Main properties of powder polycarboxylic acid superplasticizer
1. Apparent performance index
After the low dosage of cement has a good dispersion and liquidity;
The mixing amount is greater than 0.12% to 0.22%, the net slurry mobility has a very significant increase;
The 1-hour fluidity loss decreases with the increase of dosage.
2. Mortar performance
The mortar water loss rate results and the net slurry fluidity results have a corresponding relationship, not only the net slurry fluidity, mortar water loss rate is also large;
The water reduction rate with the increase of the admixture, the water reduction rate increases quickly, and the water reduction rate is higher;
The water reduction rate of concrete as a result of the influence of admixture and sand and stone performance is often inconsistent with the mortar water reduction rate.When the properties of admixture and sand and stone are beneficial to the fluidity of concrete, the water reduction rate of concrete is higher than that of mortar, and vice versa.
Recommended dosage of polycarboxylic acid superplasticizer for powder
The recommended dosage of superplasticizer is 0.1~0.3% of the amount of cement.Polycarboxylate superplasticizer powder is the main component of polycarboxylate powder, its solid content is about 98%, normal content is 0.1% - 0.3%, general content is only 0.06%, has a 12% water reduction rate and 23% strength growth, has exceeded the market ordinary pumping agent effect.When the content is 0.1%, the performance exceeds the level of ordinary naphthalene series and pyrimidine efficient water-reducing agent.However, when the content is lower than 0.14%, the excellent performance is not obvious.When the content reaches 0.20%, the working performance and pumping performance of concrete are improved to a very excellent level.With high grade, high content of fly ash/slag powder concrete and concrete with special requirements, the content can be enlarged to 0.3%.
