pumping air entrained concrete

specializing in the production of large, medium and small concrete mixers, concrete mixing stations, stabilized soil mixing stations and other equipment. It is a heavy industry enterprise integrating R & production and sales.

Pumping Air Entrained Concrete

When Pumping Air-Entrained Concrete 1 of 3 Things Happen: Pumping Changes The Concrete Before the Pump After the Pump 6.1% Air 3.5% Air. Why Does Pumping Impact Air? 1. Pressure Mechanism 2. Vacuum 3. Impact. Where Should We Measure Air? Before the Pump After the Pump OR. What Does the Engineer Say?

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Research - Concrete Pumping Effects on Entrained Air-Voids ...

Jul 02, 1994  Concrete Pumping Effects on Entrained Air-Voids. Pumping is a frequently used method of efficiently transporting concrete from the delivery vehicles to the formwork. 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.

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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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Concrete Pumping Effects on Air-Entrained Voids in ...

Placing concrete using a concrete pump has placement advantages due to the increased speed, accessibility, and convenience of operation. Unfortunately, the pumping of air-entrained concrete is known to affect the fresh air content in the fresh concrete.

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Why do we lose air while pumping air entrained concrete ...

Sep 03, 2020  Pumping air entrained concrete is a significant challenge for the concrete industry. It is common to lose 1% to 3% volume of air during pumping. This loss ...

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Examination of Air Entrainment Stability Factors of Pumped ...

various factors on the pumping of air-entrained Portland Cement Concrete and the circumstances surrounding the loss of air that can occur during the pumping of fresh concrete. The mechanism of entraining concrete with air is presented to focus on the instability of the air bubbles while

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

Jul 26, 2018  As he became familiar with pump issues and the common belief that pumping caused air to disappear from the concrete, he became interested in researching the topic. Ley has studied concrete and air entrainment for almost 16 years, including running experiments at Oklahoma State using a test pump that provides real-world simulations.

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CIP 21 - Loss of Air Content in Pumped Concrete

Queries on Concrete, Concrete International, August 1992, p. 71. 5. “Effects of Pumping Air Entrained Concrete,” Washington Ag-gregates and Concrete Association, March 20, 1991, 12 pp. 6. Dyer, R.M., “An Investigation of Concrete Pumping Pressure and the Effects on the Air Void System of Concrete

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WEBINAR - Pumping Air Entrained Concrete and the Super Air ...

Jan 28, 2021  WEBINAR - Pumping Air Entrained Concrete and the Super Air Meter This presentation will discuss changes in the volume of air entrained concrete in pumped concrete. The work shows that during pumping the air volume will decrease and if measured immediately after pumping will be lower than what is found in the final concrete.

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How to Use Air-Entrained Concrete ... and Why You Should ...

Dec 01, 1963  The strength of air-entrained concrete depends on the water/cement ratio as it does in non-air-entrained concrete. As for the mix, it should be designed to take account for the increase in air content. The water content for an air-entrained mix will be 3 to 5 gallons per cubic yard less than for a non-air-entrained mix having the same slump.

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Concrete Pumping Effects on Air-Entrained Voids in ...

Unfortunately, the pumping of air -entrained concrete is known to affect the fresh air content in the fresh concrete. This has caused concern about the durability of concrete in environments where the concrete will experience repeated freezing and thawing cycles.

