Compatibility of polycarboxylate superplasticizer with other admixtures.
About Concrete Additives
Concrete Additives are chemical substance that is added in the process of mixing concrete, accounting for less than 5% of the cement mass, and can significantly improve the performance of concrete. The characteristics of concrete admixtures are many varieties and small dosage, which have a great impact on the performance of concrete, and have the characteristics of less investment, quick effect, and significant technical and economic benefits. With the continuous advancement of science and technology, admixtures have been used more and more, and admixtures have become the fifth important component of concrete in addition to the four basic components.
Admixtures can improve the anti-carbonation performance of concrete to a certain extent. There is a certain linear relationship between the carbonation depth and porosity of concrete. Admixtures have a great influence on the frost resistance of concrete. It has good performance, but the single addition of early strength agent has no effect on the frost resistance of concrete.
The commonly used concrete admixtures are mainly naphthalene superplasticizers, polycarboxylate superplasticizers and aliphatic superplasticizers.
Naphthalene-based superplasticizer: Naphthalene-based superplasticizer is a chemically synthesized non-air-entraining superplasticizer. The chemical name is naphthalene sulfonate formaldehyde condensate, which has a strong dispersing effect on cement particles. For the preparation of large-flow concrete, cast-in-place concrete and prefabricated components with early strength and high strength requirements, it has a good use effect, can comprehensively improve and improve various properties of concrete, and is widely used in highways, bridges, dams, ports. Wharf, tunnel, electric power, water conservancy and civil engineering, steam curing and natural curing prefabricated components, etc.
About concrete additives Performance characteristics
- When the concrete strength and slump are basically the same, the cement dosage can be reduced by 10-25%.
When the water-cement ratio remains unchanged, the initial slump of concrete is increased by more than 10cm, and the water reduction rate can reach 15-25%.
It has significant early strength and enhancement effects on concrete, and its strength is increased by 20-60%.
Improve the workability of concrete and comprehensively improve the physical and mechanical properties of concrete.
Good adaptability to various cements and good compatibility with other types of concrete admixtures.
It is especially suitable for use in the following concrete projects: fluidized concrete, plasticized concrete, steam-cured concrete, impermeable concrete, waterproof concrete, natural curing prefabricated concrete, reinforced and prestressed reinforced concrete, high-strength ultra-high-strength concrete.
- Find the optimal dosage through experiments, the recommended dosage is 1.5-2%;
The aliphatic superplasticizer is added to the concrete together with the mixing water, or a post-addition method can be adopted, and the aliphatic superplasticizer is added to the concrete to prolong the stirring for 30s;
Due to the high water-reducing rate of the aliphatic superplasticizer, a layer of yellow slurry will be secreted on the surface before the initial setting of the concrete, which is a normal phenomenon. After finishing the concrete, the color will be eliminated, or after the concrete is strengthened, the color will be eliminated naturally, and the color will be eliminated faster by watering and curing, without affecting the internal and surface properties of the concrete.
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Polycarboxylic acid high-efficiency water reducing agent is characterized by low dosage and high water reducing rate.