Air permeability and sorptivity of concrete modified with viscosity modifying agents

• Autorzy: Kubissa Wojciech , Prałat Karol , Kania Szymon

Identyfikatory

DOI

10.24425/ace.2022.140165

Warianty tytułu

PL

Przepuszczalność i sorpcyjność betonu wykonanego z użyciem dodatku modyfikującego lepkość

• Języki publikacji: EN

Abstrakty

EN

The paper presents the effect of a viscosity modifying admixture (VMA) on the air permeability, sorptivity and strength parameters (compressive and tensile strength) of concrete. The Atlas VM-500 admixture used in the research is a well-known additive that is commonly applied in concrete technology. Air permeability tests were carried out using the Torrent method. It was found that viscosity modifying admixtures (VMAs) have a significant impact on the permeability of concrete. The lowest values of the kT coefficient were obtained for specimens that matured in a water environment, and which contained 0.5% of VMA. This amount of additive reduced permeability by 34% when compared to the reference series of concrete. For air-conditioned specimens with 1.2% of VMA, the maximum decrease was 28% when compared to the reference samples. In the case of samples conditioned in an environment with an increased humidity, the maximum decrease occurred with a lower VMA content of 0.5% and amounted to 27% when compared to the reference samples. In addition, it was shown that the addition of 1.2% of VMA improved the compressive strength of concrete by 2.3% during its curing in water. In turn, this amount of VMA deteriorated its strength by 10.4% when the specimens were conditioned in air, and by 8.1% when they were conditioned in high humidity.

PL

Mineralne materiały budowlane, w tym także betony cementowe posiadają porowatą strukturę, które bardzo łatwo mogą penetrować ciecze i gazy znajdujące się w środowisku naturalnym. Dlatego też wprowadza się miarę, powiazaną z trwałością betonu tzw. przepuszczalność, którą określić można na drodze pomiaru wielkości charakteryzujących przepływ cieczy lub gazów. Bardzo często na potrzeby oceny potencjalnej trwałości betonu prowadzony jest pomiar nasiąkliwości lub sorpcyjności [6-8, 33]. W celu oceny przepuszczalności coraz częściej uznanie znajduje metoda Torrenta [19-21]. Pomiar ten ogranicza się do przepływu powietrza w kilkucentymetrowej, powierzchniowej warstwie betonu. Na przepuszczalność betonu mierzoną różnymi metodami, bardzo istotny wpływ ma jego stan wilgotnosciowy [29-32]. W przypadku metody Torrenta problem ten został przez jej twórców rozwiązany na drodze doświadczalnego ustalenia tego wpływu i wyposażeniu aparatu w sondę do pośredniego pomiaru wilgotności betonu, której zastępczą miarą jest jego oporność właściwa. Celem niniejszej pracy było określenie wpływu zastosowanych w betonach dodatków VMA na przepuszczalność powietrza oraz sorpcyjność, jak i parametry wytrzymałościowe (ściskanie i rozłupywanie) otrzymanych kompozytów, pielegnowanych przez 28 dni w zróżnicowany sposób.

Słowa kluczowe

EN

Torrent method; air permeability; viscosity; modifying agent; concrete composite

PL

dodatek modyfikujący; lepkość; kompozyt betonowy; metoda Torrenta; przepuszczalność powietrza

• Wydawca: Komitet Inżynierii Lądowej i Wodnej PAN ; Politechnika Warszawska, Wydział Inżynierii Lądowej
• Czasopismo: Archives of Civil Engineering
• Rocznik: 2022
• Tom: Vol. 68, nr 1
• Strony: 223--240
• Opis fizyczny: Bibliogr. 46 poz., il., tab.

Twórcy

autor

Kubissa Wojciech

• Warsaw University of Technology, Faculty of Civil Engineering, Mechanics and Petrochemistry, Płock, Poland

• https://orcid.org/0000-0001-5626-7917

autor

Prałat Karol

• Warsaw University of Technology, Faculty of Civil Engineering, Mechanics and Petrochemistry, Płock, Poland

• https://orcid.org/0000-0001-5116-0379

autor

Kania Szymon

• Warsaw University of Technology, Faculty of Civil Engineering, Mechanics and Petrochemistry, Płock, Poland (student)

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Uwagi

Opracowanie rekordu ze środków MEiN, umowa nr SONP/SP/546092/2022 w ramach programu "Społeczna odpowiedzialność nauki" - moduł: Popularyzacja nauki i promocja sportu (2022-2023).