Cement paste microporosity analysis: a comparison of different experimental techniques

• Autorzy: Bednarska Dalia , Koniorczyk Marcin

Identyfikatory

DOI

10.4467/2353737XCT.19.097.10879

Warianty tytułu

PL

Analiza mikroporowatości zaczynu cementowego: porównanie metod eksperymentalnych

• Języki publikacji: EN

Abstrakty

EN

Microstructure defines almost all material physical properties of a substance. Thus, its proper identification is essential for the assessment of material durability. Porous materials constitute the vast majority of those applied in civil engineering. The most important parameters describing a porous structure are the specific surface area, the shape and volume of pores and the pore size distribution. There are several methods which provide such results; however, each of them has some drawbacks. The main purpose of this paper is to compare results obtained by means of various methods commonly applied to the investigation of microstructure. These methods are mercury intrusion porosimetry (MIP), low temperature sorption of nitrogen and thermoporometry (TPM). The experimental research is conducted on aluminium oxide, which is characterised by unimodal pore size distribution and hardened cement paste prepared using portland cement (CEM I 42.5R with water-cement ratio equal to 0.5. The results obtained by the above-mentioned methods are thoroughly described and compared in this paper. Each of the presented approaches has some limitations; therefore, in order to receive a reliable description of porous microstructure, one has to apply at least two different experimental methods.

PL

Wśród materiałów budowlanych przeważającą większość stanowią materiały porowate. Dokładna znajomość mikrostruktury jest kluczowa w ocenie ich wytrzymałości i trwałości. Istnieje wiele metod eksperymentalnych służących do analizy struktur porowatych. W niniejszym opracowaniu porównane zostały następujące techniki: porozymetria rtęciowa (MIP), niskotemperaturowa adsorpcja azotu oraz termoporometria (TPM). Badaniom eksperymentalnym poddano dwa materiały. Pierwszy z nich, tlenek glinu, jest materiałem referencyjnym o unimodalnym rozkładzie porów. Zgodnie z deklaracją producenta dominująca średnica porów wynosi 7.3 nm. Drugim zastosowanym materiałem jest zaczyn cementowy przygotowany na bazie cementu portlandzkiego CEM I 42,5R. Stwardniały zaczyn charakteryzuje się skomplikowanym rozkładem porów. Opisane techniki analizy mikrostruktury są komplementarne. Aby uzyskać wiarygodny opis struktury wewnętrznej materiałów o skomplikowanym rozkładzie porów należy zastosować co najmniej dwie metody badawcze.

Słowa kluczowe

EN

porous materials; porous structure; cement paste; mercury intrusion porosimetry; low-temperature nitrogen adsorption; thermoporometry

PL

materiały porowate; struktura porowata; zaczyn cementowy; porozymetria rtęciowa; niskotemperaturowa adsorpcja azotu; termoporometria

• Wydawca: Wydawnictwo Politechniki Krakowskiej im. Tadeusza Kościuszki
• Czasopismo: Technical Transactions
• Rocznik: 2019
• Tom: Vol. 116, iss. 9
• Strony: 71--80
• Opis fizyczny: Bibliogr. 21 poz., wz., tab., wykr.

Twórcy

autor

Bednarska Dalia

• Department of Building Physics and Building Materials, Lodz University of Technology

autor

Koniorczyk Marcin

• Department of Building Physics and Building Materials, Lodz University of Technology

Bibliografia

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Uwagi

EN

Section "Civil Engineering"

PL

Opracowanie rekordu w ramach umowy 509/P-DUN/2018 ze środków MNiSW przeznaczonych na działalność upowszechniającą naukę (2019).