What is the polycarboxylate based superplasticizer? Today I will give you more helpful information as follow.
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What is the polycarboxylate based superplasticizer?
The molecule of the polycarboxylate (salt) water reducing agent is a “comb-like” or “dendritic” structure artificially formed by “molecular design”.
And many branches with a certain length and stiffness are attached to the main chain of the molecule ( side chain).
There are also sulfonates or other groups on the main chain that can charge the cement particles, which can play the role of traditional polycarboxylate based superplasticizer.
The branched chains form a three-dimensional cross, which prevents the particles from approaching each other, thereby achieving the effect of dispersion (ie, water reduction).
This steric hindrance is not weakened with time, so the dispersing effect of the polycarboxylate based superplasticizer is more durable.
Polycarboxylate based superplasticizer has an artificially designed molecular structure. It has a high proportion of active ingredients and a concentrated molecular weight range.
Therefore, compared with other superplasticizers, Polycarboxylate based superplasticizer not only has a high water reduction rate, but also maintains a long slump.
And the dosage is smaller.
Due to its high technical advantages,polycarboxylate based superplasticizer have become a representative variety of a new generation of superplasticizers that are being developed around the world.
In Japan, in commercial concrete, polycarboxylate water reducer has replaced the position of naphthalene water reducer.
Polycarboxylic acid series high-performance water-reducing agent is the third generation of high-performance water-reducing agent developed after ordinary water-reducing agent represented by wood calcium and high-efficiency water-reducing agent represented by naphthalene series.
It is currently the most advanced in the world. , A high-efficiency water-reducing agent with the highest technology content, the best application prospect and the best comprehensive performance.
DH-4005 type polycarboxylic acid series high-performance water-reducing agent is the most advanced water-reducing agent product in the world today.
The performance comparison with similar products at home and abroad shows that the polycarboxylate-based high-performance superplasticizer has reached the international advanced level in terms of technical performance indicators and cost-effectiveness.
After adding water reducing agent into concrete, the hydrophobic group of the water reducing agent is directionally adsorbed on the surface of cement particles.
While the hydrophilic group points to the aqueous solution, forming a monomolecular or multi-molecular layer adsorption film.
Due to the directional adsorption of the surfactant, the surface of the cement colloid has the same sign of charge.
So under the action of the same sex and repulsion, not only can the cement-water system be in a relatively stable suspension state, but also the cement can be in a water-added state.
The flocculated structure formed in the initial stage is dispersed and disintegrated, thereby releasing the water in the flocculation structure to achieve the purpose of water reduction.
After the addition of the water reducing agent, not only the workability of the fresh concrete can be improved, but also because the water-cement ratio in the concrete is greatly reduced.
The internal pore volume of the cement stone is obviously reduced, the cement stone is denser, and the resistance of the concrete is reduced.
The compressive strength is significantly improved.
The addition of water reducing agent also affects the hydration rate and setting time of cement.
PCE is a game-changer in concrete technology and has demonstrated exceptional ability to increase the strength and durability of concrete.
Today, we’re delving into the world of polycarboxylate water reducers – a revolutionary material that is changing the way buildings are constructed.
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