Technical performance advantages of powder polycarboxylate superplasticizer


Release time:

2021-04-15

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Recommended dosage of powder polycarboxylate superplasticizer
 
The recommended dosage of water reducing agent is 0.1~0.3% of cement. Powder polycarboxylate superplasticizer is a powder with polycarboxylate as the main component, its solid content is about 98%, the normal dosage is 0.1-0.3, the general dosage is only 0.06, it has a 12% water reduction rate and 23% strength growth, has exceeded the effect of commercially available ordinary pumping agent. When the content is 0.1%, the performance exceeds the level of general naphthalene and pyridinamine superplasticizer. However, when the content is less than 0.14%, the excellence of the work performance is not obvious. When the content reaches more than 0.20%, the working performance and pumping performance of concrete are improved to a very good level. When high-grade, high-volume fly ash/slag powder concrete and concrete with special requirements are configured, the doping can be increased to 0.3%.
 
Powder polycarboxylate superplasticizer process characteristics:
 
Polycarboxylic acid powder breaks the convention in the production process, adopts the thermal synthesis process, greatly reduces the production cost in the energy consumption, does not add the isolation agent, the product purity is higher, the solid content is controlled at about 98%. In terms of product performance, high-purity products have the characteristics of low doping, high active ingredients and good collapse performance, further reducing customer costs.
 
Use method of powder polycarboxylate superplasticizer
1, according to the concrete design requirements, through the experiment to adjust the water consumption or sand rate, to achieve slump, strength, condensation conditions are to meet the requirements of the water reducing agent dosage.
2. Suitable for high performance concrete, high strength concrete, large flow concrete. When used for concrete higher than C50, raw materials should be selected according to relevant technical specifications, appropriate mixing process should be determined, and a certain amount of experimental data should be obtained. Make the production of concrete flow performance to meet the construction requirements, concrete strength should have a certain surplus coefficient.
  
Polycarboxylate-based high-performance water-reducing agent is a new generation of high-performance water-reducing agent at home and abroad in recent years. Compared to naphthalene and other traditional superplasticizer, polycarboxylate superplasticizer has many unique technical performance advantages:
(1) Low dosage and high water reduction rate;
(2) good retention of fluidity of concrete mixture;
(3) Good compatibility with cement;
(4) the prepared concrete shrinkage rate is small, which is conducive to improving the volume stability and durability of concrete;
(5) environmental protection and no pollution in the process of production and use, which belongs to the green admixture.
It is precisely because of the above performance advantages, polycarboxylate high-performance water-reducing agent in recent years began to attract extensive attention in the domestic engineering community, many important projects have been a large number of the use of this new type of water-reducing agent. It can be predicted that due to the above-mentioned unique performance advantages, polycarboxylate high-performance water reducing agent will quickly become the mainstream product in the water reducing agent market.
 
 

Key words:

Polycarboxylate superplasticizer