Polycarboxylic acid high-efficiency water reducing agent is characterized by low dosage and high water reducing rate. When the dosage is 0.15-0.3%, the water reduction rate can reach 18-40%.
What’s Advantage of High Range Water Reducer?
Introduce dehydrating agents
Water reducing agents are aggregates in which fine grained stones are no longer degradable and can reduce the mixed water content. Most of them are anionic surfactants such as lignosulfonate, naphthalene sulfonate formaldehyde polymer and so on. When added to concrete mixtures, it has the effect of reducing cement particles, increasing its activity, reducing the accumulation of drinking water and improving the water flow of the aggregates.
To reduce cement or save cement unit consumption. They are usually classified according to their chemical composition: lignosulfonate superplasticizer, naphthalene superplasticizer, melamine superplasticizer, sulfamatus superplasticizer, fatty acid superplasticizer, polycarboxylate superplasticizer.
History of development and main types of superplastics
In the early 1960s, the first generation of superplastic-based plastics and melamine-based superplastic resins were developed. In the 1930s they developed superplasticizers. Lignin sulfonate is also called a superplasticizer because it represents expansion. It is a second generation sulfamed superplasticizer, although chronologically it is only a second generation superplasticizer – third generation polycarboxylate.
Graft copolymers containing sulfonic acid rings and the original carboxylic acid groups are superplastic and effective for three generations. The water drop rate of the superplasticizer is more than 20%. The main chain is naphthalene, melamine chain and therefore the water-soluble reducing agent, of which the naphthalene series is the most important, 67%.
Especially in my country, most of the superplastic than naphthalene as superplasticizers, the main raw material is naphthalene. The Naphthalene superplastic series is the most used and widely used superplasticizer in my country (over 70% of the superplasticizer volume). They vary in programming time, are complicated in the combination of blocks, and are inexpensive with a wide variety of components and prices. Naphthalene-based water additives are commonly used to make stones with high fluidity, high strength and good strength.
The damage was accelerated by adding naphthalene to the water to reduce the reducing agent. In addition, some naphthalene -based superplasticizers are required to have a similarity to cement production.
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High range water reducer polyacid department
High range water reducer reduces the water content of the mixture in situations where rock deformation is of equal importance. A mixture mixed with water was reduced to less than 15%, while the broken stone remained uniform.
Superplastic has a positive effect on the cracking properties of mortar, which leads to greater impact of cement and mortar, reducing water content and improving mortar performance. However, some superplasticists cause bleeding and damage, and if the dose is too high, it can cause bleeding.
High range water reducer can never change the location of the room. If the dose is too high (overdose), it has little effect, but it does not increase the initial strength of the hard stone. Reduce water consumption and increase concrete strength for all ages. By maintaining constant strength, 10% or more of cement can be saved. The chloride ion concentration is significant and does not damage the metal strip.
In addition to the penetration, protection and corrosion of the rocks, it also increases the strength of the rocks. Superplastic polycarboxylate combs have a special structure, which promotes the cracking of cement particles by electrostatic effects and the sterile screw effect, increases the performance of the concrete mix, reduces water consumption and installs various stone materials.
Adjust frost resistance and permeability of rocks, including compressed, distracting, bending and elastic modules; The stone laying time can be adjusted by improving the quality of the stone; At the same time, it can reduce bleeding, improve kidney retention, and other effects can make the kidney last longer. Its effectiveness is 0.1% to 0.2%, fast dispersion of polycarboxylate superplasticizer, low cost, small stone loss, similar to different types of cement, obvious delay.
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Polycarboxylate high-efficiency water reducing agent is a kind of concrete admixture with high water reduction rate and low slump loss.