As the latest generation of cement dispersants, what are the characteristics of early-strength water-reducing agents? There is no doubt that the water-reducing rate of water-reducing agents is high. Many industries have such a concept. The impact of slump on Water consumption is highly sensitive, so it must be measured accurately when used. Strict control of water consumption is the unanimous feeling of many people in the industry. Due to its high water reduction rate, good slump retention ability, and good adaptability to cement, etc. Characteristics, it can significantly improve the workability of cement-based mixture materials, increase early and late strength, and improve the durability of concrete.
Sensitivity performance of early-strength water-reducing agents
During the use of early-strength water-reducing agents by admixture synthesis companies, technical service personnel and customers often report that the water-reducing agents are relatively Sensitivity, its sensitivity is mainly manifested in:
1. Dosage sensitivity
If the dosage of early-strength water-reducing agent in concrete fluctuates slightly, the cement mixture will easily segregate. , bleeding or failure to open, which has a negative impact on the pumping performance, mechanical properties and durability.
2. Temperature sensitivity
When the temperature difference between morning and evening is large, the fluidity of concrete fluctuates greatly. When the ambient temperature is high in summer, the fluidity loss of the mixture is large; when the ambient temperature is low in summer, the fluidity of the mixture becomes larger over time, leading to problems such as cement delamination, stone sinking, poor wrapping, and poor appearance.
3. Sensitivity to water consumption
Because early-strength water-reducing agents are higher than naphthalene-based and aliphatic water-reducing agents and have high dispersion, the water-reducing rate reaches Above 30%, as the dosage increases, the sensitivity to water consumption per side becomes more prominent, and the mixture may appear to be layered, segregated, or bleeding. In the actual production process of the mixing station, the moisture content of the sand and gravel often fluctuates. If the moisture content of the sand and gravel is not estimated accurately, the actual amount of water mixed into the cement product will change. The water-reducing agent will During application, there are problems that are more sensitive to water consumption and cannot meet construction requirements.
4. Sensitivity to raw materials
Sensitivity to sand, cement, and admixtures is mainly manifested in the fact that when the mud content of sand and gravel increases, the early-strength water-reducing agent The dosage also increases; when the type, brand or batch of cement or admixture is changed, the fluidity of the mixture will also change significantly.
The characteristics of early-strength water-reducing admixture are now very clear. Only then will we have a more comprehensive grasp of various processes such as production synthesis or compounding.
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