When is a concrete truck considered too old to pour? Do you have to send it back? The answer is yes and no…. Yes – according to astm c-94, concrete discharge must be complete within 90 minutes of mixing water with cement and aggregates.
How Long Will Concrete Stay Workable?
Concrete is one of the most widely used materials in construction and is renowned for its durability and strength. However, when working with concrete, it is important to understand how long it will remain workable.
In other words, how long will it stay in its plastic state before it begins to harden? Knowing this information is important for achieving the best possible results with any concrete project.
The workability of concrete will depend on various factors, including the temperature, the weather, and the type of cement used. Generally, concrete will remain workable for a period of two to three hours.
This is known as the “working time” and during this time, the concrete can be poured, leveled, and molded as needed. After this period, the concrete will begin to harden and will no longer be workable. The temperature of the concrete itself can also affect how long it will remain workable.
On a hot day, the concrete can dry out much faster, so it is important to work quickly when temperatures are high. Conversely, on a cold day, the concrete may take longer to set and can remain workable for up to four hours.
In addition to the temperature, the weather can also affect the working time of
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