What is the effect of pumping on air entrained concrete Related Information

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.

Entrained Air In - labourtaber.com

• Above 20 percent entrained air: A self-priming pump is typically specified when entrained-air levels rise above 20 percent. How to Determine Your Entrained-Air The first step in determining your process liquid's percentage of entrained air is to assess all the potential air …

The effects of pumping on the air content and void

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.

CCRT ASICS - Illinois Ready Mixed Concrete Association

"Entrained air" is purposely put into the concrete by the addition of an air entraining agent, AEA. These bubbles are microscopic in size and more stable than entrapped air. Although, slump, mixing time, concrete temperature, pumping, vibration, and the physical and chemical characteristics of all mix ingredients, can have an altering

Air-entraining admixtures - Concrete

The benefits of entraining air in the concrete include increased resistance to freeze-thaw degradation, increased cohesion (resulting in less bleed and segregation) and improved compaction in low-workability mixes. The volume of air entrained depends on the application and the mix design. After mixing, air can be lost during transport and pumping.

BSA Trailer Pumps - Concrete Equipment Inc

BSA Trailer Pumps BSA 14000 HP-D • High-rise concrete pumping • Long-distance concrete pumping • Tunnel construction BSA Trailer Pumps High Performance. High Pressure. Powerful Performance Across Multiple Applications Featuring convenience, power and durability, Putzmeister's

Concrete pump BSA 14000 HP - CAELLI

Concrete pump BSA 14000 HP Output up to 200 m3/h Delivery pressure up to 260 bar Note: Standard version. Dimensions and weights depend on equipment. Performance diagram Technical data for concrete pump Model Material number BSA 14000 HP -D 100807.006 14000 HP -D 100808.005 14000 HP -E 100809.004 14000 HP -D 100870.004 Output m³/h 82/54* 102/70

BSA Series (Trailer Pumps) > KING Shotcrete Solutions

Only Putzmesiter has the technology to provide both high output and high pressure in one pump. Putzmeister's extended BSA Series of Trailer Pumps ranges from the BSA 100 to BSA 14000, and facilitates pumping for a wide variety of applications. The BSA Series is ideal for high-rise and long-distance concrete pumping, tunnel construction, sludge pumping and other specialty jobs.

Factors Affecting Pumping of Concrete - Civil Bull

Jul 18, 2021 · However, many of the admixtures will affect pumping as described below. Air-entraining Admixture. Air-entraining admixture incorporates many tiny air bubbles in concrete. The air bubbles increase pumping because of improved plasticity, less bleeding and …

Entrained Air - an overview | ScienceDirect Topics

Peter A. Claisse, in Civil Engineering Materials, 2016 21.5 Mix design for air-entrained concrete 21.5.1 Effect of air entrainers. Air entrained mixes are produced with the addition of an air entraining admixture, and are normally used to prevent freeze–thaw damage.

Factors Which May Influence Air Content - RussTech

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. Finishing – If concrete surfaces are excessively finished air content at the

Placing, Consolidating and Pumping Air Entrained Concrete

There is a lot of confusion surrounding placing, pumping, and vibrating air entrained concrete. This seminar, presented by one of the industry's leading experts, will dispel those myths and get to the facts to take advantage of effective placing methods. Understand all the factors such as the concrete mixture itself, types of admixtures, slump, combined aggregate grading, pumping rate and

CONCRETE PUMPING EFFECTS ON ENTRAINED AIR-VOIDS. FINAL REPORT

CONCRETE PUMPING EFFECTS ON ENTRAINED AIR-VOIDS. FINAL REPORT. 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.

Entrained Air - an overview | ScienceDirect Topics

Peter A. Claisse, in Civil Engineering Materials, 2016 21.5 Mix design for air-entrained concrete 21.5.1 Effect of air entrainers. Air entrained mixes are produced with the addition of an air entraining admixture, and are normally used to prevent freeze–thaw damage.

Concrete Pumping Effects on Entrained Air-Voids

Air entrainment and its effects in concrete • Aggregate

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 concrete is pump. •Pumping effects: •Slump •Segregation •Air. Pumping Changes The Concrete 5" Slump Before the Pump After the Pump 2" Slump.

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.

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

Examination of Air Entrainment Stability Factors of Pumped

Nature of AEA Film Around the Entrained Air Void [22] . Interactions Between Cement, Air, Water and Molecules of Air Entraining Agent [17] Apparatus Used in the Linear Traverse Method [19] . Effect of Entrained Air Content on the 28-Day Compressive Strength of Concrete [22] . . . . . .

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