What are the advantages of polycarboxylate superplasticizer compared to naphthalene superplasticizer?

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Shandong Xindadi Group


What are the advantages of polycarboxylate superplasticizer compared to naphthalene superplasticizer?

What are the advantages of polycarboxylate superplasticizer compared to naphthalene superplasticizer?
    Polycarboxylate superplasticizerCompared with naphthalene series water reducing agent mainly has different water reducing effect, the former has strong air-entraining isolation "ball" effect and reducing solid-liquid interface energy effect in addition to steric resistance repulsion; the latter is mainly based on electrostatic repulsion effect, and there is almost no other beneficial effect on water reduction. Usually the former dosage is between 0.05%~ 0.3%, the water reduction rate is 25%~ 35%, up to 40%; the latter dosage is 0.3%~ 1.5%, the best dosage is 0.5%~ 1.0%, the water reduction rate is between 15%~ 30%.
Practice has proved that polycarboxylate superplasticizer products than the traditional naphthalene pumping agent has a variety of advantages:
① Early strength, good enhancement effect, 3 days, 7 days compressive strength than naphthalene increased by 3~5Mpa,28 days increased by 4 ~ 10Mpa.
② The slump loss is less, and the slump loss is reduced by more than 50% compared with the use of naphthalene pumping agent under the same environment.
③ When superdoping, the final coagulation time is not prolonged excessively, and the phenomenon of bleeding and segregation is reduced. It can meet the production needs of high-grade concrete above C60.
④ less shrinkage of concrete, more than 60% less shrinkage than naphthalene, can reduce more than 80% of plastic shrinkage cracks.
⑤ High cost performance, although the unit price is slightly higher than the naphthalene system, but the amount of doping is less, thus reducing the cost.
⑥ There is no crystallization, no precipitation and no waste residue all the year round. Naphthalene series generally has more than 5% crystallization in winter, resulting in waste, and crystallization and precipitation are easy to block the pipeline, resulting in inaccurate measurement, thus increasing the risk of concrete quality accidents.
⑦ Non-toxic, harmless and pollution-free. Production is not like naphthalene as the use of formaldehyde, sulfuric acid and other toxic and harmful substances, the environment does not cause pollution, non-toxic to the human body.
⑧ The use of this product is higher than the naphthalene products made of concrete compactness, better durability, workability significantly improved, the rebar wrapping force greatly improved.
⑨ Good compatibility with various cements, good dispersion performance of cement, and significantly improve the working performance of concrete. The performance indicators are better than similar domestic products.
⑩ The country strongly supports the promotion and application, and the national high-speed railways, highways, nuclear energy facilities, and super high-rise buildings are designated to use this type of admixture. More than 90% of concrete in developed countries abroad use such products. Because of its superior performance, experts predict that China's mixing plant industry in the next 2. three years more than 90% of the popularity of the use of the product, because early use early benefit.
Taken together, the polycarboxylate superplasticizer has strong plasticity, can effectively control the loss of slump over time, and has little effect on the hardening time of concrete. The reinforcement effect is large, and it has anti-shrinkage, which can more effectively improve the impermeability and frost resistance of concrete, and thus can greatly improve the durability of concrete than other high-efficiency water reducing agents.

Key words:

Polycarboxylate superplasticizer