What should you do when pouring concrete in hot weather?

What should you do when pouring concrete in hot weather?

POURING CONCRETE IN HOT WEATHER

1. Dampen the substrate and form work with cool water prior to concrete placement.
2. Use cool mixing water to reduce initial concrete temperatures.
3. Store bags of QUIKRETE concrete mixes and aggregates in a shaded area.

What temperature is too hot for pouring 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.

Is it OK to pour concrete in the summer?

Experts agree that the ideal temperature for pouring concrete is approximately 50˚- 60˚ Fahrenheit. Since weather is unpredictable, and often uncooperative, we need to be flexible and prepared to pour in the hot weather.

How concreting is done during hot weather?

Hot weather conditions can produce a rapid rate of evaporation of moisture from the surface of the concrete and accelerate setting time etc. High temperature increases the hydration of cement resulting in faster setting which means the time available for workability (concrete in plastic state) of concrete is reduced.

Should you cover concrete in hot weather?

The concrete should be cured at the correct time with a suitable curing agent, which can be applied via a spayer. It is also advisable to cover the concrete over with plastic sheeting in order to shade the concrete from the harshest temperatures and lock in moisture.

Can it be too hot to lay 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.

Should you pour concrete in hot weather?

What temp 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.

Can you concrete in hot weather?

Avoid laying concrete at the hottest part of the day, between 11-3pm. Use a suitable concrete mix in your project. For example, set retarding concrete mixes slow down the curing process, making them ideal for use in hot weather. Keep all your equipment in the shade until you are ready to use it.

Which type of admixture should be used in hot weather concreting?

It is suggested, however, that under hot weather conditions, the combined use of class F fly ash and type D admixtures is to be recommended. Both retarders and fly ash were shown to increase the susceptibility of fresh concrete to plastic shrinkage cracking.

What is the maximum temperature for concrete?

95 °F
ACI 301-20 “Specifications for Concrete Construction” and ACI 305.1-14 “Specification for Hot Weather Concreting” limit the maximum concrete temperature to 95 °F (35 ºC) at the time of discharge. This limit is for general types of hot weather construction such as pavements, bridges, and buildings, not mass concrete.

Can it be too hot to lay slabs?

Avoid laying concrete at the hottest part of the day, between 11-3pm. For example, set retarding concrete mixes slow down the curing process, making them ideal for use in hot weather. Keep all your equipment in the shade until you are ready to use it.

How to avoid pouring concrete in hot weather?

1 Have sufficient manpower to manage the concrete when it is being poured and for the finishing process. 2 Use a large size and amount of coarse aggregate particles if hot weather is likely to occur during the concrete placement. 3 If possible, avoid placing concrete at noon or during the afternoon.

What’s the best temperature for concrete in the summer?

When the summer months get really hot, it can be a little too much of a good thing. In fact, concrete cures best in a range between 70° to 80° F. As your temperature approaches 90° F, however, you’ll start to run into problems. “Hot weather” is more than just temperature.

When is the best time to pour concrete?

During hot conditions, pours should be scheduled during the coolest part of the day. Most likely this time frame will fall in the morning hours. If your concrete is being mixed off-site and then delivered, make sure you avoid timing your deliveries during peak heat. Chilled water can reduce concrete temperature by up to 10° F.

What happens to concrete slab in hot weather?

Concrete sets much faster on hot weather days, making it very difficult to level and finish smoothly before it becomes set. Your finished slab is more likely to have surface deformities and unevenness unless precautions are taken.