some problems in the application of polycarboxylate superplasticizerii
Compatibility of polycarboxylate superplasticizer with other admixtures.
Beijing Dongke United Technologies Co.,Ltd.
What is high range water reducer?
High range water reducer is also superplasticizer.
Superplasticizer is an admixture that can greatly reduce the amount of mixing water, that is, the admixture that can greatly reduce the amount of mixing water under the condition that the concrete slump is basically the same is called a superplasticizer.
Superplasticizer is an admixture that can reduce the mixing water consumption by more than 15% under the condition that the concrete slump is basically the same.
The first generation of superplasticizers—naphthalene-based superplasticizers and melamine resin-based superplasticizers were developed in the early 1960s. Due to their better performance than ordinary superplasticizers, they were developed in the late 1930s. Lignin sulfonate is the representative – there is a significant improvement, so it is also called superplasticizer.
The second generation of superplasticizers is sulfamate, although in chronological order it is after the third generation of superplasticizers – polycarboxylate. The graft copolymer with both sulfonic acid group and carboxylic acid group is the most important and the best performance superplasticizer in the third generation superplasticizer.
The high range water reducer can reduce water by more than 20%. Mainly naphthalene series, melamine series and their compounded superplasticizers, of which naphthalene series are the main ones, and naphthalene series water reducers are often used to formulate high fluidity, high strength and high performance concrete. The slump loss of concrete simply mixed with naphthalene water reducing agent is faster. In addition, the adaptability of naphthalene-based superplasticizers to certain cements needs to be improved.
Superplasticizer has a strong dispersing effect on cement, which can greatly improve the fluidity of cement mixture and concrete slump, while greatly reducing water consumption and significantly improving concrete workability. However, some superplasticizers will accelerate the loss of concrete slump, and if the dosage is too large, it will cause bleeding.
Superplasticizer does not change the setting time of concrete basically. When the dosage is large (overdosage), it has a slight setting retardation effect, but it does not delay the growth of the early strength of hardened concrete.
The high range water reducer can greatly reduce the water consumption and significantly improve the strength of concrete at all ages. While keeping the strength constant, cement savings of 10% or more can be achieved.
The high range water reducer has very little chloride ion content and does not corrode steel bars. It can enhance the impermeability, freeze-thaw resistance and corrosion resistance of concrete, and improve the durability of concrete.
The high range water reducer is applicable
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Compatibility of polycarboxylate superplasticizer with other admixtures.
Polycarboxylic acid high-efficiency water reducing agent is characterized by low dosage and high water reducing rate.
Polycarboxylic acid water reducing agent with high efficient water reducing performance is often used in construction concrete.
Polycarboxylate superplasticizer is a new generation of water-reducing agent based on modified polycarboxylic acid.
Polycarboxylate (PCE) superplasticizers are known as high range water-reducing admixtures in concretes, such as ready-mix concretes, self-compacting concretes (SCC), ultra-high strength concretes (UHPC) and at the same time give an extended slump retention.
The polycarboxylic acid-based high-performance water-reducing agent, has truly designed an effective molecular structure based on the mechanism of dispersed cement. It has a super-dispersed type and can prevent concrete slump loss.