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Air void systems in pumped concrete - Iowa State University

When you pump air entrained concrete one of three things will happen: 1. The air will go down 2. The air will go up 3. The air will stay the same - Ken Hover Most people are worried about this and so it is common to sample after the concrete pump. •

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Examination of Air Entrainment Stability Factors of Pumped ...

various factors on the pumping of air-entrained Portland Cement Concrete and the circumstances surrounding the loss of air that can occur during the pumping of fresh concrete. The mechanism of entraining concrete with air is presented to focus on the instability of the air bubbles while

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Air entrainment and concrete - USDA

Air entrainment and concrete Some things every contractor should know about a combination that assures longer-lasting and more attractive concrete This photomicrograph of air entrained plastic concrete suggests how minute bubbles of air function as very small ball bearings which make the concrete

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Air Entrainment Report American Concrete Pumping Association

Air Entrainment Report. Safety Publications. Non-member price: $50.00. member price: $10.00. The compilation of a series of tests conducted to compare the air content, air void system parameters and freeze-thaw durability of air-entrained concrete as influenced

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Loss of Air Content in Pumped Concrete — What, why, how ...

Discuss the necessity for care in pumping air-entrained concrete, and list the precautions to take when pumping it. Maintain communication between all parties during the placement process. Before the pour, plan alternative pump locations and decide what will be done if air loss occurs. Be prepared to test for air content frequently.

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CIP 21 - Loss of Air Content in Pumped Concrete

Discuss the necessity for care in pumping air entrained concrete, and list the precautions to take when pumping air-entrained concrete. Maintain communication between all parties during the placement process. a) Before the pour, plan alternative pump locations and decide what will be done if air loss occurs. Be prepared to test for air content ...

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Air and pumping of concrete - Concrete Engineering general ...

Aug 16, 2011  Air is one more method used to change the viscosity of the mix. It makes it more fluid while maintaining the same water-cement ratio. RE: Air and pumping of concrete. JAE (Structural) 10 Aug 11 08:32. Agree - and I once had a contractor add air to a lightweight mix - pumped up three stories for a topping pour.

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Air Apparent Concrete Construction Magazine

Oct 01, 2018  The American Concrete Pumping Association is supporting research conducted by Tyler Ley at Oklahoma State University into entrained air content after pumping. Conventional wisdom is that pumping reduces air content, but Ley’s research seems to show that isn’t necessarily the case. Rather, his theory is that the air dissolves into the ...

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How to Use Air-Entrained Concrete ... and Why You Should ...

The strength of air-entrained concrete depends on the water/cement ratio as it does in non-air-entrained concrete. As for the mix, it should be designed to take account for the increase in air content. The water content for an air-entrained mix will be 3 to 5 gallons per cubic yard less than for a non-air-entrained mix having the same slump.

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CIP 21 Loss of Air Content in Pumped Concrete

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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Air Entrainment - Concrete Pumping

Aug 03, 2009  The Roughneck hose was made to reduse the air loss, by keeping the pipes full to the end of the tip hose, in otherwords, the mud doesn't see a 'vacuum' condition. A steady pumping rate and a nice even stream of concrete coig out the hose goes a long way to controling lossof entrained air. rick5z: 07-27-2009

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Volume 19/Number 1 Control of Air Content in Concrete ...

air-entrained concrete. The test appara-tus determines the volume and size distributions of entrained air voids and thus allows an estimation of the spac-ing factor, the specific surface, and the total amount of entrained air. Fresh concrete samples can be taken at the ready mix plant and on site. Testing concrete before and after

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What Is An Air-Entraining Admixture Air Entrained ...

Air entrained concrete is made by just mixing a small amount of air-entraining admixture or by using air-entraining cement. These air-entrained agents in concrete generate millions of non-coalescing air bubbles, These air bubbles act as flexible ball bearings and will modify the properties of plastic concrete regarding workability, segregation, bleeding, and finishing quality of concrete.

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Concrete Pumping Effects on Air-Entrained Voids in ...

Unfortunately, the pumping of air -entrained concrete is known to affect the fresh air content in the fresh concrete. This has caused concern about the durability of concrete in environments where the concrete will experience repeated freezing and thawing cycles.

