The effect of air-entraining agent on the properties of mortars

• Autorzy: Blikharskyy Zinoviy , Markiv Taras , Sobol Khrystyna , Turba Yurii , Selejdak Jacek

Identyfikatory

DOI

10.24425/ace.2023.146072

Warianty tytułu

PL

Wpływ domieszki napowietrzającej na właściwości zapraw

• Języki publikacji: EN

Abstrakty

EN

The effect of the air-entraining agent on properties of mortar mixtures as well as on the compressive strength of hardened mortars was the objective of this study. Such mortars contain a certain amount of evenly spread closed air-voids pores with dimensions of 0.02-0.05 mm. On the one hand, the presence of a large volume of such air bubbles results in the reduction of mechanical properties of mortar. On the other hand, the use of this technological approach improves rheological properties of mortar mixture. The effect of the air entrainment on the flow, density, volume of entrained air of mortar mixture and compressive strength of hardened mortar was established. Obtained results show substantial increasing in the mortar flow at cement to sand ratio 1:2 by 1.8 times. The further decrease of C:S ratio results in a slight increase of the flow and even negligible its decrease at C:S = 1:4 compared to the reference mortar. The increase of the volume of entrained air results in the decrease of the density and compressive strength of mortar, but improve the resistance to freezing/thawing cycles. The results of this study can be a guide for mortar mix design to choose the most appropriate mix proportion to produce economically efficient mortars.

PL

Celem badań był wpływ domieszki napowietrzającej na właściwości mieszanek zaprawowych oraz wytrzymałość na ściskanie zapraw. Zaprawy takie zawierają pewną ilość równomierne rozprowadzonych, zamkniętych porów powietrznych o wymiarach 0,02-0,05 mm. Z jednej strony, obecność dużej ilości takich pęcherzyków powietrza powoduje obniżenie właściwości mechanicznych zaprawy. Z drugiej strony, zastosowanie tego podejścia technologicznego poprawia właściwości reologiczne mieszanki zaprawy. Określono wpływ domieszki napowietrzającej na urabialność, gęstość, objętość wprowadzonego powietrza oraz wytrzymałość na ściskanie zaprawy. Uzyskane wyniki wskazują na znaczny, 1,8-krotny wzrost rozpływu zaprawy przy stosunku cementu do piasku 1:2. Dalsze zmniejszanie stosunku C:S powoduje niewielki wzrost urabialności, a nawet znikomy jego spadek przy C:S = 1:4 w porównaniu do zaprawy wzorcowej. Wzrost objętości wprowadzonego powietrza powoduje zmniejszenie gęstości i wytrzymałości na ściskanie zaprawy, ale poprawia mrozoodporność. Wyniki badań mogą być wskazówką przy projektowaniu zapraw, aby wybrać najbardziej odpowiednie proporcje mieszanki w celu wytworzenia ekonomicznie efektywnych zapraw.

Słowa kluczowe

EN

air entraining agent; compressive strength; durability; frost resistance; mortar

PL

domieszka napowietrzająca; mrozoodporność; trwałość; wytrzymałość na ściskanie; zaprawa

• Wydawca: Komitet Inżynierii Lądowej i Wodnej PAN ; Politechnika Warszawska, Wydział Inżynierii Lądowej
• Czasopismo: Archives of Civil Engineering
• Rocznik: 2023
• Tom: Vol. 69, nr 3
• Strony: 147--156
• Opis fizyczny: Bibliogr. 26 poz., il., tab.

Twórcy

autor

Blikharskyy Zinoviy

• Faculty of Civil Engineering, Czestochowa University of Technology, Czestochowa, Poland

• https://orcid.org/0000-0002-4823-6405

autor

Markiv Taras

• Department of Building Production, Institute of Civil Engineering and Building Systems, Lviv Polytechnic National University, Lviv, Ukraine

• https://orcid.org/0000-0002-0865-3984

autor

Sobol Khrystyna

• Department of Highways and Bridges, Institute of Civil Engineering and Building Systems, Lviv Polytechnic National University, Lviv, Ukraine

• https://orcid.org/0000-0003-0798-413X

autor

Turba Yurii

• Department of Highways and Bridges, Institute of Civil Engineering and Building Systems, Lviv Polytechnic National University, Lviv, Ukraine

• https://orcid.org/0000-0003-3692-8890

autor

Selejdak Jacek

• Faculty of Civil Engineering, Czestochowa University of Technology, Czestochowa, Poland

• https://orcid.org/0000-0001-9854-5962

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