Precisely What is a Concrete Water-Reducing Agent?
Concrete additive is an essential part of concrete blends. It improves the fluidity of concrete, rendering it simpler to blend and place, consequently improving 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 affected by environmental surroundings conditions and construction requirements. Proper application of water-reducing agents can enhance the evenness of concrete, minimize concrete cracking, and improve the strength of concrete. The role of water-reducing agents also includes reducing the water content of concrete, improving the robustness of concrete, and improving the overall quality of concrete. Additionally, water-reducing agents can lessen dust formation, diminish concrete shrinkage, improve concrete resilience, improve the appearance of concrete, and boost concrete’s resistance to corrosion.
What are the characteristics of concrete water-reducing agent?
The concrete water-reducing agent is an admix that minimizes the water usage of concrete while preserving its fluidity basically unchanged, therefore improving the robustness and durability of concrete, or enhancing the fluidity of concrete and improving the workability of concrete under the same concrete dosage and water-cement ratio.
1. Greasing effect.
The polar hydrophilic groups in the water-reducing agent position themselves to adsorb onto the surface of cement particles and quickly 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, using R-SO3θ and the hydrogen bonding in water molecules, along with the hydrogen bonding between water molecules, a stable solvated water film develops on the surface of cement particles. This film acts as a three-dimensional protective shield, 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 wetted by water, and the factors of wetting have a significant impact on the quality of fresh commercial concrete. The lowering in surface free energy resulted by naturally occurring moistening can be computed using the formula recommended by Glbbs.
3. Fluidity-enhancing effect.
After the addition of high-efficiency water-reducing agents in industrial concrete, the water-cement ratio can be significantly lowered 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%, thus the name high-efficiency water-reducing agent. The water reduction effect is mainly because of the adsorption and diffusion of water-reducing agents in commercial concrete.
4. Plasticizing result.
After adding a water-reducing representative to concrete, it can boost the fluidness while keeping the water-cement ratio constant. Common water-reducing agents, in case of keeping the precise same amount of cement, can create the fresh industrial concrete slump rise by more than 10cm; high-performance water-reducing agents can create a slump of 25cm of industrial concrete.
Concrete water-reducing agent system of action presented
1. Distributing influence:
After the concrete is combined with water, as a result of the hydration of cement particles, the surface of cement particles creates a double electrical layer structure, leading to the development of a solvent water film and anisotropic charged surfaces between cement particles making a bridging effect. This makes sure that 10% to 30% of the blend water is covered by the concrete particles and cannot take part in free flow and lubrication, thereby affecting the workability of the concrete mix. Whenever the water-reducing substance is added, the water-reducing agent molecules can align themselves and adsorb on the surface of cement particles, creating a likewise charged surface (normally negative) on the cement particles. This causes electrostatic repulsion, encouraging the cement particles to disperse from each other, disintegrating the bridging structure, and releasing the enclosed water. As a result, the water can flow more efficiently, therefore enhancing the flow of the concrete mix.
2. Lubrication effect:
The hydrophilic group in the water-reducing additive is highly polar, enabling the adsorption film of the water-reducing agent on the surface of cement particles to generate a stable layer of solventized water film through with water molecules. This water film offers effective lubrication, significantly decreasing the friction between cement particles and additional boosting the workability of concrete.
3. Spatial site-resistance effect:
The water-reducing substance configuration with hydrophilic branched chains stretches in a liquid solution, creating a compact hydrophilic three-dimensional adsorption coating on the surface of adsorbed cement particles. When the concrete particles are adjacent to each other, the adsorption layers commence to overlap. This leads in spatial site-resistance between cement particles, increasing the repulsion of spatial site-resistance and enhancing the bonding obstruction between cement particles, hence 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 branched chains implanted onto the molecules of the water-reducing additive. These branched chains provide both spatial site-resistance effects and, in the highly alkaline environment of cement hydration, can be slowly released, causing the emission of polycarboxylic acid with scattering result. This boosts the dispersion impact of cement particles and regulates slump loss.
The quantity of water-reducing additive is affected by the particle size as well as compressive stamina, etc., on the performance of concrete, and also its amount is similarly affected by weather troubles and construction requirements. The correct use of water-reducing agents can boost the uniformity of concrete, lower the cracking of the concrete, also elevate the resilience of concrete. The role of water-reducing agents furthermore consists of decreasing the water material of concrete, which increases the strength of concrete and makes the general performance of concrete premium. In addition, water-reducing agents can likewise decrease the creation of dirt, lower the contracting of concrete, increase the strength of concrete, enhance the look of concrete, and enhance 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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