Air and pumping of concrete Related Information

Major Problems in Concrete Pumping Works: How to Avoid

Major Problems in Concrete Pumping Works. 1. Blockage of Concrete Pump. Blockage can occur due to numerous bends in the pipeline, too sharp or too wide turns, gap-graded aggregate, and failure to clean and maintain the pipeline after each concreting work. High water-cement ratio and long waiting-time at construction site during which concrete

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

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.

AMERICAN CONCRETE PUMPING ASSOCIATION

Safety is a major concern of every person involved in the concrete pumping industry. It is vital to everyone involved with concrete pumping, from the concrete pump operator, to the ready mix driver, to the man on the end of the hose and to the construction contractor, that at all times they all must make safety a …

Testing Fresh Concrete at Point of Delivery

Air entrainment is helpful in moderate amounts, but too much air can make pumping very inefficient When flowing concrete is being pumped, an over-cohesive mixture with …

Volume 19/Number 1 Control of Air Content in Concrete

Control of Air Content in 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

Factors Which May Influence Air Content

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 boom.

Major Problems in Concrete Pumping Works: How to Avoid

Major Problems in Concrete Pumping Works. 1. Blockage of Concrete Pump. Blockage can occur due to numerous bends in the pipeline, too sharp or too wide turns, gap-graded aggregate, and failure to clean and maintain the pipeline after each concreting work. High water-cement ratio and long waiting-time at construction site during which concrete

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.

Volume 19/Number 1 Control of Air Content in Concrete

Control of Air Content in 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

Influence of Pumping/Extrusion on the Air-Void System of

T1 - Influence of Pumping/Extrusion on the Air-Void System of 3D Printed Concrete. AU - Das, Arnesh. AU - Song, Yu. AU - Mantellato, Sara. AU - Wangler, Timothy. AU - Flatt, Robert J. AU - Lange, David A. N1 - Funding Information: This research was supported by the NCCR Digital Fabrication, funded by the Swiss National Science Foundation.

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

Air void systems in pumped concrete

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 …

Effect of Air Entrained Concrete on Strength of Concrete

Normal reduction in strength of concrete by use of air-entrained admixtures varies from 3 to 7%. This variation of strength shall be considered in the mix design of concrete so that a desired compressive strength is achieved with required amount of admixture and workability. Suitably, trial mix designs should be done to find exact variation of strength with the use of this admixture and

Concrete Pumping

Mar 10, 2010 · Southwest Concrete Pumping Deven Colorado NEW VIDEO https://southwestcp.com or give us a call at 303-781-PUMP (7867) Southwest Concrete Pumping is a locally owned and operated company serving Colorado since 1990. Our main goal is to satisfy our customers on each and every pour. Our reputation in the industry explains our steady growth and success.

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.

Production and placement of self-compacting concrete

Jan 01, 2020 · SCC can be placed with chutes, buckets and pumps. Pumping is the most common method of SCC placement because of excellent flowability without segregation (Roussel et al., 2007).Fig. 3.3 shows the pumping of SCC from a truck using a crane pump at a building site in Melbourne, Australia. The diameter and total length of the pipelines, as well as the number of concrete pumps, need to be

Concrete pumping and its effect on the air void system

The air void system of each pumped concrete mixture was characterized before and after pumping, both in plastic and hardened states. Additionally, concrete pressure during pumping was monitored

Pumping of Concrete

These pumps are capable of pumping 130 m3 of concrete per hour with 8 inch pipes. Squeeze pumps or peristaltic pumps are the ones that use vacuum pumping. These pumps can cover a distance of 90 m horizontally and 30 m vertically, and are capable of pumping 20 m3 of concrete per hour using 3 inch pipes. (a) Direct acting piston pump.

Pumping of Concrete

CIP 21 - Loss of Air Content in Pumped Concrete WHAT is Air Loss in Pumping? WHAT is Air Loss? Increasingly, specifiers are testing concrete at the dis-charge end of concrete pumps and, in some cases, find-ing air contents much lower than that in samples tested at the truck chute. It is normal to find 0.5 to 1.0 per-cent less air at the pump discharge.