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Mechanisms of Air Entraining of Proteins in Cementitious Materials
Langmuir, 2023While few prior studies examined the air-entraining properties of proteins in cementitious materials, the underlying mechanisms of proteins' air entraining and the interactions between proteins and cement have not been studied in the past. The significance of this article is to address this knowledge gap by investigating the effect of proteins on ...
Mohammad Sadegh Tale Masoule +2 more
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Air entrainment on a moving continuous web
Chemical Engineering Science, 2004Abstract The air boundary layer on a moving continuous web was experimentally investigated in a laboratory coating equipment. The boundary layer thickness was obtained by smoke visualization and measured by image analysis in the range 2.4×10 4 Re 5 . According to the web speed, three laminar flow mechanisms were observed, for which the air boundary
A. Arzate, P.A. Tanguy
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1990
While the early history of the use of air entraining admixtures is ambiguous, the author has heard, but not read, that the early Romans and Greeks added them to their pozzolanic mixes to increase their workability. Probably blood or animal fat was used for this purpose. Before proceeding further with the evolution of this class of admixtures, it should
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While the early history of the use of air entraining admixtures is ambiguous, the author has heard, but not read, that the early Romans and Greeks added them to their pozzolanic mixes to increase their workability. Probably blood or animal fat was used for this purpose. Before proceeding further with the evolution of this class of admixtures, it should
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Freezing of air-entrained cement-based materials and specific actions of air-entraining agents
Cement and Concrete Composites, 2003Abstract The freeze–thaw resistance of all cement-based materials is improved by incorporating a fine air bubble system in them. For acceptable life expectancy, incorporated air bubble volume should be about 25% of the cement paste. The specific surface of the air bubble system need to be above 25 mm2/mm3 and a spacing factor below about 0.16 mm ...
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Air Entrainment in Chute and Tunnel Spillways [PDF]
, 1992 In supercritical open channel flows air is entrained at the free surface. This process is called self-aeration. A method to estimate the flow properties is presented. New results on drag reduction in self-aerated flows are developed. It is shown that the mechanisms of drag reduction are associated with the presence of an air concentration boundary ...
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