What is a Concrete Water-Reducing Agent?
Water reducing agent is a vital component of concrete blends. It enhances the fluidity of concrete, making it simpler to incorporate and place, thus enhancing the flexibility of concrete for building.
The volume of water-reducing additive is influenced by factors including particle size and compressive strength, among others, in relation to the performance of concrete, and its quantity is also affected by environmental surroundings conditions and building requirements. Proper utilization of water-reducing agents can enhance the uniformity 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, enhancing the durability of concrete, and enhancing the overall effectiveness of concrete. Additionally, water-reducing agents can minimize dust development, diminish concrete shrinkage, improve concrete resilience, improve the appearance of concrete, and improve concrete’s resistance to corrosion.
What are the characteristics of concrete water-reducing agent?
The concrete water-reducing agent is an admix that reduces the water utilization of concrete while preserving its flow fundamentally unchanged, thus improving the robustness and durability of concrete, or raising the fluidity of concrete and boosting 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 align 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 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, as well as the hydrogen bonding between water molecules, a stable solvated water film forms on the surface of cement particles. This coating acts as a three-dimensional protective barrier, 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 moistened by water, and the conditions of moistening have a significant impact on the performance of fresh industrial concrete. The lowering in surface available energy induced by natural wetting 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 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%, hence the name high-efficiency water-reducing agent. The water reduction effect is mainly because of the adsorption and diffusion of water-reducing agents in industrial concrete.
4. Plasticizing effect.
After adding a water-reducing representative to concrete, it can boost the fluidness while maintaining the water-cement ratio unchanged. Common water-reducing agents, in case of retaining the precise similar volume of cement, can make the new industrial concrete slump boost by above 10cm; high-performance water-reducing agents can generate a slump of 25cm of industrial concrete.
Concrete water-reducing agent process of action introduced
1. Distributing influence:
After the concrete is blended with water, because of the hydration of cement particles, the surface of cement particles develops a dual electrical layer structure, resulting in 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 combination water is enveloped by the concrete particles and cannot participate in free flow and lubrication, thereby impacting the flow of the concrete mix. As the water-reducing substance is added, the water-reducing additive molecules can orient themselves and adsorb on the surface of cement particles, creating a comparably charged surface (normally negative) on the cement particles. This triggers electrostatic repulsion, prompting the cement particles to disperse from each other, disrupting the bridging structure, and releasing the enclosed water. As a result, the water can flow more effectively, hence enhancing the flow of the concrete mix.
2. Lubrication impact:
The hydrophilic group in the water-reducing additive is highly polar, enabling the adsorption film of the water-reducing substance 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, considerably lowering the friction between cement particles and additional improving the fluidity of concrete.
3. Spatial site-resistance effect:
The water-reducing agent structure with hydrophilic branched chains expands in a liquid solution, developing a compact hydrophilic three-dimensional adsorption layer 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 amongst cement particles, raising the repulsion of spatial site-resistance and improving 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 transplanted onto the molecules of the water-reducing substance. These branched chains offer both spatial site-resistance effects and, in the highly alkaline environment of cement hydration, can be slowly emitted, causing the release of polycarboxylic acid with dispersing result. This enhances the scattering result of cement particles and controls slump loss.
The quantity of water-reducing representative is influenced by the particle measurement as well as compressive endurance, etc., on the performance of concrete, and additionally its volume is likewise influenced by climatic troubles and construction requirements. The proper use of water-reducing agents can enhance the uniformity of concrete, lower the fracturing of the concrete, izajoo also raise the toughness of concrete. The function of water-reducing agents furthermore consists of decreasing the water substance of concrete, which improves the strength of concrete and makes the overall performance of concrete top-quality. In addition, water-reducing agents can likewise lower the formation of dirt, reduce the shrinking of concrete, boost the durability of concrete, improve the appearance of concrete, and boost the rust resistance of concrete.
Concrete Water-Reducing Vendor
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])
We accept payment via Credit Card, T/T, West Union, and Paypal. TRUNNANO will ship the goods to customers overseas through FedEx, DHL, by air, or by sea.