In the best of circumstances good concrete placement can be a huge challenge, throw in a hot weather day then you are in for an interesting experience. Just like high temperature can affect human beings, high temperatures can also negatively affect concrete curing, strength and durability. How does hot weather affect concrete? What should you do to mitigate the effect of hot weather on your concrete?
ACI 305 provides detailed and vital information on the subject of hot weather concreting. ACI 305 defines hot weather as “any combination of the following conditions that tends to impair the quality of freshly mixed concrete or hardened concrete by accelerating the rate of moisture loss and the rate of cement hydration or otherwise causing detrimental results.
Below are few tips based on years of research by Schomburg Chemical group, Germany and America Concrete Institute (ACI) recommendations for Hot weather concreting.
Impacts of Hot weather on Concreting are as follows:
- Setting time
In hot weather, the setting time of concrete can be highly accelerated, leading to increased rate of cement hydration and evaporation of the freshly placed concrete. This can increase the incidence of crack, reduce strength and reduced workability of concrete.
- Compressive Strength
When hot weather accelerate setting time, this usually affects the workability of concrete, More often than not, this may result inadding more water to the concrete to increase workability which cause problems such as bleeding and affecting the overall strength of the concrete at 28 days.
- Increased Slump Loss
Because Hot weather reduce the length of time during which fresh concrete remains workable ,this usually result in accelerated slump loss. Other challenges of hot weather concrete are shrinkage cracks, moisture loss etc.
How can you reduce the impact of hot weather on your concrete?
Thankfully, Schomburg offers a wide range of primary admixtures such as Aquafin AQ100P, retarders and new generation of polycarboxylic plasticizers such as Remicrete 56 and Remicrete SP10. These admixtures will do the following for your concrete:
- Control the setting time of concrete
- Help to reduce slump loss
- Compensate for loss in compressive strength
- Reduces concrete shrinkage and cracking in all temperature conditions
Schomburg offers a wide array of Primary waterproofing admixtures series with hydrostatic capacities, general concrete admixtures series such as retarders, plasticizers, PAE and PCE super plasticizers with high range water reducing capabilities.
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If you will like us to conduct seminar or training for your organization on “Hot Weather concreting” or you will like to study the full ACI specification document on hot weather concreting, Please contact us through our email or phone number and we will get back to you within the hour.