Temperature:
The setting time of concrete is closely related to temperature changes. As temperature rises, the setting process accelerates, and the timing for secondary vibration should be advanced accordingly. Conversely, lower temperatures delay setting, requiring later vibration. Additionally, daily temperature fluctuations should be considered, and vibration timing adjusted as needed.
Cement Type:
The type of cement used affects setting time. Cement with added mixed materials (e.g., slag cement) generally has a longer setting time compared to pure Portland cement. For example, slag cement sets more slowly than ordinary Portland cement.
Concrete Strength Grade:
Under the same conditions, higher-strength concrete tends to have a shorter setting time.
Slump:
In general, setting time increases slightly with higher slump values. However, during high-temperature seasons, the influence of slump on setting time becomes negligible.
Water-Cement Ratio:
Secondary vibration is more effective in enhancing the strength of concrete with a low water-cement ratio. For concrete with a high water-cement ratio, the improvement from secondary vibration is less significant.

Precautions for Concrete Vibration