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Air entrainment and concrete - USDA

Air entrainment and concrete Some things every contractor should know about a combination that assures longer-lasting and more attractive concrete This photomicrograph of air entrained plastic concrete suggests how minute bubbles of air function as very small ball bearings which make the concrete

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Air Entrainment Report American Concrete Pumping Association

Air Entrainment Report. Safety Publications. Non-member price: $50.00. member price: $10.00. The compilation of a series of tests conducted to compare the air content, air void system parameters and freeze-thaw durability of air-entrained concrete as influenced

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CIP 21 Loss of Air Content in Pumped Concrete

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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Air Entrainment - Concrete Pumping

Aug 03, 2009  The Roughneck hose was made to reduse the air loss, by keeping the pipes full to the end of the tip hose, in otherwords, the mud doesn't see a 'vacuum' condition. A steady pumping rate and a nice even stream of concrete coig out the hose goes a long way to controling lossof entrained air. rick5z: 07-27-2009

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The effects of pumping on the air content and void ...

Dec 01, 2019  In particular, the effects of pumping air-entrained wet mix shotcrete on its air content and air void system are discussed, along with the possible ramifications of using different pump rates. 2 . Equipment, materials, and procedure

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Entrained Concrete - an overview ScienceDirect Topics

Tony Binns, in Advanced Concrete Technology, 2003. Air-entraining agents. The small air bubbles in air-entrained concrete behave like fine fines and can, accordingly, compensate for the lack of this size of material in coarse sand.The ability of air-entrainment to increase cohesion is well-established. Concrete that would normally be unpumpable due to low cohesion may be improved by the ...

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Air Entrainment Meters and Indicators - Humboldt Mfg

Air meters and indicators are used to determine the air content of fresh concrete at the point of placement. Because mixing, transporting, pumping and handling a mix can take out valuable air bubbles, the final air content of concrete must be tested at the right time and place. Therefore, mix evaluations throughout the settling process is ...

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Volume 19/Number 1 Control of Air Content in Concrete ...

air-entrained concrete. The test appara-tus determines the volume and size distributions of entrained air voids and thus allows an estimation of the spac-ing factor, the specific surface, and the total amount of entrained air. Fresh concrete samples can be taken at the ready mix plant and on site. Testing concrete before and after

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Air Entrainment Or Pump Cavitation? - Crane Engineering

Aug 06, 2015  Air entrainment and pump cavitation have similar symptoms. In a centrifugal pump, they both have the ability to produce a rumbling, rattling noise, and cause. above base line vibration. If left unchecked, each can cause the impeller to become pitted and damaged. Though the effects of entrained air and pump cavitation are remarkably similar ...

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Controlling Air Content in Concrete That is Being Pumped ...

Controlling Air Content in Concrete That is Being Pumped, A Synthesis Study Author: Charles F. Scholer and Jay Grossman Keywords: air content, air-entrained concrete, entrained air, pumping, air voids, SPR-2202 Created Date: 1/30/2012 10:14:47 PM

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How to Reduce or Eliminate Air Entrainment Pumps Systems

Dec 15, 2017  The bubbles may change in size but typically do not collapse when running through the pump. Air entrainment in very small amounts can actually be a good thing. Many users will inject up to 0.9 percent air to cushion the effects of cavitation. However, air entrainment even in amounts of 1 to 2 percent will cause pump performance to drop ...

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Some Recent Problems with Air-Entrained Concrete

Jul 01, 1989  Several problems are identified in regard to air-entrained concrete, which include the accuracy of the pressure air meter (ASTM C 231), the accumulation of air voids at the coarse aggregate surface, excessive loss of air volume in transit or in pumping, and the need for greater precision and detail in specification requirements for air-entrained concrete.

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ACPA, American Concrete Pumping Association New Safety ...

Mar 05, 2009  AMerican Concrete Pumping Association Safety Bulletin Contractors may sometimes require or request their concrete pumping company to use a double “S†shaped steel elbow, or other metal devices, when pouring concrete – Figure 1. The purpose of these devices is to prevent concrete from falling out of the boom pipeline by the force of gravity. Preventing the free fall of air ...

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