Table of Contents
When should you pour concrete?
Experts agree—the best temperature to pour concrete is between 40° – 60°F. When temperatures dip below 40°F, the chemical reactions that strengthen concrete slow down and can lead to weaker concrete.
Is it better to pour concrete at night?
Plan to pour concrete before 10 a.m. or after 8 p.m. in order to avoid the hottest part of the day. If you are concerned about the temperature while working on a summer project, consider pouring concrete at night to give the mixture the best chance to harden and cure before the sun comes up.
Can you pour concrete in the afternoon?
Avoid pouring concrete at noon, or during the afternoon when the sun is the strongest and the temperatures are the highest.
Is it OK to pour concrete in hot weather?
High summer temperatures, low humidity, direct sunlight, high concrete temperatures and even modest wind velocity can cause concrete surface cracking (plastic shrinkage cracks).
How late in year can you pour concrete?
While concrete can be poured at any time of year and in nearly any location, there is an ideal range of temperature in which to pour concrete, and if it’s too cold or too hot outside, you will need to account for that while using the material.
Can I pour concrete in the cold?
Never pour concrete over frozen ground, snow, or ice. Concrete in cold weather is recommended to have a low slump, and minimal water to cement ratio, to reduce bleeding and decreases setting time. Use concrete curing blankets to prevent freezing and keep the concrete at an optimal curing temperature.
Does concrete dry faster in heat or cold?
Concrete in cold weather absolutely does need to be cured—the surface can dry out even faster than in warm weather, if the concrete is warmer than the air. When finishing concrete in cold weather, you still need to wait for all the bleed water to evaporate.
What temp is too hot for concrete?
While most everyone enjoys the warm summer months, the temperature can make it difficult when pouring concrete in hot weather. Concrete cures best in a range between 70° to 80° F., but as your temperature approaches 90° F, you’ll start to run into problems.
At what temperature does concrete stop curing?
40 to 55 degrees Fahrenheit
Concrete retained in forms or covered with insulation seldom loses enough moisture at 40 to 55 degrees Fahrenheit) to impair curing.
How long should you monitor the temperature after installing mass concrete?
Every mass concrete project requires the contractor to monitor the temperature for several days after placement, sometimes even up to three weeks or longer. The temperature monitoring procedure that a contractor intends to follow usually must be described in a thermal control plan.
What is mass concrete and how is it defined?
Mass concrete is defined by the American Concrete Institute as: “any volume of concrete in which a combination of dimensions of the member being cast, the boundary conditions, the characteristics of the concrete mixture, and the ambient conditions can lead to undesirable thermal stresses, cracking, deleterious chemical reactions,…
What is the best way to maintain the durability of mass concrete?
Maintaining appropriate temperatures and temperature ranges within mass concrete is a key to maintaining its durability and longevity. Maintaining appropriate temperatures and temperature ranges within mass concrete is a key to maintaining its durability and longevity.
Where can I find articles on mass concrete?
CTLGroup offers expertise and a collection of articles on mass concrete. ACI Committee 207 examines mass concrete in detail.