Know All About Accelerator Admixture for Concrete

March 19, 2020
Accelerator Admixture

Accelerator Admixtureincreases the rate of hydration of hydraulic cement, thereby shortening the set time and increasing the rate of resistance development or both. Accelerator admixture is added to concrete to increase the rate of initial resistance, reduce cure time, or both. The chemical composition of the accelerator includes inorganic compounds such as soluble chlorides, carbonates, silicates and fluorosilicates, and organic compounds such as triethanolamine. Using accelerator admixture for concrete offers you many benefits in your project.

Examples of Specific Accelerators

Calcium chloride is a common accelerator and is used to accelerate the setting time and rate of strength increase. Excessive amounts of calcium chloride in concrete mixtures can cause rapid hardening, increased drying shrinkage, and corrosion of reinforcements. Do not use calcium chloride as an antifreeze in cold weather. A large amount of calcium chloride is required to lower the freezing point of concrete.

Contractors can use accelerator admixtures for concrete whenever the curing process requires speed. Mixing allows concrete workers to delete shapes faster and reach and finish concrete surfaces faster. It can even load concrete surfaces faster, such as when diverting traffic for repairs. Suitable accelerators for reinforced concrete are:

Sodium thiocyanate and other thiocyanates

Triethanolamine and other alkanolamines

Products based on sulfate, nitrate, and formate

Benefits of Accelerator Admixture

The accelerator admixture for concrete can be used to increase the rate of cure or the rate of cure, or the rate of cure and initial strength increase of concrete, allowing for impact and demolding. Most accelerators perform one of these functions instead of both. Accelerators are more effective at lower temperatures. The use of admixture is rising very fast, as concrete admixture proposes physical and economic benefits. Admixture benefits concrete in the following possible ways:

1. accelerator admixture for concrete reduces cement requirements and makes concrete economical.

2. Enhance the workability of concrete.

3. accelerator admixture for concrete gives the concrete initial resistance.

4. accelerator admixture for concrete reduces the initial heat of hydration and overcome the problem of thermal cracks in concrete. If there is more heat of hydration, cracks can develop in the fresh concrete.

5. accelerator admixture for concrete improves the resistance of concrete to freezing and thawing.

6. accelerator admixture for concrete use waste to maximize sustainability.

7. Concrete admixture can shorten the hardening time, similar to the admixture that shortens the hardening time of concrete.

8. Some admixtures function as antibacterial agents.


Concrete with accelerators cures faster than comparable flat concrete. Curing time is typically 1-2 hours, but is affected by accelerator type, dose, and temperature. Accelerators can be used with superplasticizers, especially at low temperatures, when resistance is needed at an early age.

For more information about accelerator admixture or if you want accelerator admixture for concrete then get in touch with the team of Save Time Concrete. Discuss your requirement for concrete with a concrete expert along with getting a rate quote for the same.