air entrainment


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air entrainment

[¦er in′trān·mənt]
(engineering)
The inclusion of minute bubbles of air in cement or concrete through the addition of some material during grinding or mixing to reduce the surface tension of the water, giving improved properties for the end product.

air entrainment

The occlusion of air in the form of tiny bubbles (generally smaller than 1 mm) during the mixing of concrete or mortar; used to improve its workability.
References in periodicals archive ?
In the present CV model, air entrainment occurs on top of the liquid, and the moving water column does not lose its mass at a constant rate due to gravity and shear effects at pipe walls.
For fires in vertical shafts (Chow and Han 2009), the flame surrounded by solid walls with an open ceiling and channels of flow caused by air entrainment through side openings can induce rotational air flow.
The novel high throughput method presented here allows for surfactants to be screened by evaluating their effect on air entrainment and stabilization in a clear coating formulation.
The Mark 10 included a flow accelerator or leak compensating system and the Mark 14 deleted the air entrainment control.
Due to this fact, in order to prevent excessive air entrainment, SPs should not only be compatible with cement, but also do not create the air-entraining effect in the paste.
22) showed that the onset of air entrainment could be postponed to a higher maximum coating speed even at very low concentration of non-interactive spherical PMMA particles in silicone oil.
The companion CD-ROM contains winding models, so that users can observe how material properties, winder type, and environmental effects such as air entrainment and temperature changes affect the stresses in a wound roll.
This is due to the fact that for a particular liquid Reynolds number air entrainment through the secondary entrance increases with decrease in gas-liquid mixing height, which in turn increases the bubble population in the mixing zone.
The center sponsors the Conference every two years as a means to advance the knowledge base in web handling and to provide engineers and researchers a forum to exchange ideas, present technological advances and discuss future directions This year's conference (IWEB2005) included three keynote speakers and a focus on the web handling topics of Lateral Mechanics and Wrinkling, Air Entrainment and Traction, Tension Control and Winding with a best paper award presented for each topic.
Most concrete recycling operations crush everything that comes in, and state highway engineers are concerned about the quality of the aggregates that made up the original concrete--whether there was air entrainment, perhaps alkali silica reactivity problem, etc.