What is a Concrete Water-Reducing Agent?
Water reducing agent is an important element of concrete blends. It enhances the flow of concrete, creating it simpler to incorporate and pour, consequently enhancing the workability of concrete for the construction industry.
The volume of water-reducing substance is impacted by factors including particle size and compressive strength, among others, with regards to the performance of concrete, and its quantity is also influenced by environmental conditions and construction and building requirements. Proper utilization of water-reducing agents can boost the evenness of concrete, minimize concrete breaking, and increase the strength of concrete. The function of water-reducing agents also includes reducing the water content of concrete, enhancing the durability of concrete, and improving the overall performance of concrete. Additionally, water-reducing agents can minimize dust development, diminish concrete shrinkage, improve concrete resilience, improve the appearance of concrete, and boost concrete’s strength to corrosion.
What are the characteristics of concrete water-reducing agent?
The concrete water-reducing agent is an admix that minimizes the water consumption of concrete while preserving its fluidity essentially unchanged, therefore increasing the robustness and resilience of concrete, or raising the fluidity of concrete and enhancing the workability of concrete within the same concrete dosage and water-cement ratio.
1. Greasing effect.
The polar hydrophilic groups in the water-reducing agent orient themselves to adsorb onto the surface of cement particles and readily 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, using R-SO3θ and the hydrogen bonding in water molecules, along with the hydrogen bonding between water molecules, a stable solvated water film creates on the surface of cement particles. This layer serves as a three-dimensional protective barrier, preventing direct contact between cement particles and acting as a lubricant between particles.
2. Moistening effect.
After cement and water are mixed, the surface of the particles is wetted by water, and the parameters of moistening have a significant impact on the effectiveness of fresh commercial concrete. The decrease in surface available energy caused by natural moistening 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 significantly lowered while retaining 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 primarily attributed to the adsorption and diffusion of water-reducing agents in commercial concrete.
4. Plasticizing effect.
After adding a water-reducing agent to concrete, it can increase the flow while maintaining the water-cement ratio unchanged. Common water-reducing agents, in case of keeping the specific identical quantity of cement, can produce the fresh industrial concrete depression increase by above 10cm; high-performance water-reducing agents can create a slump of 25cm of commercial concrete.
Concrete water-reducing agent system of action introduced
1. Distributing effect:
After the concrete is mixed with water, due to the hydration of cement particles, the surface of cement particles forms a twofold electrical layer structure, leading to the formation of a solvent water film and anisotropic charged surfaces between cement particles producing a bridging effect. This ensures that 10% to 30% of the mix water is enveloped by the concrete particles and cannot take part in free flow and lubrication, consequently affecting the flow of the concrete mix. Whenever the water-reducing agent is added, the water-reducing additive molecules can align themselves and adsorb on the surface of cement particles, creating a likewise charged surface (usually negative) on the cement particles. This causes electrostatic repulsion, urging the cement particles to disperse from each other, disintegrating the bridging structure, and emitting the covered water. As a result, the water can flow more effectively, therefore improving the workability of the concrete mix.
2. Lubrication effect:
The hydrophilic group in the water-reducing substance is highly polar, allowing the adsorption film of the water-reducing substance on the surface of cement particles to produce a stable layer of solventized water film along with water molecules. This water film offers effective lubrication, considerably lowering the friction between cement particles and furthermore enhancing the fluidity of concrete.
3. Spatial site-resistance impact:
The water-reducing substance structure with hydrophilic branched chains expands in a liquid mixture, forming a thick 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 overlap. This results in spatial site-resistance among cement particles, enhancing the repulsion of spatial site-resistance and increasing the cohesion blockage between cement particles, therefore maintaining the preferred 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 grafted onto the molecules of the water-reducing agent. These branched chains provide both spatial site-resistance effects and, in the highly alkaline environment of cement hydration, can be slowly emitted, causing the emission of polycarboxylic acid with dispersing impact. This boosts the dispersion effect of cement particles and regulates slump loss.
The volume of water-reducing representative is impacted by the particulate dimension as well as compressive strength, etc., on the performance of concrete, and additionally its volume is likewise impacted by weather conditions troubles and construction requirements. The correct use of water-reducing agents can boost the uniformity of concrete, lower the fracturing of the concrete, izajoo similarly elevate the resilience of concrete. The role of water-reducing agents furthermore consists of lowering the water substance of concrete, which improves the strength of concrete and makes the general performance of concrete top-quality. Furthermore, water-reducing agents can also reduce the formation of dirt, lower the shrinking of concrete, increase the strength of concrete, improve the appearance of concrete, and improve the rust resistance of concrete.
Cement Water-Reducing Vendor
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