@ARTICLE{Kubissa_Wojciech_Air_2022,
 author={Kubissa, Wojciech and Prałat, Karol and Kania, Szymon},
 volume={vol. 68},
 number={No 1},
 journal={Archives of Civil Engineering},
 pages={223-240},
 howpublished={online},
 year={2022},
 publisher={WARSAW UNIVERSITY OF TECHNOLOGY FACULTY OF CIVIL ENGINEERING and COMMITTEE FOR CIVIL ENGINEERING POLISH ACADEMY OF SCIENCES},
 abstract={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 ���� 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.},
 type={Article},
 title={Air permeability and sorptivity of concrete modified with viscosity modifying agents},
 URL={http://journals.pan.pl/Content/122734/PDF-MASTER/art13_corr2.pdf},
 doi={10.24425/ace.2022.140165},
 keywords={torrent method, air permeability, viscosity modifying agents (VMA), concretes composites},
}