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https://www.ascconline.org/Portals/0/docs/POSITION-STATEMENTS/PS-32-concrete-discharge-time-requirements.pdf
Concrete Discharge Time Requirements ASCC Position Statement #32 Project specifications, including those that cite ACI 301, “Specifications for Structural 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 ...File Size: 243KB
https://www.qualityengineersguide.com/what-is-the-allowed-time-for-the-concrete-discharge
Dec 08, 2017 · However, by the introduction of admixtures either mineral or chemical admix the quality of concrete will be inhanced and setting time property will be prolonged, so the 1 1/2hr required time in no longer applicable.. You can establish the maximum time for …
https://www.concreteconstruction.net/concrete-production-precast/its-about-time_o
Most states limit concrete delivery to 60 minutes from the time water hits the cement to the time of discharge. ASTM C94, “Standard Specification for Ready-Mixed Concrete,” allows for 90 minutes until discharge. These are relatively safe time frames considering the impact on the quality of the concrete.
https://www.nrmca.org/aboutconcrete/howdelivered.asp
Generally, ready mixed concrete producers, load their trucks with a quantity at or near the rated mixer capacity. Fresh concrete is a perishable product that may undergo slump loss depending on temperature, time to the delivery point on the job site, and other factors.
https://www.concreteconstruction.net/concrete-production-precast/how-long-can-a-ready-mix-truck-wait_o
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.
https://theconstructor.org/concrete/effect-of-transit-time-on-ready-mix-concrete/8754/
EFFECT OF TRANSIT TIME ON READY MIX CONCRETE. Ready mix concrete is generally produced in large quantity and is transported to distant places for placement in structural elements. Sometimes the distance can be in many kilometers or miles. So, the effect of this transit times can reduce the quality of concrete. ... Time period for delivery of ...
http://www.concrete.org.uk/fingertips-nuggets.asp?cmd=display&id=1030
Where required, the specification of a maximum time between placing layers of concrete should take account of the likely temperature of the concrete, cement type, mix proportions, the use of admixtures with set retarding properties and consistence of the concrete.
https://www.concrete.org/tools/frequentlyaskedquestions.aspx?faqid=15
A. ACI 301-16 “Specifications for Structural Concrete” and ACI 305.1-14 “Specification for Hot Weather Concreting” limit the maximum concrete temperature to 95 °F (35 ºC) at the time of discharge. This limit is for general types of hot weather construction such as …
https://scetcivil.weebly.com/uploads/5/3/9/5/5395830/batching_mixing_transporting_handling_concrete.pdf
Batching, Mixing, Transporting, and Handling Concrete. Fig. 10-3. Central mixing in a stationary mixer of the tilting drum type with delivery by a truck mixer operating at agitating speed. (69926) Fig 10-4. (top) Nonagitating trucks are used with central-mix batch plants where short hauls and quick concrete
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