Test Concrete Slump at Point of Discharge or Point of

May 16, 2014 · The slump, air content, and temperature of the concrete can change during pumping. Therefore, concrete producers may need to deliver concrete that is out of specification (slump and air too high, for example) so that it will meet the specification after pumping. The concrete producer would generally prefer to test at the point of discharge.

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Influence of Pumping on Characteristics of Air-Void System

effect of pumping on the characteristics of the air-void system. Field experience indicates that pumping often reduces the total air content in air-entrained concrete (1-4), which can possibly have a detrimental influence on the frost resistance. The air loss is generally small (i.e~, 1 to 2 percent, but it can also be significant (i.e., greater

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Concrete pumping and its effect on the air void system

Jul 05, 2018 · Up to10%cash back · The particular effect of pumping on changes in the concrete air void system has been investigated in the past [5,6,7,8,9,10]. The general belief within the North American concrete industry is that pumping reduces air content by two or three percent . However, numerous studies have shown that the behavior of the air void system is not easily predicted and pumping can increase, decrease, or have no effect on the air content or the air void system (in terms of air void …

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Air entrainment and its effects in concrete • Aggregate

Jul 12, 2010 · Uses and effects of air entrainment. Air entrainment is the process where many small air bubbles are distibuted into concrete and become part of the matrix that binds the aggregate together in the hardened concrete. These air bubbles are dispersed throughout the hardened cement paste but are not, by definition, part of the paste (Dolch 1984).

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CIP 21 - Loss of Air Content in Pumped Concrete

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," Master's Thesis, Department of Civil Engineering, University of Wash-ington, Seattle, Washington

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MAN concrete mixer trucks for sale at Truck1

Concrete mixer truck MAN TGS 26.360BB*7m³ Karrena*Klima*Manuell*AP Achsen, 2009. MAN TGS 33.400 6X4. Concrete mixer truck MAN TGS 33.400 6X4 MANUAL, 2009. MAN 26.281 6x4. 1983 . Germany, München 8 800 EUR. Concrete mixer truck MAN 26.281 6x4, 1983 10. 21 900 EUR. Netto price. MAN TGA 26.360 BB - STETTER 7m3. 2005 337 936 km Net weight:

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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 indicator of the air void system in the hardened concrete. How to Avoid Air Loss?

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Volume 19/Number 1 Control of Air Content in Concrete

Concrete Air-Void Analyzer Figure 1. Freeze-thaw deterioration of non-air-entrained concrete railing. (S44517) Control of Air Content in Concrete New manual provides concrete producers and users with tips on achieving and controlling air in concrete. Air entrainment is a necessary com-ponent of concrete mixtures exposed to freezing and thawing

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Air Entrainment Meters and Indicators - Humboldt Mfg

Chace Concrete Air Indicator. For quick field checks for air content of fresh concrete in about three minutes. H-2785.DB Super Pump for Air Meters. The Super Pump's all brass construction resists acids in cement. H-2782 Air Entrainment Meter, 8L. The H-2782 8 Liter air meter features push-buttons for simple test performance. H-2781 Air

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Investigating Effects of Concrete Handling on Air Content

Sep 01, 1995 · A 1994 study examined the effects of concrete handling methods on normal air-entrained concrete. Concrete for a large parking lot and driveway project was placed by pump, crane and bucket, truck-mounted conveyer, and directly from the chutes of ready mix trucks. The primary goal of the test program was to determine how air content, air-void system parameters, and freeze-thaw durability of air

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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 by …

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

Testing concrete as discharged from the pump alongside the pump will require the most critical boom configuration that will cause the highest loss of air content. If concrete at a higher air content (to compensate for this loss) is placed at a less critical, more horizontal boom configuration, the concrete placed in the structure will be at a high air content and lower strength.

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Concrete Air Testing: An In-Depth Look - Gilson Co.

Air Content in Concrete Mix Design. The primary purpose of entraining air in concrete is to increase its durability when exposed to freeze/thaw cycles with water present. Air-entraining admixtures for concrete create small, uniform, and stable air bubbles from around 0.01mm to 1mm diameter in the cement matrix throughout a concrete mix.

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Air and pumping of concrete - Concrete Engineering general

Aug 16, 2011 · If the mix design has air entrainment in it, it is common for field QC agents for the concrete company will add air on-site for pumped mixes to account for air loss due to damage of the air bubbles in the pumping process. also there can be air content loss if a porous aggregate (for lightweight concrete) is used that was not properly saturated and the pumping process causes a slump loss.

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MAN TGS 33.360 6X4 Tipper Truck - BAS Trucks

MAN TGS 33.360 is for sale at BAS Trucks. View our complete offering of more than 1.500 new and used trucks.

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Concrete mixer truck for sale, used concrete mixer truck

Concrete mixer trucks: 883 offers, search and find ads for new and used concrete mixer trucks for sale, mixer truck, cement mixer truck, concrete truck — Machineryline Malaysia TGS 18.360 TGS 26.400 TGS 32.360 TGS 32.400 TGS 32.420 TGS 32.430 TGS 33.360 TGS 33.400 TGS 33.430 TGS 35.430 TGS 35.440 TGS 41.360 TGS 41.400 TGS 41.420 TGS 41

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Influence of Curing Conditions on Concrete Specimens

materials (w/cm) ratio of 0.41, a type A water reducer, and an air entraining agent. The measured air content was 7.0 and 7.5 percent, respectively. The initial concrete temperature was 71°F. Cold Weather Curing Methods A total of 33 4x8 inch cylinders were cast for …

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Test Concrete Slump at Point of Discharge or Point of

May 16, 2014 · The slump, air content, and temperature of the concrete can change during pumping. Therefore, concrete producers may need to deliver concrete that is out of specification (slump and air too high, for example) so that it will meet the specification after pumping. The concrete producer would generally prefer to test at the point of discharge.

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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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