Table of Contents
How long is concrete workable after mixing?
Do you have to send it back? Yes - According to ASTM C-94, concrete discharge must be complete within 90 minutes of mixing water with cement and aggregates.
How Long Can concrete be worked?
Under normal weather conditions, concrete can set in 8-48 hours, reaching 70% strength in approximately seven days. It then takes up to 28 days to fully cure and reach its full strength. Weather conditions have a profound effect on setting and curing.
How fast do you have to work concrete?
In standard industrial cases, full strength concrete is recognized at 28 days. At seven days, you should have concrete that is cured to 70% full strength or greater. But to answer the question of, “How long does concrete take to set?” concrete setting time is generally 24 to 48 hours.
Can we use concrete after 3 hours?
Concrete can last for 3 hours in ready mix truck. If it is not unloaded it on time the slump value of the concrete changes. Solidification of concrete takes long time so to the max only slump changes.
When should I start watering my concrete?
Properly curing your concrete improves strength, durability, water tightness, and resistance for many years. The first 7 days after installation you should spray the slab with water 5-10 times per day, or as often as possible. Once the concrete is poured the curing process begins immediately.
What is the final setting time of cement?
Detailed Solution
| Cement | Initial setting time | Final setting time |
|---|---|---|
| Ordinary Portland cement | 30 minute | 10 hours |
| Rapid hardening cement | 30 minute | 10 hours |
| High alumina cement | 3.5 hour | 5.5 hour |
| Low heat cement | 1 hour | 10 hours |