Question

How do higher temperatures at time of placement affect concrete?

1) Concrete has a lower slump
2) Concrete has a higher slump
3) Concrete is easier to work with
4) Concrete is more liquid

Answer 1

Higher temperatures at the time of concrete placement typically cause a higher slump, making the concrete initially more fluid, but can lead to issues with rapid setting, reduced strength, and cracking if not properly managed.

Step-by-step explanation:

When higher temperatures are experienced at the time of concrete placement, it can have multiple effects. In general, concrete may experience a higher slump due to increased temperatures, meaning it becomes more fluid and may seem easier to work with initially. However, this can also lead to quicker water loss and potential issues with the concrete setting too rapidly, which may lead to problems such as reduced strength and cracking.

A higher temperature can decrease the setting time of concrete, making it more critical to work quickly and efficiently. It is important to control the temperature of concrete during curing to ensure optimal strength and durability. Specific methods to help manage the temperature include using cold mixing water, shading the concrete, applying curing compounds, and scheduling pours during cooler times of the day.