What is a Concrete Water-Reducing Agent?
Water reducing agent is an essential component of concrete blends. It improves the fluidity of concrete, rendering it less difficult to blend and pour, thereby enhancing the workability of concrete for building.
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 the environmental conditions and building requirements. Proper application of water-reducing agents can boost the evenness of concrete, reduce concrete breaking, and boost the strength of concrete. The role of water-reducing agents also includes decreasing the water content of concrete, improving the strength of concrete, and boosting the overall performance of concrete. Additionally, water-reducing agents can reduce dust formation, diminish concrete shrinkage, boost concrete durability, improve the appearance of concrete, and improve concrete’s capability to corrosion.
What exactly are the features of concrete water-reducing agent?
The concrete water-reducing agent is an additive that minimizes the water usage of concrete while maintaining its fluidity fundamentally unchanged, hence enhancing the robustness and resilience of concrete, or enhancing the fluidity of concrete and enhancing the workability of concrete within the same concrete dosage and water-cement ratio.
1. Soothing 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 considerably greater than the molecular attraction between water molecules and cement particles. When adequate water-reducing agent is absorbed by the cement particles, using R-SO3θ and the hydrogen bonding in water molecules, in addition to the hydrogen bonding between water molecules, a stable solvated water film forms on the surface of cement particles. This coating functions 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 effectiveness of fresh commercial concrete. The lowering in surface free energy caused by natural wetting can be determined using the formula suggested by Glbbs.
3. Water-reducing effect.
After the addition of high-efficiency water-reducing agents in commercial concrete, the water-cement ratio can be significantly lowered 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%, thus the name high-efficiency water-reducing agent. The water reduction effect is largely attributed to the adsorption and diffusion of water-reducing agents in industrial concrete.
4. Plasticity-Enhancing result.
After adding a water-reducing additive to concrete, it can boost the workability while keeping the water-cement ratio unchanged. Common water-reducing agents, in case of maintaining the precise identical volume of cement, can make the brand-new industrial concrete slump increase by above 10cm; high-performance water-reducing agents can generate a slump of 25cm of commercial concrete.
Concrete water-reducing agent system of action presented
1. Distributing influence:
After the concrete is combined with water, due to the hydration of cement particles, the surface of cement particles forms a double electrical layer structure, causing the formation of a solvent water film and nonuniform charged surfaces between cement particles producing a bridging effect. This ensures 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. As the water-reducing agent is added, the water-reducing substance molecules can align themselves and adsorb on the surface of cement particles, creating a similarly charged surface (usually negative) on the cement particles. This causes electrostatic repulsion, prompting the cement particles to disperse from each other, disintegrating the bridging structure, and releasing the covered water. As a result, the water can flow more effectively, hence enhancing the fluidity of the concrete mix.
2. Lubrication impact:
The hydrophilic group in the water-reducing additive is highly polar, permitting the adsorption film of the water-reducing agent on the surface of cement particles to create a stable layer of solventized water film along with water molecules. This water film provides effective lubrication, considerably lowering the friction between cement particles and further boosting the workability of concrete.
3. Spatial site-resistance effect:
The water-reducing additive configuration with hydrophilic branched chains extends in a liquid mixture, forming 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 overlap. This leads in spatial site-resistance amongst cement particles, enhancing the repulsion of spatial site-resistance and increasing the cohesion blockage between cement particles, hence 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, possess branching chains transplanted 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 discharged, resulting in the emission of polycarboxylic acid with dispersing result. This enhances the scattering result of cement particles and regulates slump loss.
The volume of water-reducing additive is affected by the particle size as well as compressive endurance, etc., on the performance of concrete, and furthermore its quantity is also affected by weather troubles and construction needs. The proper use of water-reducing agents can enhance the uniformity of concrete, decrease the fracturing of the concrete, also elevate the strength of concrete. The function of water-reducing agents also consists of lowering the water material of concrete, which boosts the strength of concrete and makes the overall performance of concrete premium. Furthermore, water-reducing agents can also decrease the creation of dirt, lower the reducing of concrete, boost the sturdiness of concrete, boost the appearance of concrete, and improve the oxidation resistance of concrete.
Concrete Water-Reducing Vendor
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