Highly effective water-reducing agent (also known as superplasticizer) refers to the additive that can greatly reduce the water consumption of mixing under the condition of keeping the concrete slump basically the same.
High-efficiency water-reducing admixtures are widely used in concrete. It has a high water reduction rate and can reduce the water-cement ratio, thereby increasing the strength of concrete, while improving the compactness and durability of concrete.
Dispersion: After the cement is mixed with water, due to the hydration of the cement particles, a double electric layer structure is formed on the surface of the cement particles, causing a solvated water film to be formed, and the opposite charge on the surface of the cement particles causes association between the cement particles. , causing the cement slurry to form a flocculation structure, causing 10% to 30% of the mixing water to be wrapped in the cement particles and unable to participate in free flow and lubrication, thus affecting the fluidity of the concrete mixture. When the water-reducing agent is added, the water-reducing agent molecules can be directionally adsorbed on the surface of the cement particles, so that the surfaces of the cement particles have the same charge (usually negative charge), forming electrostatic repulsion, which promotes the mutual dispersion of the cement particles and the disintegration of the flocculation structure. , releasing part of the wrapped water to participate in the flow, thereby effectively increasing the fluidity of the concrete mixture.
Lubricant effect: The hydrophilic group in the water-reducing agent is very polar, so the adsorption film of the water-reducing agent on the surface of the cement particles can form a stable solvated water film with water molecules. This water film has a good lubrication effect. , can effectively reduce the sliding resistance between cement particles, thereby further improving the fluidity of concrete.
Steric hindrance: The hydrophilic branched chains in the superplasticizer structure extend in the aqueous solution, thereby forming a hydrophilic three-dimensional adsorption layer with a certain thickness on the surface of the adsorbed cement particles. When the cement particles are close to each other, the adsorption layers begin to overlap, that is, steric hindrance occurs between the cement particles. The more overlap, the greater the steric repulsion, and the greater the obstruction to the cohesion between cement particles, causing the concrete to collapse. The temperature remains good.
Slow-release effect of grafted copolymer branched chains: During the preparation process of new water-reducing agents such as polycarboxylate water-reducing agents, some branches are grafted on the molecules of the water-reducing agent. This branched chain can not only provide space Moreover, in the high alkalinity environment of cement hydration, the branch chain can be slowly cut off, thereby releasing polycarboxylic acid with a dispersing effect, which can improve the dispersion effect of cement particles and control slumpd drop loss.
Superplasticizer agent can be used in following aspects:
Plain concrete
Reinforced concrete
Prestressed concrete
Luoyang Trunnano Tech Co., Ltd is dedicated to concrete admixtures and foam concrete solutions for 10 years+, which is a professional company with supply and marketing integration.The company has a professional technical department and Quality Supervision Department, a well-equipped laboratory, and equipped with advanced testing equipment and after-sales customer service center.
We can supply polycarboxylate superplasticizer, concrete accelerator, concrete foaming agent, concrete reinforcement, redispersible polymer powder, HPMC hydroxypropyl methylcellulose, PVA fiber, PP fiber,etc.
1) Store in a dry environment at room temperature.
2) Avoid damp and high temperature.
3) Use immediately after opening the inner packing bag.
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FAQ
Q1:
What is concrete admixtures?
Re: Concrete admixtures, also known as concrete additives are natural or man-made chemicals or additives added during concrete mixing to enhance specific properties of fresh or hardened concrete, such as workability, durability, or early and final strength.
Q2:
What is PCE water reducer?
Re: Polycarboxylates (PCEs) are "new generation superplasticizers" that improve workability at low water-cement ratios to produce durable and flowable concrete, and are the backbone of these technologies.
Q3:
What role do superplasticizers play in concrete?
Re: Concrete superplasticizers (SP), also known as superplasticizers, are additives used to make high-strength concrete. Concrete plasticizers are compounds that produce concrete with about 15% less water. Superplasticizers can reduce water content by 30% or more.
Q4:
What is the advantage of the use of super plasticizers?
Re: Superplasticizers help maintain concrete strength, Improve bond strength, Greater volume stability and reduced shrinkage cracking, Increase wear resistance, etc.
What is the difference between water reducing agent and polymer?
Re: Superplasticizers and polymers are two different substances that differ in their chemical and physical properties.
Water-reducing admixture is a concrete admixture that can reduce mixing water consumption while maintaining the slump of concrete basically unchanged. Most of them are anionic surfactants, which have the characteristics of improving the workability of concrete, reducing unit water consumption, and improving the fluidity of concrete mixtures. In addition, different types of water reducing agents also have different characteristics, such as high water reducing rate, low dosage, good slump retention, good reinforcement, low alkali content, and little impact on setting time.
Polymers, also known as high molecular compounds, are organic compounds with a particularly large relative molecular mass and repeating structural units formed by thousands of atoms covalently bonded to each other. In real life, natural polymers include cellulose, protein, rubber, etc., while polymers manufactured in industry include various plastics, synthetic rubber, synthetic fibers, coatings, etc. Polymers have a variety of uses in the electrical and electronics industry, playing an important role in everything from insulating properties in plastic and rubber parts to conducting polymers.
Can water reducing agents replace polymers?
Re: Superplasticizers and polymers work differently in concrete and therefore cannot be directly substituted.
Water-reducing admixture is an admixture used to improve the workability and fluidity of concrete, reduce mixing water consumption, and improve the strength and durability of concrete. A polymer is a high molecular compound formed by covalent bonds and has repeating structural units. In concrete, polymers can play a role in thickening, bonding, anti-corrosion, waterproofing, etc., and improve the mechanical properties and durability of concrete.
Although both superplasticizers and polymers can improve performance in concrete, their chemical structures and mechanisms of action are different and cannot be directly substituted for each other. In practical applications, appropriate water reducing agents and polymers should be selected according to specific needs to achieve the best concrete performance results.
What will happen if you add too much water-reducing agent?
Re: Adding too much water reducing agent will adversely affect the performance of concrete.
When too much water-reducing agent is added, the fluidity and workability of concrete will deteriorate, and problems such as segregation, bleeding, and hardening will occur. In addition, excessive addition of water-reducing admixture may prolong the setting time of concrete and increase the air content, resulting in a reduction in concrete strength. In the case of a water-reducing admixture compounded with air-entraining components, the air content increases after over-admixing, and the strength of the concrete in the early and later stages may be reduced. If the air content exceeds a certain range, the strength of concrete at all ages will be seriously reduced, and even cause quality accidents.
What will happen if you add too little water reducing agent?
Re: If the water-reducing agent is not added enough, the fluidity of the concrete will be insufficient, making it difficult to meet the expected construction requirements. In this case, construction workers need to spend more time and energy to adjust the fluidity of concrete, which increases the difficulty and duration of construction. At the same time, adding too little water-reducing agent will make the strength of the concrete insufficient and affect the service life of the concrete. As the use time increases, some micro-cracks will occur in the concrete due to the effects of load and external environmental factors. If the strength of the concrete is not enough, these micro-cracks will expand quickly, resulting in a shortened service life of the concrete.
Will adding water-reducing admixture to concrete dry faster?
Re: Yes
Adding a superplasticizer to concrete does make the concrete dry faster. Water reducing agent can reduce the pores inside the concrete, reduce the resistance to mutual friction, and improve the fluidity and plasticity of the concrete. At the same time, water-reducing agents can also speed up the hardening of concrete, so the concrete dries faster. In addition, the water reducing agent can also delay the evaporation time of water molecules and increase the rate and efficiency of strength development during wet curing, thereby effectively improving the performance after hardening and reducing the shrinkage rate.
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