What is a Concrete Water-Reducing Agent?
Concrete additive is an essential element of concrete blends. It boosts the consistency of concrete, rendering it less difficult to blend and place, thus increasing the manageability of concrete for building.
The quantity of water-reducing agent is affected 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 usage of water-reducing agents can boost the uniformity of concrete, reduce concrete cracking, and increase the strength of concrete. The role of water-reducing agents also includes lowering the water content of concrete, increasing the durability of concrete, and improving the overall quality of concrete. Additionally, water-reducing agents can lessen dust development, diminish concrete shrinkage, boost concrete resilience, improve the appearance of concrete, and improve concrete’s strength to corrosion.
What are the qualities of concrete water-reducing agent?
The concrete water-reducing agent is an admix that minimizes the water usage of concrete while keeping its flow fundamentally unchanged, hence increasing the robustness and longevity of concrete, or enhancing the fluidity of concrete and boosting the workability of concrete under the same concrete quantity 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 sufficient water-reducing agent is absorbed by the cement particles, with the assistance of 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 functions as a three-dimensional protective shield, 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 moistened by water, and the conditions of wetting have a significant impact on the quality of fresh commercial concrete. The decrease in surface free energy caused by naturally occurring wetting can be calculated using the formula recommended by Glbbs.
3. Water-reducing effect.
After the addition of high-efficiency water-reducing agents in industrial concrete, the water-cement ratio can be substantially decreased 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%, hence 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 additive to concrete, it can increase the flow while retaining the water-cement ratio constant. Common water-reducing agents, in case of maintaining the specific identical volume of cement, can make the new industrial concrete depression rise 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 effect:
After the concrete is blended with water, due to the hydration of cement particles, the surface of cement particles creates a double electrical layer structure, causing the creation of a solvent water film and anisotropic charged surfaces between cement particles producing a bridging effect. This makes sure that 10% to 30% of the combination water is enveloped by the concrete particles and cannot participate in free flow and lubrication, thereby impacting the fluidity of the concrete mix. As the water-reducing agent is added, the water-reducing substance molecules can position themselves and adsorb on the surface of cement particles, creating a comparably charged surface (normally negative) on the cement particles. This induces 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 effectively, thus enhancing the workability of the concrete mix.
2. Lubrication influence:
The hydrophilic group in the water-reducing additive 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 along with water molecules. This water film offers effective lubrication, significantly lowering the resistance between cement particles and additional enhancing the workability of concrete.
3. Spatial site-resistance impact:
The water-reducing additive structure with hydrophilic branched chains stretches in a liquid solution, developing a compact hydrophilic three-dimensional adsorption layer on the surface of adsorbed cement particles. When the concrete particles are close to each other, the adsorption layers commence to intersect. This causes in spatial site-resistance between cement particles, raising the repulsion of spatial site-resistance and improving the adhesion hindrance between cement particles, therefore 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 transplanted onto the molecules of the water-reducing substance. These branched chains offer both spatial site-resistance impacts and, in the highly alkaline environment of cement hydration, can be slowly released, causing the discharge of polycarboxylic acid with dispersing result. This improves the dispersion effect of cement particles and controls slump loss.
The amount of water-reducing additive is impacted by the particle dimension as well as compressive stamina, etc., on the performance of concrete, and furthermore its volume is also affected by weather issues and construction needs. The proper use of water-reducing agents can enhance the uniformity of concrete, lower the cracking of the concrete, likewise increase the resilience of concrete. The role of water-reducing agents also consists of reducing the water substance of concrete, which improves the durability of concrete and makes the general performance of concrete premium. Additionally, water-reducing agents can similarly lower the creation of dirt, reduce the reducing of concrete, increase the durability of concrete, improve the look of concrete, and boost the oxidation resistance of concrete.
Cement 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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