Investigation of Concrete Pumping Effects on Air-Entrained

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  • Entrained Air: Now You See It, Now You Don't | American

    Effect of Air Entrained Concrete on Strength of Concrete

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  • FIA EVALUATION OF TESTS FOR DETERMINING THE …

    Concrete pumps Concrete tests Laboratory tests 20, AsTR ACT Coofms m,as.fd If ne~casay &d Identfy by block ninber) mbtures and their effects on concrete pumpability. Part of the investigation All concrete mixtures were air entrained. It was concluded that …

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  • Factors Which May Influence Air Content - RussTech

    and maintain satisfactory concrete temperatures. III. Effects of Construction Practices Pumping Concrete – May result in air content reductions of 2%-3% at the discharge end of the pump boom. Higher air losses usually are the result of boom configuration causing free fall of the concrete and will sometimes actually create a vacuum in the pump

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  • A CRITICAL APPRAISAL OF THE AIR- ENTRAINMENT IN …

    The general effects of air entrainment are to increase the consistency, workability & durability, decrease density (unit weight), decrease strength and reduce bleeding & segregation. Air entrained concrete is more resistant to weathering cycles than plain concrete. Air entrainment leads to possible reduction in the sand content of the mix

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  • CIP 21 Loss of Air Content in Pumped Concrete

    Jun 21, 2020 · 5. "Effects of Pumping Air Entrained Concrete," Washington Aggregates and Concrete Association, March 20, 1991, 12 pp. 6.pump operator, and ready mixed concrete supplier Dyer, R.M., "An Investigation of Concrete Pumping Pressure and the Effects on the Air Void System of Concrete,"

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  • CONCRETE PUMPING EFFECTS ON ENTRAINED AIR-VOIDS. …

    Air entrainment and its effects in concrete • Aggregate

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  • [PDF] Fly Ash-Carbon Effects on Concrete Air Entrainment

    This paper describes the results of an investigation designed to gain further insight into interactions between FA-carbon and air-entraining surfactants, and the way in which these interactions impact on the stability of air voids dispersed in cement paste. The influence of different forms of powdered carbon and other hydrophobic particles on paste air entrainment and foam generation with a

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  • A CRITICAL APPRAISAL OF THE AIR- ENTRAINMENT IN …

    The general effects of air entrainment are to increase the consistency, workability & durability, decrease density (unit weight), decrease strength and reduce bleeding & segregation. Air entrained concrete is more resistant to weathering cycles than plain concrete. Air entrainment leads to possible reduction in the sand content of the mix

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  • Air entrainment and concrete - USDA

    affected. The air entrained pave-ment, laid next to the other sec-t i o n s, showed absolutely no scaling or D-cra c k i n g . Du r ing October 1942, 94 columns cast of concrete made with seve ra l types of cements and va ry i n g amounts of air entrainment we re Air entrainment and concrete

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  • The effects of pumping on the air content and void

    Dec 01, 2019 · They investigated the effects of spraying on the air content of wet mix shotcrete, and also concluded that the pumping and shooting processes substantially affected the air-void characteristics such as air content, spacing factor and specific surface area of air entrained into wet mix shotcrete.

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  • Effect of the entrained air void on strength and

    Oct 15, 2015 · Yu X M, Mei M R, Ren Q W. Experimental Research about the New Air-Entraining Agent Effect on Frost Resistance of Medium-Low Grade Concrete[J]. Concrete, 2009, (9): 69–71. Google Scholar [2] Chatterji S. Freezing of Air-Entrained Cement-Based Materials and Specific Actions of Air-Entraining Agents[J]. Cem. Concr.

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  • Concrete Pumping Effects on Entrained Air-Voids

    Concrete Pumping Effects on Entrained Air-Voids Author: William Elkey, Donald J. Janssen, Kenneth C. Hover Subject: Admixtures, Air entraining agents, Air voids, Fly ash, Freeze thaw durability, Lignosulfonate, Mix design, Pressurization, Pumped concrete, Stability (Mechanics), Water reducing agents Keywords

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  • Effect of Air-Entraining Agent LHD on the Technological

    Investigated coeffect of superplasticizer S-3 and air-entraining agents LHD (wood chemical additive) on workability, cohesion and air entrainment of concrete mix. Found that under introducing an additive LHD into the concrete mix comprising supeplastifikator S-3, the mobility of the concrete mix is reduced despite the fact that the additive LHD itself is a plasticizer.

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  • Air Content Loss in Pump | CZBY CONCRETE PUMP PARTS

    May 26, 2015 · "Effects of Pumping Air Entrained Concrete," Washington Aggregates and Concrete Association, March 20, 1991, 12 pp. Dyer, R.M., "An Investigation of Concrete Pumping Pressure and the Effects on the Air Void System of Concrete," Master's Thesis, Department of Civil Engineering, University of Washington, Seattle, Washington, 1991.

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  • Pumping Air Entrained Concrete

    Jul 02, 1994 · Unfortunately, pumping concrete can affect the air content of a concrete mix. This has caused concern about the possible loss of resistance of the concrete to freezing and thawing. The actual effect of pumping on the air content measured for the concrete is not consistent; in some cases air content has increased, while in others it has decreased.

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  • Effect of Accelerating Admixture on Properties of Concrete

    extreme cases, effects of cold weather may make the concrete an absolutely useless friable mass. On the other hand, if the concrete is sufficiently hardened when freezing conditions are likely to prevail, there will not be much harm to structural integrity of concrete. If the concrete has sufficiently hardened, the water that has been

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  • Concrete Materials

    "Effects of Pumping Air Entrained Concrete," Washington Ag- gregates and Concrete Association, March 20, 1991, 12 pp. Dyer, R.M., "An Investigation of Concrete Pumping Pressure and the Effects on the Air Void System of Concrete," Master 's Thesis, Department of Civil Engineering, University of Wash- ington, Seattle, Washington, 1991.

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  • Evaluating Air-Entraining Admixtures for Highway Concrete

    The standard is based on comparing concrete made with the tested air-entraining admixture with similar non-air-entrained concrete. The specifications require that the air content of the reference concrete should be 2 percent or less and the air content of tested concrete should be between 4 and 6 percent.

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  • Pumping Air Entrained Concrete

    When Pumping Air-Entrained Concrete 1 of 3 Things Happen: Experimental Investigation •Investigate the following before and after pumping •Both field and laboratory testing •Pumping effects: •Slump •Segregation •Air. Pumping Changes The Concrete 5" Slump Before the Pump After the Pump

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  • The curious case of pour 1B: Investigation of concrete

    Sep 18, 2018 · To have a measureable effect on the air content of the concrete, the pump would need to lose several gallons of oil. Given this and the highly unlikely pathways oil from the hydraulic system of the pumping truck would have to follow to contaminate the concrete, it was deemed unlikely oil from the hydraulic system would contaminate the concrete without being readily apparent to the operator and

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