Polycarboxylate superplasticizer is composed of water-reducing retarders, plasticizers, air-entraining agents, and other components. It features air-entraining enhancement, reduced early hydration heat, and delayed slump loss in concrete. It exhibits strong adaptability to various cement types and is non-corrosive to steel reinforcement. The usage methods and precautions for polycarboxylate superplasticizer are as follows:
When using polycarboxylate superplasticizer or replacing cement, trial mixing is required to determine the dosage, and it can only be used after meeting the user's requirements. During application, it can be directly mixed with the concrete mixture by extending the mixing time by one minute. If conditions permit, the "post-mixing method" yields better results. Liquid products can be directly mixed with concrete in water, but accurate measurement must be ensured.
R1: "Gel" must be translated as "gel"
The dosage of delayed carboxylic acid water-reducing admixture should be strictly controlled in both testing and actual production. An insufficient dosage will fail to achieve the intended delayed water-reducing effect, while an excessive dosage may cause excessive delay in concrete setting or severe bleeding and segregation. It exhibits good compatibility with various types of cement and admixtures, addressing the compatibility issues of other polycarboxylate water-reducing admixtures with gel materials, resulting in favorable economic benefits.
The concrete admixture exhibits excellent durability, surpassing conventional polycarboxylate superplasticizers in terms of filling, stability, pumpability, compactness, sulfate corrosion resistance, alkali-aggregate reaction resistance, freeze-thaw resistance, shrinkage, and creep performance. With low dosage and high water reduction rate, when the dosage is around 1.0%, the water reduction rate can exceed 35%. The product demonstrates good stability and does not precipitate under low-temperature conditions. Concrete prepared with this high-performance polycarboxylate superplasticizer shows no significant segregation or bleeding even at high slump, while maintaining uniform color appearance.
The alkali content, chloride ion content, sodium sulfate content, and formaldehyde content of polycarboxylate superplasticizer are all very low, and the production process will not cause pollution to the natural environment, which is conducive to sustainable development. This polycarboxylate superplasticizer has a low dosage range, and its strength increases with the increase of dosage, but when it exceeds the optimal dosage, the strength does not further increase.
