It is a professional and large-scale private enterprise engaged in the production of concrete additives.It is one of Concrete Admixture Polycarboxylic Acid factory in china.
We supply kinds of materials of Concrete Admixture Polycarboxylic Acid , For concrete additives,main products is polycarboxylate superplasticizer and so on.it can used in construction.
Concrete Admixture Polycarboxylic Acid factory--The structural properties of water reducer are briefly introduced
The molecular structure of polycarboxylic acid superplasticizer is in the shape of a comb, and its main chain contains more active groups, such as acid group (COOH), sulfonic acid group closure (SOH), hydroxyl group (one OH), and polyethane oxygen group (-(CH1CH2O0).
The molecular structure of polycarboxylic acid superplasticizer is in the shape of a comb, and its main chain contains more active groups, such as acid group (COOH), sulfonic acid group closure (SOH), hydroxyl group (one OH), and polyethane oxygen group (-(CH1CH2O0).- R), etc.The effect of each group on cement is different, for example, amine group has better dispersibility and retarder effect.The sulfonic acid group has good dispersibility;Hydroxyl not only has the retarding effect, but also plays the role of wetting.Polyethane - hydroxyl groups have the function of maintaining flow characteristics.Many scholars have studied the relationship between the structure and properties of polymeric acid series water-reducing agents from different aspects.
Some scholars studied the molecular structure of functional group and the water reducing agent for the influence of concrete cracking characteristics, the conclusion is: the molecular structure of poly (carboxylic acid series water reducing agent of hydroxyl resin base and carboxyl mole ratio of 1:1. 5, poly carboxylic acid series of water reducer for concrete has good anti-crack properties, branched chain polymerization degree is bigger, water reducing agent of molecular weight, improve the crack resistance of concrete;Cyclic and sulfonic acid groups have little influence on crack resistance of concrete.
Some scholars have studied the influence of different structure polycarboxylate superplasticizers on the characteristics of cement paste.The results show that the water-reducing agent with low side chain density, medium charge density and high relative molecular weight has better dispersibility, higher adsorption rate on cement particles and stronger retarder effect.
Compounding can make the performance of polycarboxylate superplasticizer more comprehensive, but it cannot solve the problem on the basis.Only when the relationship between the molecular structure and the properties of the superplasticizer is clarified, the superplasticizer with excellent properties and engineering requirements can be synthesized from the perspective of molecular structure design.
