What Exactly is a Concrete Water-Reducing Agent?
Water reducing agent is an important element of concrete blends. It enhances the consistency of concrete, creating it simpler to mix and place, consequently enhancing the workability of concrete for the construction industry.
The amount of water-reducing additive is influenced by factors such as particle size and compressive strength, among others, in relation to the performance of concrete, and its dosage is also influenced by the environmental conditions and construction requirements. Proper utilization of water-reducing agents can improve the evenness of concrete, minimize concrete splitting, and increase the strength of concrete. The purpose of water-reducing agents also includes lowering the water content of concrete, improving the strength of concrete, and boosting the overall effectiveness of concrete. Additionally, water-reducing agents can lessen dust development, diminish concrete shrinkage, improve concrete resilience, boost the appearance of concrete, and increase concrete’s strength to corrosion.
What are the features of concrete water-reducing agent?
The concrete water-reducing agent is an admix that reduces the water consumption of concrete while preserving its fluidity basically unchanged, thus enhancing the robustness and resilience of concrete, or raising the fluidity of concrete and enhancing the workability of concrete under the same cement quantity 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 sufficient water-reducing agent is absorbed by the cement particles, using 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 film serves as a three-dimensional protective layer, preventing direct contact between cement particles and functioning 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 moistening have a significant impact on the quality of fresh industrial concrete. The decrease in surface available energy induced by natural wetting can be determined using the formula advised by Glbbs.
3. Fluidity-enhancing effect.
After the addition of high-efficiency water-reducing agents in commercial concrete, the water-cement ratio can be substantially 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 due 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 flow while retaining the water-cement ratio unchanged. Common water-reducing agents, in the case of retaining the specific similar amount of cement, can make the new industrial concrete slump boost 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 provided
1. Distributing impact:
After the concrete is blended with water, due to the hydration of cement particles, the surface of cement particles develops a dual electrical layer structure, leading to 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 participate in free flow and lubrication, thereby impacting the fluidity of the concrete mix. Whenever the water-reducing additive is added, the water-reducing agent molecules can align themselves and adsorb on the surface of cement particles, creating a comparably charged surface (usually negative) on the cement particles. This causes electrostatic repulsion, prompting the cement particles to disperse from each other, breaking down the bridging structure, and releasing the enveloped water. As a result, the water can flow more effectively, hence improving the flow of the concrete mix.
2. Lubrication influence:
The hydrophilic group in the water-reducing substance is highly polar, permitting the adsorption film of the water-reducing additive on the surface of cement particles to create a steady layer of solventized water film through with water molecules. This water film gives efficient lubrication, significantly decreasing the resistance between cement particles and furthermore enhancing the workability of concrete.
3. Spatial site-resistance impact:
The water-reducing agent structure with hydrophilic branched chains extends in a liquid mixture, developing a thick hydrophilic three-dimensional adsorption layer on the surface of adsorbed cement particles. When the concrete particles are close to each other, the adsorption layers start to overlap. This results in spatial site-resistance between cement particles, raising the repulsion of spatial site-resistance and increasing the adhesion 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 branching chains grafted 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 discharged, leading to the emission of polycarboxylic acid with scattering result. This improves the scattering effect of cement particles and regulates slump loss.
The volume of water-reducing representative is impacted by the particle size as well as compressive strength, etc., on the performance of concrete, and additionally its quantity is likewise impacted by weather problems and construction demands. The appropriate use of water-reducing agents can improve the uniformity of concrete, reduce the fracturing of the concrete, izajoo also raise the strength of concrete. The function of water-reducing agents additionally consists of reducing the water substance of concrete, which increases the durability of concrete and makes the general performance of concrete premium. Additionally, water-reducing agents can similarly reduce the development of dirt, lower the shrinking of concrete, increase the durability of concrete, boost the look of concrete, and enhance the rust 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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