What is a Concrete Water-Reducing Agent?
Water reducing agent is an important component of concrete blends. It boosts the consistency of concrete, rendering it less difficult to incorporate and pour, consequently enhancing the flexibility of concrete for building.
The amount of water-reducing agent is affected by factors including particle size and compressive strength, among others, in relation to the performance of concrete, and its application is also affected by environmental conditions and construction requirements. Proper usage of water-reducing agents can improve the evenness of concrete, decrease concrete cracking, and improve the strength of concrete. The function of water-reducing agents also includes lowering the water content of concrete, enhancing the strength of concrete, and improving the overall performance of concrete. Additionally, water-reducing agents can minimize dust formation, reduce concrete shrinkage, enhance concrete resilience, improve the appearance of concrete, and boost concrete’s strength to corrosion.
Exactly what are the qualities of concrete water-reducing agent?
The concrete water-reducing agent is an mixture that decreases the water utilization of concrete while preserving its fluidity fundamentally unchanged, therefore increasing the strength and durability of concrete, or increasing the fluidity of concrete and enhancing the workability of concrete under the same concrete quantity 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 significantly greater 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 develops on the surface of cement particles. This film serves as a three-dimensional protective barrier, preventing direct contact between cement particles and operating 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 wetting have a significant impact on the performance of fresh industrial concrete. The lowering in surface available energy induced by natural wetting can be calculated 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 significantly decreased 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 primarily due to the adsorption and diffusion of water-reducing agents in commercial concrete.
4. Plasticity-Enhancing effect.
After adding a water-reducing additive to concrete, it can boost the flow while maintaining the water-cement ratio constant. Common water-reducing agents, in the event of maintaining the precise same amount of cement, can make the fresh industrial concrete depression boost by more than 10cm; high-performance water-reducing agents can produce a slump of 25cm of industrial concrete.
Concrete water-reducing agent system of action presented
1. Distributing influence:
After the concrete is mixed with water, because of the hydration of cement particles, the surface of cement particles develops a dual electrical layer structure, causing the development of a solvent water film and anisotropic charged surfaces between cement particles producing a bridging effect. This guarantees that 10% to 30% of the combination water is enveloped by the concrete particles and cannot take part in free flow and lubrication, thus impacting the fluidity of the concrete mix. Whenever the water-reducing additive is added, the water-reducing additive 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, prompting the cement particles to disperse from each other, disrupting the bridging structure, and emitting the covered water. As a result, the water can flow more effectively, therefore enhancing the fluidity of the concrete mix.
2. Lubrication influence:
The hydrophilic group in the water-reducing agent is highly polar, permitting the adsorption film of the water-reducing additive on the surface of cement particles to generate a stable layer of solventized water film along with water molecules. This water film gives effective lubrication, considerably lowering the resistance between cement particles and additional enhancing the flow of concrete.
3. Spatial site-resistance influence:
The water-reducing additive structure with hydrophilic branched chains extends in a liquid solution, developing a thick hydrophilic three-dimensional adsorption coating on the surface of adsorbed cement particles. When the concrete particles are adjacent to each other, the adsorption layers start to overlap. This results in spatial site-resistance amongst cement particles, enhancing the repulsion of spatial site-resistance and increasing the adhesion obstruction between cement particles, hence maintaining the preferred slump of the concrete.
4. Slow-release result of graft copolymerization branched chains:
New water-reducing agents, such as polycarboxylic acid water-reducing agents, possess branched chains implanted onto the molecules of the water-reducing agent. These branched chains offer both spatial site-resistance effects and, in the highly alkaline environment of cement hydration, can be slowly released, leading to the release of polycarboxylic acid with scattering result. This improves the dissemination effect of cement particles and controls slump loss.
The volume of water-reducing representative is influenced by the particle dimension as well as compressive strength, etc., on the performance of concrete, and furthermore its quantity is also impacted by weather conditions issues and construction needs. The appropriate use of water-reducing agents can enhance the uniformity of concrete, lower the cracking of the concrete, izajoo likewise elevate the resilience of concrete. The role of water-reducing agents furthermore consists of lowering the water content of concrete, which increases the strength of concrete and makes the general performance of concrete top-quality. In addition, water-reducing agents can also reduce the creation of dirt, reduce the shrinking of concrete, increase the strength of concrete, enhance the appearance of concrete, and boost the oxidation resistance of concrete.
Concrete Water-Reducing Vendor
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