.. ISSN 1392-1320. eISSN 2029-7289
Keywords [eng] hardened cement paste ; microstructure ; freeze-thaw cycle ; sodium silicate ; calcium chloride
Abstract [eng] This article analyses the results of the freezing – thawing with deicing salt test where changes in the microstructure of the surface layer in contact with aggressive environment of hardened cement paste produced with and without sodium silicate (hereinafter NTS) admixture were observed after freeze-thaw cycles in the presence of calcium chloride. After 56 cycles of freezing – thawing with deicing salt test micro-cracks and cavities were observed in the microstructure of the surface layer of hardened cement paste with and without NTS admixture. In the case of hardened cement paste with NTS admixture changes in the microstructure of the surface layer are less prominent: the number and size of cavities and micro-cracks are smaller. The test revealed that compressive stress, which before freezing – thawing with deicing salt test was very similar in hardened cement paste with and without NTS admixture (85.4 MPa and 82.8 MPa respectively), changed after 56 cycles of freezing – thawing with deicing salt test as follows: reduced by 39.5 % in concrete without NTS admixture and increased slightly (2.5 %) in hardened cement paste with NTS admixture. Based on the test results the authors arrived at the conclusion that sodium silicate solution can be effectively used to extend the useful life of hardened cement paste exposed to freeze-thaw cycles and affected by CaCl2.
Published Kaunas : KTU
Type Journal article
Language English
Publication date 2013
CC license CC license description