Precisely What is a Concrete Water-Reducing Agent?
Concrete additive is an essential part of concrete blends. It improves the flow of concrete, rendering it easier to mix and place, thus enhancing the flexibility of concrete for the construction industry.
The quantity of water-reducing substance is affected by factors such as particle size and compressive strength, among others, in connection with the performance of concrete, and its application is also influenced by environmental surroundings conditions and building requirements. Proper application of water-reducing agents can boost the evenness of concrete, reduce concrete cracking, and improve the strength of concrete. The role of water-reducing agents also includes decreasing the water content of concrete, enhancing the durability of concrete, and boosting the overall effectiveness of concrete. Additionally, water-reducing agents can lessen dust formation, diminish concrete shrinkage, improve concrete durability, boost the appearance of concrete, and boost concrete’s capability to corrosion.
What are the features of concrete water-reducing agent?
The concrete water-reducing agent is an additive that minimizes the water consumption of concrete while keeping its fluidity essentially unchanged, therefore increasing the robustness and resilience of concrete, or increasing the fluidity of concrete and boosting the workability of concrete in the same concrete dosage and water-cement ratio.
1. Lubricating effect.
The polar hydrophilic groups in the water-reducing agent align themselves to adsorb onto the surface of cement particles and easily bond to water molecules through hydrogen bonds. The strength of this hydrogen bonding is much higher than the molecular attraction between water molecules and cement particles. When ample water-reducing agent is absorbed by the cement particles, with the assistance of R-SO3θ and the hydrogen bonding in water molecules, as well as the hydrogen bonding between water molecules, a stable solvated water film forms on the surface of cement particles. This coating acts as a three-dimensional protective layer, preventing direct contact between cement particles and acting as a lubricant between particles.
2. Wetting effect.
After cement and water are mixed, the surface of the particles is moistened by water, and the factors of moistening have a significant impact on the quality of fresh industrial concrete. The lowering in surface free energy resulted by natural wetting can be calculated using the formula suggested by Glbbs.
3. Fluidity-enhancing effect.
After the addition of high-efficiency water-reducing agents in industrial concrete, the water-cement ratio can be considerably reduced while maintaining fluidity. High-efficiency water-reducing agents have a water reduction rate of up to 10% to 25%, while regular water-reducing agents have a water reduction rate of 5% to 15%, hence the name high-efficiency water-reducing agent. The water reduction effect is primarily attributed to the adsorption and diffusion of water-reducing agents in commercial concrete.
4. Plasticizing result.
After adding a water-reducing agent to concrete, it can increase the fluidness while keeping the water-cement ratio constant. Common water-reducing agents, in the event of retaining the specific same volume of cement, can create the fresh industrial concrete slump rise by over 10cm; high-performance water-reducing agents can generate a slump of 25cm of industrial concrete.
Concrete water-reducing agent system of action presented
1. Distributing influence:
After the concrete is mixed with water, because of the hydration of cement particles, the surface of cement particles creates a dual electrical layer structure, resulting in the formation of a solvent water film and nonuniform charged areas between cement particles making a bridging effect. This ensures that 10% to 30% of the blend water is enclosed by the concrete particles and cannot participate in free flow and lubrication, consequently impacting the workability of the concrete mix. Whenever the water-reducing substance is added, the water-reducing substance molecules can position themselves and adsorb on the surface of cement particles, creating a similarly charged surface (typically negative) on the cement particles. This induces electrostatic repulsion, encouraging the cement particles to disperse from each other, breaking down the bridging structure, and emitting the enclosed water. As a result, the water can flow more effectively, thus increasing the flow of the concrete mix.
2. Lubrication effect:
The hydrophilic group in the water-reducing substance is highly polar, enabling the adsorption film of the water-reducing substance on the surface of cement particles to produce a steady layer of solventized water film along with water molecules. This water film provides effective lubrication, significantly decreasing the friction between cement particles and furthermore enhancing the fluidity of concrete.
3. Spatial site-resistance impact:
The water-reducing agent structure with hydrophilic branched chains extends in a liquid solution, forming a dense hydrophilic three-dimensional adsorption film on the surface of adsorbed cement particles. When the concrete particles are near to each other, the adsorption layers commence to intersect. This causes in spatial site-resistance among cement particles, increasing the repulsion of spatial site-resistance and improving the bonding blockage between cement particles, therefore maintaining the desired slump of the concrete.
4. Slow-release result of graft copolymerization branched chains:
New water-reducing agents, such as polycarboxylic acid water-reducing agents, possess branched chains transplanted onto the molecules of the water-reducing agent. These branched chains provide both spatial site-resistance impacts and, in the highly alkaline environment of cement hydration, can be slowly emitted, leading to the release of polycarboxylic acid with scattering impact. This enhances the dissemination result of cement particles and regulates slump loss.
The volume of water-reducing additive is impacted by the particulate size as well as compressive endurance, etc., on the performance of concrete, and additionally its volume is also impacted by climatic problems and construction needs. The proper use of water-reducing agents can enhance the uniformity of concrete, reduce the cracking of the concrete, also raise the toughness of concrete. The role of water-reducing agents also consists of lowering the water material of concrete, which improves the strength of concrete and makes the general performance of concrete premium. In addition, water-reducing agents can likewise lower the formation of dirt, reduce the reducing of concrete, increase the strength of concrete, enhance the look of concrete, and boost the oxidation resistance of concrete.
Concrete Water-Reducing Supplier
TRUNNANO is a reliable concrete additives supplier with over 12-year experience in nano-building energy conservation and nanotechnology development.
If you are looking for high-quality concrete additives Concrete water-reducing agent, please feel free to contact us and send an inquiry. ([email protected])
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