What is a Concrete Water-Reducing Agent?
Concrete additive is an important part of concrete blends. It boosts the consistency of concrete, rendering it less difficult to mix and place, thereby enhancing the workability of concrete for construction.
The quantity of water-reducing additive is affected by factors including particle size and compressive strength, among others, in connection with the performance of concrete, and its dosage is also affected by environmental surroundings conditions and building requirements. Proper application of water-reducing agents can boost the evenness of concrete, minimize concrete cracking, and boost the strength of concrete. The role of water-reducing agents also includes reducing the water content of concrete, improving the robustness of concrete, and enhancing the overall performance of concrete. Additionally, water-reducing agents can minimize dust formation, lessen concrete shrinkage, enhance concrete resilience, improve the appearance of concrete, and increase concrete’s capability to corrosion.
What are the features of concrete water-reducing agent?
The concrete water-reducing agent is an mixture that decreases the water usage of concrete while keeping its fluidity essentially unchanged, thus enhancing the strength and durability of concrete, or enhancing the fluidity of concrete and improving the workability of concrete in the same cement dosage and water-cement ratio.
1. Soothing effect.
The polar hydrophilic groups in the water-reducing agent position 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 sufficient 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 creates on the surface of cement particles. This layer acts as a three-dimensional protective layer, preventing direct contact between cement particles and operating as a lubricant between particles.
2. Moistening 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 effectiveness of fresh industrial concrete. The lowering in surface available energy resulted by natural moistening can be computed using the formula recommended by Glbbs.
3. Water-reducing effect.
After the addition of high-efficiency water-reducing agents in commercial concrete, the water-cement ratio can be substantially reduced while preserving 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 because of the adsorption and diffusion of water-reducing agents in industrial concrete.
4. Plasticizing result.
After adding a water-reducing agent to concrete, it can boost the fluidness while retaining the water-cement ratio unchanged. Common water-reducing agents, in case of maintaining the precise same quantity of cement, can make the new industrial concrete depression boost by above 10cm; high-performance water-reducing agents can generate a slump of 25cm of commercial concrete.
Concrete water-reducing agent process of action introduced
1. Distributing impact:
After the concrete is mixed with water, because of the hydration of cement particles, the surface of cement particles develops a double electrical layer structure, leading to the formation of a solvent water film and nonuniform charged surfaces between cement particles making a bridging effect. This guarantees that 10% to 30% of the combination water is enclosed by the concrete particles and cannot participate in free flow and lubrication, consequently affecting the workability of the concrete mix. As the water-reducing substance is added, the water-reducing agent molecules can align themselves and adsorb on the surface of cement particles, creating a similarly charged surface (typically negative) on the cement particles. This causes electrostatic repulsion, prompting the cement particles to disperse from each other, disrupting the bridging structure, and releasing the enveloped water. As a result, the water can flow more efficiently, therefore enhancing the workability 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 additive on the surface of cement particles to produce a stable layer of solventized water film along with water molecules. This water film provides efficient lubrication, considerably lowering the friction between cement particles and further improving the flow of concrete.
3. Spatial site-resistance effect:
The water-reducing additive configuration with hydrophilic branched chains stretches in a liquid mixture, developing a dense hydrophilic three-dimensional adsorption coating on the surface of adsorbed cement particles. When the concrete particles are near to each other, the adsorption layers begin to intersect. This results in spatial site-resistance among cement particles, increasing the repulsion of spatial site-resistance and improving the bonding blockage between cement particles, thus maintaining the desired slump of the concrete.
4. Slow-release impact of graft copolymerization branched chains:
New water-reducing agents, such as polycarboxylic acid water-reducing agents, have branching chains implanted onto the molecules of the water-reducing agent. These branched chains offer both spatial site-resistance effects and, in the highly alkaline environment of cement hydration, can be slowly released, leading to the release of polycarboxylic acid with dispersing result. This enhances the dispersion impact of cement particles and regulates slump loss.
The amount of water-reducing additive is influenced by the particle dimension as well as compressive strength, etc., on the performance of concrete, and additionally its volume is similarly impacted by climatic issues and construction needs. The proper use of water-reducing agents can enhance the uniformity of concrete, reduce the fracturing of the concrete, similarly raise the strength of concrete. The function of water-reducing agents additionally consists of reducing 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 also lower the creation of dirt, reduce the shrinking of concrete, increase the sturdiness of concrete, enhance the appearance of concrete, and improve the oxidation resistance of concrete.
Cement Water-Reducing Vendor
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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