The temperature for adding early strength agent to concrete should not be lower than -5 ℃. When the daily temperature is within the range of 0 to 5 ℃, early strength agents can be employed, but insulation measures must be adopted. The specific temperature requirements should also be adjusted in accordance with the construction environment and the performance of the concrete.
1.Suitable temperature range
In concrete construction, the utilization of early strength agents can effectively enhance the early strength of concrete and shorten the setting time. Nevertheless, the application of early strength agents is not appropriate at all temperatures. According to the current standard “Technical Specification for Application of Concrete Admixtures” GB50119 in China, early strength agents can be used in environments where the daily temperature is no lower than -5 ℃. This is because at lower temperatures, the hardening and strengthening process of concrete will be influenced, and the addition of early strength agents can, to a certain extent, compensate for this effect.
2.Temperature adjustment and construction requirements
In actual construction, when the temperature is below -5 ℃, if early strength agent is still necessary, some special measures can be adopted to adjust the temperature. For instance, hot water can be utilized for concrete mixing to increase the temperature of the mixture. However, it should be noted that the water temperature should not exceed 65 ℃ to prevent adverse effects on the performance of concrete. Additionally, in extremely low temperatures, aggregates can be moved into a warm shed or other heating measures can be implemented to ensure the normal construction of concrete.
3.Selection and use of early strength agents
When choosing early strength agents, the selection should be based on the specific construction environment and the performance requirements of concrete. Different early strength agents have distinct characteristics and applicability, so caution should be exercised when making a choice. Meanwhile, the dosage of the early strength agent should also be determined through experiments to guarantee its optimal performance.
4.Temperature Control and Engineering Quality
Reasonably controlling the temperature during concrete construction is of crucial importance to ensuring the quality of the project. When adding early strength agents, more attention should be paid to temperature control. If the temperature is too low, it may cause the early strength agent to fail to fully exert its effect and even have a negative impact on the performance of concrete. Therefore, during the construction process, close attention should be paid to temperature changes and corresponding measures should be taken for adjustments.
In conclusion, the temperature for adding early strength agent to concrete should not be lower than -5 ℃, and it should be adjusted based on the specific construction environment and the properties of concrete. Reasonable selection of early strength agents and strict temperature control are key factors in guaranteeing the quality of concrete engineering.
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