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Investigation of Concrete Pumping Effects on Air-Entrained

Pumping Air Entrained Concrete

Discussion of Fresh Concrete. •After one cycle: Air content decreased SAM Number shows loss of small bubbles when you pump. •Air void system in the fresh concrete changed due to pumping with these materials and equipment.

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Loss of Air Content in Pumped Concrete — What, why, & …

12/7/2010 · Excessive fines, minus No. 100 material, causes a reduction in air entrainment. Because the use of chemical and mineral admixtures in addition to air-entraining agents has become common practice, concrete users are always concerned about the effects of these admixtures on the air-void system and durability of concrete.

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Examination of Air Entrainment Stability Factors of Pumped Concrete

IMPLEMENTATION STATEMENT This report summarizes the findings pertaining to the effects of various factors on the pumping of air-entrained Portland Cement Concrete and the circumstances surrounding the loss of air that can occur during the

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Concrete Pumping Effects on Entrained Air-Voids

Title. 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 …

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Effect of Air Entrained Concrete on Strength of Concrete

It is claimed that, the place-ability of an air entrained concrete having 7.5 cm slump is better than a non-air entrained concrete with a slump of 12.5 cm. By and large, the compressive strength of concrete is reduced by use of air entrained admixture, as shown in Fig. 1.

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Air entrainment in fresh concrete and its effects on …

Effects of air entrainment on properties of concrete at fresh and hardened states are reviewed. Abstract The presence of the stable and adequate air-void system in fresh and hardened concretes are crucial to many properties, such as resistance against freeze and thaw cycle, workability/rheology, pumpability, strength, and fire resistance of concrete.

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Research - Concrete Pumping Effects on Entrained Air …

2/7/1994 · 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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Impact of Concrete Placing Method on Air Content, Air …

1/1/1996 · Concrete Pumping Effects on Entrained Air Voids. Final Report, Research Project T9233 Task 21, for the Washington State Transportation Commission, Washington State Transportation Center, University of Washington, Seattle, June 1994, 97 pp.

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Adjusting Air Entrainment| Concrete Construction Magazine

17/2/2009 · When air entrainment is added to concrete, there is some effect on slump, and compressive strength is reduced by about 500 psi in a standard 6-bag (564-pound) mix. There are two kinds of air in concrete: entrapped and entrained. Entrapped air is a result of the mixing process. As concrete is being mixed about 1.5% air becomes entrapped.

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Concrete pumping and its effect on the air void system | …

Air entrainment and its effects in concrete • Aggregate Research

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Pumping Air Entrained Concrete

•Air Content and SAM testing after pumping may not be representative of the hardened concrete. •If this is true then concrete should not be rejected for low air or high SAM Number after pumping. •It appears that sampling the concrete prior to pumping is a good

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Adjusting Air Entrainment| Concrete Construction Magazine

17/2/2009 · When air entrainment is added to concrete, there is some effect on slump, and compressive strength is reduced by about 500 psi in a standard 6-bag (564-pound) mix. There are two kinds of air in concrete: entrapped and entrained. Entrapped air is a result of the mixing process. As concrete is being mixed about 1.5% air becomes entrapped.

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Air and pumping of concrete - Concrete Engineering …

16/8/2011 · 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 - …

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Factors Affecting Air Entrainment - GCPAT

Concrete Mixer • The amount of air entrained by any given mixer (stationary, paving, transit) will decrease as the blades become worn. • Air content will increase if the mixer is loaded to less than capacity and will decrease if the mixer is overloaded.

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Air entrainment and its effects in concrete • Aggregate …

Air entrainment and its effects in concrete • Aggregate Research

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Air Entrainment Or Pump Cavitation? - Crane Engineering

6/8/2015 · 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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Effects of Synthetic Air Entraining Agents on Compressive Strength of Portland Cement Concrete …

Effects of Synthetic Air Entraining Agents on Compressive Strength of Portland Cement Concrete - Mechanism of Interaction and Remediation Strategy FINAL REPORT JULY 2002 Submitted by Zhijun Zhang *Farhad Ansari * Ph.D Candidate * Dept. of Civil

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Air and pumping of concrete - Concrete Engineering …

16/8/2011 · 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 - …

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Air Content Loss in Pump | CZBY CONCRETE PUMP PARTS

26/5/2015 · "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

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Appendices: Concrete Pumping Effects on Entrained Air-Voids

Appendices: 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. concrete pumping,

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