hours limit after leaving in the plant pcd concrete

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Concrete Discharge Time Requirements - ASCC

Concrete,” and ASTM C94, “Specification for Ready-Mixed Concrete,” state time limits for the discharge of concrete. ASTM C94 states that dis-charge of the concrete shall be completed within 1-1/2 h after the introduction of the mixing water to the cement and aggregates or the introduction of the cement to the aggregates. This time limita-

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Maximum Allowable Time From Initial ... - Concrete Construction

I am involved with a large urban concrete project where concrete delivery is sometimes delayed by traffic congestion. The specification requires concrete placement within 90 minutes of batching at the plant. What is the significance of this 90-minute spec

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What is the Allowed Time for the Concrete Discharge?

Dec 08, 2017 · There is always confusion on site about the required time for the discharge of concrete. Some say it is 60 minutes, 90 minutes, 120 minutes, etc. Which is it? One time, we had cast the wall below ground. It was in the second basement, and due to the distance of the wall from the truck mixer outside the building, it took several minutes to reach the wall using the bobcat. The consultant found ...

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Time Limit Between Pours to Avoid Cold Joints| Concrete ...

We don't find any reference to a set time limit in the American Concrete Institute (ACI) building code or specifications for structural concrete. That's probably because time isn't the only factor to consider. In cool, damp weather you can wait longer to place the next batch than you can during hot, dry weather.

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Batching, Mixing, Transporting, and Handling Concrete, Chapter 10

produce the specified uniformity of concrete. All revolu-tions after 100 should be at a rate of rotation designated by the manufacturer as . agitating speed. Agitating speed is usu-ally about 2 to 6 rpm, and mixing speed is generally about 6 to 18 rpm. Mixing at high speeds for long periods of time, about 1 or more hours, can result in concrete

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