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What is maximum allowable fresh concrete temperature until used as per ASTM?

There is no limit for temperature of fresh concrete as delivered in hot weather in ASTM C94. ACI 301 and ACI 305.1 state a maximum temperature of 95°F that can be modified by the project specification.

What are the required steps for collecting a sample of concrete from a stationary or revolving drum mixer?

What are the required steps for collecting a sample of concrete from a stationary or revolving drum mixer? Collect Two Or More Portions Of Concrete. Take The Portions At Regularly Spaced Intervals. Take The Portions From The Middle Of The Batch.

Why do we take temperature of concrete?

The temperature of the concrete affects the way it cures, and the final-strength gain. Hence, it is necessary to test the temperature of the concrete during its mixing and placing.

Why do we test temperature of concrete?

The hydration process can be drastically impacted if freshly placed concrete is exposed to temperatures that are too high or too low, compromising the strength development of a mix design. Furthermore, if the temperature differentials are too high, thermal cracking can occur.

How do you collect a concrete sample?

Fresh concrete samples can be collected from the mixer at the time of discharging or after concrete is discharged on site. While sampling from a mixer, then divide the batch into different parts and take sample increments form those parts. Avoid taking samples from the first and last part.

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What is the maximum temperature concrete can withstand?

The threshold of significant degradation of concrete is around 65-93°C (150-200°F). For this reason, current codes and industry standards dealing with reinforced concrete structures specify a maximum temperature limit of about 65-93°C (15O-2OO°F) to ensure predictable concrete behavior.

What is ASTM concrete temperature?

As per ASTM standards, the thermometer must be able to measure the temperature range of 30°F to 120°F. It must measure the temperature of concrete up to an accuracy of ±1°F. At what temperature does concrete freeze? The concrete mix poured at a temperature lower than 25°F might freeze during the process.

How to check the temperature of concrete?

1. Place the temperature measuring device in the freshly mixed concrete so that the temperature sensing portion is submerged a minimum of 3 in. 2. Gently press the concrete around the temperature measuring device at the surface of the concrete so that the ambient air temperature does not affect the reading.

How does one obtain a concrete sample from a batch in accordance with ASTM C172?

ASTM C172 Procedure No samples should be taken before 10% or after 90% of the batch has been discharged. To sample the concrete, pass the container through the discharge stream, or completely move the discharge stream into the sample container.

Why do we check the temperature of concrete?

By closely monitoring temperature variances in your concrete element during curing you will ensure that the strength, quality, and durability of your structure is acceptable. The heat produced by concrete during curing is called heat of hydration. This exothermic reaction occurs when water and cement react.

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What is maximum allowable fresh concrete temperature until used as per ASTM?

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