1) The appropriate dosage of high-efficiency water reducing agent is: air-entraining type such as methylnaphthalene series, condensed aromatic anthracene series, etc. The dosage is 0.5% to 1.0% of the cement dosage; non-air-entraining type such as melamine The dosage of resin-based and naphthalene-based water reducing agents can be selected between 0.3% and 5%, and the dosage is 0.7% and 1.0%. When used in prefabricated components that require steam curing technology, the dosage should be appropriately reduced.
2) High-efficiency water-reducing admixture is preferably incorporated into the solution, but the moisture in the solution should be deducted from the total water consumption.
3) The commonly recommended method is to add it together with the mixing water (add in the initial part of the mixing water later).
4) Compound high-efficiency superplasticizers have different ingredients and many brands. Whether they are suitable for use must be tested first. High-efficiency superplasticizers also have adaptability problems to cement due to differences in cement type, fineness, and mineral composition. It is recommended to test before selection.
5) Except for sulfamic acid and graft copolymers, the slump loss of concrete is very large. It can lose 30% to 50% in 30 minutes. Pay attention to it during use. . </p
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