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 ?
The air entrainment rate into a given zone is controlled by the conservation of momentum applied to that zone.
The effects of nozzle geometry on the liquid spray penetration have already been discussed in detail in the previous report [26] and are therefore only briefly summarized here: Nozzle N3 (with a k-factor of 2) produced sprays with shorter liquid phase penetration than nozzle N1 due to higher air entrainment and a lower mass flow rate.
If the pressure gradient decreases below equation (5) the upstream meniscus can no longer bridge the gap and air entrainment occurs.
2] studied the performance of the aerator of orifice spillway by varying the discharge, gate openings and cavity sub-pressures and presented the results with respect to jet length, cavity pressure and air entrainment coefficients in the form of non-dimensional plots and developed equations for jet length and air entrainment coefficient for the orifice spillway aerator.
Also detailed velocity measurements (Particle Image Velocimetry (PIV) or Laser Doppler Anemometry (LDA)) are needed to determine the velocity distribution in the two-phase unsteady flow due to the compressed air entrainment into the water column.
The condition of air entrainment can be expressed as follows [8]
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 ability to handle high degrees of air entrainment, and built-in smart diagnostics that alert you to problems before they impact the process.
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.