期刊
CEMENT & CONCRETE COMPOSITES
卷 135, 期 -, 页码 -出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.cemconcomp.2022.104848
关键词
Low air pressure; Air content; Yield stress; Viscosity; Surface tension; Deformability
This paper studies the rheology and air entrainment of fresh Portland cement mortar in simulated low air pressures. The results indicate that the rheological responses are related to the air entrainment in fresh mortar mixtures, and the volume changes of air voids are linearly related to the varying air pressures.
Air entrainment in cement-based materials is believed to be affected by low air pressure (AP) which is the atmospheric characteristic in high plateaus, and thus the rheology may be affected. This paper attempts to study rheology and air entrainment of fresh Portland cement mortar in simulated low APs. The results indicate that the rheological responses with the varying AP gradients are relevant to the air entrainments in fresh mortar mixtures. The volume changes of air voids in fresh mortars are linearly related to the varying APs, which is owing to not only the AP difference between the inside and outside air voids but also the additional pressure on the liquid films of air voids stemming from the surface tension changes. Moreover, the Bingham capillary number is calculated to account for the air void deformability. Then rheological parameters are correlated to the content and deformability of air voids in fresh mortars.
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