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Concrete accelerators are chemical additives used in construction to speed up the setting time of concrete. These products are typically composed of calcium chloride or other proprietary blends that enhance the hydration process of cement. By reducing the time needed for concrete to reach its initial set and gain strength, accelerators are essential for projects requiring quick turnaround times, especially in cold weather conditions.
| Chemical composition | Calcium chloride or non-chloride alternatives |
| Typical dosage | 1% to 2% by weight of cement |
| Effect on setting time | Reduces initial set time by 30% to 50% |
| Compatibility | Compatible with most types of Portland cement |
| Temperature range | Effective in temperatures as low as -5°C (23°F) |
When selecting a concrete accelerator, consider the specific project requirements such as ambient temperature and desired setting time. It's important to specify the type of accelerator (chloride or non-chloride), the dosage based on the weight of cement, and any compatibility with other admixtures being used. Additionally, inquire about certifications and compliance with relevant standards to ensure quality and performance. Quantities should reflect the scale of your project to avoid excess or shortage.
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To speed up the setting time and strength gain of concrete.
They are primarily designed for cold weather applications but can be used in hot weather with caution.
Yes, there are non-chloride options that are suitable for use in reinforced concrete.
Lower temperatures may require higher dosages to achieve desired setting times.
If used correctly, they can enhance early strength without compromising long-term performance.
Typically, 1% to 2% of the weight of cement is recommended.