maximum time allowable from concrete batching plant to site

maximum time allowable from concrete batching plant to site

90 Minute Rule - Eng-Tips Engineering Forums

How is concrete mixed at a batching plant?

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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 or the allowed time for the concrete discharge. Some say it is 60 minutes, 90 minutes, 120 minutes, etc.

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Maximum Allowable Time From Initial Batching to Placement ...

Maximum Allowable Time From Initial Batching to Placement By Concrete Construction Staff Question: 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.

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Concrete Discharge Time Requirements - ASCC

This time limita- tion is permitted to be waived by the purchaser if the concrete is of such slump or slump flow after the 1-1/2 h time limit has been reached that it can be placed, without the addition of water, to the batch. This waiver is seldom used because the reasons for allowing the waiver are not well understood.

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90 Minute Rule - Concrete Engineering general discussion ...

The question I was really asking was if concrete is first mixed at the site, why does the 90 minutes (US guideline) actually begin from the time of batching at the plant. This is a requirement in New York State DOT specifications.

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Time limit between placing fresh concrete layers

BS 8500-2 requires concrete to be delivered "within 2 h after the time of loading where transported in truck mixers or agitators or within 1 h after the time of loading where non-agitating equipment is used, unless a shorter time is specified or a longer time permitted by the specifier. These limits are sufficient for normal UK temperatures."

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Mixing and Transporting Concrete

As a general rule of thumb, thirty to sixty minutes of transportation are acceptable on small jobs. At a central or portable ready-mix plant, concrete should be discharged from a truck mixer or agitator truck within two hours. If non-agitating transporting equipment is used, this time is reduced to one hour.

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How Long Can a Ready-mix Truck Wait?| Concrete Construction ...

Oct 27, 2010 · ASTM C-94, Specification for Ready-Mixed Concrete, does place a time requirement on delivered concrete. The document states that discharge of the concrete shall be completed within 1 ½ hours after the introduction of the mixing water to the cement and aggregates, or the introduction of the cement to the aggregates.

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How to build a concrete batching plant

2 days ago · When purchasing a concrete batching plant, the theoretical productivity of the concrete plant ought to be larger than we need. For example, if projects’ required amount of concrete is 70 cubic meters per hour, then we should choose hzs90 concrete plant with a theoretical productivity of 90m³/h, instead of hzs75 concrete plant with 75m³/h.

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2 hour transit time - Concrete Engineering general discussion ...

In the summer, that can be exceeded in under 90 min. necesitating proceedures such as using ice. Assuming the plant is a reputable plant, you will get your best quality concrete by batching the concrete at the plant and placinging it before it gets too hot. The truck should be able to dump in 10 min. if it is being pumped.

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