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https://www.qualityengineersguide.com/what-is-the-allowed-time-for-the-concrete-discharge
Well in my experience as a QA/QC engineer I have read several standard on concrete.one of the most like standard is Australian standard of opc concrete expiring time.it indicates if the temprature of concrete is between 32c -35c then the elapsing time will be 45minute only.and if it is 32c then it will me 90minute and if it is between 28c -23c then it will …
https://www.concreteconstruction.net/how-to/maximum-concrete-temperature_o
As soon as the concrete begins to cool, the gradient, which depends strongly upon external temperature, will determine the cracking risk of that concrete. During this phase (from 24 to 72 hours after pouring), if the concrete is able to generate tensile stresses higher than the tensile strength, a crack will appear.
https://www.concreteconstruction.net/how-to/time-limit-between-pours-to-avoid-cold-joints_o
A.: 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.
https://betonabq.org/wp-content/uploads/2017/09/aBest_Practices_Guide_.pdf
the cooling or heating of concrete, limits on the hours of work, etc. ... Identifying maximum placement rates of concrete ... Best Practices Guidelines for Concrete Construction 7. 8 Best Practices Guidelines for Concrete Construction Chapter 2 …
https://www1.nyc.gov/assets/buildings/pdf/concrete_and_formwork_in_NYC.pdf
BC 1704.4 Concrete construction. Testing of Concrete Construction at the time fresh concrete is required at all times except in the following cases: Where total concrete placement on a given project is less than 50 cubic yards Isolated spread footings of 1 or 2 family buildings three stories or less supported on earth or rock
http://www.concrete.org.uk/fingertips-nuggets.asp?cmd=display&id=1030
Fresh concrete shall not be placed against in situ concrete that has been in position for more than 30 minutes unless a construction joint is formed..... BS 8500-1 Concrete – Complementary British Standard to BS EN 206, clause A.9.1 takes a more flexible approach in stating:
https://www.engr.psu.edu/ce/courses/ce584/concrete/library/construction/mixingtransport/mixingandtransporting.html
concrete, a longer mixing time is required. 3.0 Transporting Concrete. Transporting the concrete mix is defined as the transferring of concrete from the mixing plant to the construction site. Keep in mind that not all concrete is mixed on the actual construction site and could require some significant travel.
https://datcp.wi.gov/Documents/CDSChapter5.pdf
1. Specifying the proper concrete mix. 2. Specifying the correct design details. 3. Following correct construction practices to place the concrete. Chapter 4 describes the specifications for conc rete materials used in the mix. The following discussion describes the concrete structure design and important details of construction. Correct
https://www.forconstructionpros.com/concrete/equipment-products/article/11598829/how-to-plan-and-manage-curing-for-mass-concrete-pours
1) The maximum temperature in concrete after placement shall not exceed 158 degrees Fahrenheit. 2) The maximum temperature difference between center and surface of placement shall not exceed 35 ...
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