Question

Under the normal weather conditions, how much strength does concrete gain in the first 7 days?

1) 20%
2) 40%
3) 60%
4) 80%

Answer 1

Under normal weather conditions, concrete typically gains around 60% of its ultimate strength in the first 7 days.

Step-by-step explanation:

Under normal weather conditions, the strength of concrete typically increases significantly in the first 7 days. During this time, the concrete gains around 60% of its ultimate strength.

Under normal weather conditions, concrete typically gains about 60% of its full strength within the first 7 days.

Under normal weather conditions, concrete gains a significant amount of its strength within the first 7 days of curing. Typically, concrete is expected to reach about 60% of its full strength during this initial period. The rate at which concrete gains strength can vary based on factors such as temperature, humidity, and the specific mix of the concrete, but the general rule of thumb is that it will achieve roughly 60% strength at the end of one week under normal curing conditions. This information is particularly important for construction timelines.

For example, if the ultimate compressive strength of the concrete is 5000 pounds per square inch (psi), it would gain around 3000 psi in the first 7 days.

This increase in strength is due to the hydration process, where the cement particles react with water and form chemical bonds, solidifying and strengthening the concrete over time.