AIR ENTRAINMENT AGENT DOWNLOAD
AIR ENTRAINMENT AGENT DOWNLOAD!
Air-entraining admixtures cause small stable bubbles of air to form uniformly The benefits of entraining air in the concrete include increased resistance to. Super Air Plus is an air entraining agent designed for job-site addition. Packaged in small, water-soluble bags. Air entrainment is the intentional creation of tiny air bubbles in concrete. A concrete maker introduces the bubbles by adding to the mix an air entraining agent, a surfactant (surface-active substance, a type of chemical that includes detergents).
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In this respect, to maintain a constant air air entrainment agent, air-entraining admixture dosages must usually be modified depending on the carbon content, LOI, fineness, and the amount of organic material in the fly ash.
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For instance, fly ashes with LOI values equal to or greater than 3 percent will generally require a significant increase in the dosage of the air-entraining admixture.
In contrast, fly ashes with LOI values less than 3 percent will generally require no appreciable increase in the air-entraining admixture dosage.
Factors affecting the LOI value in Class F fly ash include the type of coal burned, moisture content of the fuel, type of burner, combustion temperature, boiler demand, weather conditions, type of ash collection system, pollution control devices and techniques.
A typical air-entraining admixture is neutralized vinsol resin. Tests have shown that air-entraining admixtures comprised of neutralized vinsol resin do not perform well in cementitious mixtures having fly ashes with high LOI values. In this respect, carbon particles or char i.
Accordingly, in Portland cement PC concrete containing high LOI fly ash, the carbon particles tend to absorb the air-entraining admixture liquor or liquid film i.
This action allows the air globule to escape. The problem of admixture absorption by carbon particles is further increased, if for example, the concrete mixture is subjected to prolonged mixing periods, or air entrainment agent the concrete mixture is subjected to pressure such as would be experienced within a pump line.
The foregoing conditions can further complicate predicting an air content per dosage of air-entraining admixture in Portland cement PC concrete mixtures having high LOI or high carbon fly ash.
The air-entraining agent is comprised of water, a high-polymer protein, polyvinyl alcohol, and a soap gel.
Air-entraining agent | Article about air-entraining agent by The Free Dictionary
It should be understood air entrainment agent the term "soap" as used herein refers to any metallic salt of an acid derived from a fat. According to another aspect of the present invention there is provided a method for producing the air-entraining agent.
The method is comprised of the steps of mixing together water, a high-polymer protein powder, a polyvinyl alcohol aqueous solution and a soap gel solution. According to a second preferred embodiment of the present invention there is provided an air-entraining agent for introducing controlled percentages of entrained air into cementitious mixtures having fly ash.
The air-entraining agent is air entrainment agent of water, a colloid, a soap gel solution, a high-polymer protein powder, and a polyvinyl alcohol powder.
Air entrainment agent to another aspect of the present invention there is provided a air entrainment agent for producing the air-entraining agent according to the second preferred embodiment. The method is comprised of the steps of mixing together water, a colloid, a soap gel solution, a high-polymer protein powder, and a polyvinyl alcohol powder.
A homogenization process follows within 30 minutes.
It is an object of the present invention to provide an air-entraining admixture which overcomes the absorption characteristics of the carbon or char particles found in fly ash compositions.
It is another object of the present invention to provide a chemical air-entraining agent which produces and maintains a predictable air void air entrainment agent within cementitious mixtures and slurry having high LOI or high carbon fly ash.
It is yet another object of the present invention to provide a surface active air-entraining admixture that produces a bubble network with a high viscosity, metastable lamellae and resists absorption.
It is air entrainment agent another object of the present invention to provide an air-entraining admixture that does not separate during storage.
A surface active air-entraining admixture that produces a bubble network with a high viscosity, roetastable lamellae and resistance to absorption, allows Portland cement PC concrete mixtures having high LOI or high carbon fly ash to be predictably air entrained.
In this regard, the air-entraining agent may be air entrainment agent directly or as a pre-formed foam. The direct dosage intentionally traps air during the mixing process. With respect to the pre-formed foam method, the air-entraining agent is introduced as a pre-formed foam through the use of a conventional foam generator.
In this respect, when the air-entraining agent is to be introduced as a pre-formed foam, it will take the form of a dispersion network of known volume.
Even in situations where air losses are air entrainment agent due to the high LOI of the fly ash, prolonged mixing periods, loss through pumplines, etc. In flowable slurry mixtures i.