What is a Concrete Water-Reducing Agent?
Superplasticizer is a vital element of concrete blends. It boosts the consistency of concrete, making it easier to blend and place, consequently increasing the flexibility of concrete for the construction industry.
The amount of water-reducing substance is affected by factors including particle size and compressive strength, among others, in connection with 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 improve the consistency of concrete, decrease concrete breaking, and improve the strength of concrete. The function of water-reducing agents also includes decreasing the water content of concrete, improving the robustness of concrete, and boosting the overall quality of concrete. Additionally, water-reducing agents can reduce dust formation, diminish concrete shrinkage, enhance concrete durability, improve the appearance of concrete, and boost concrete’s strength to corrosion.
What exactly are the characteristics of concrete water-reducing agent?
The concrete water-reducing agent is an mixture that minimizes the water consumption of concrete while keeping its fluidity basically unchanged, thus enhancing the strength and resilience of concrete, or enhancing the fluidity of concrete and improving the workability of concrete within the same concrete dosage and water-cement ratio.
1. Lubricating effect.
The polar hydrophilic groups in the water-reducing agent orient 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, with the assistance of R-SO3θ and the hydrogen bonding in water molecules, in addition to the hydrogen bonding between water molecules, a stable solvated water film develops on the surface of cement particles. This layer serves as a three-dimensional protective barrier, preventing direct contact between cement particles and operating as a lubricant between particles.
2. Moistening effect.
After cement and water are mixed, the surface of the particles is wetted by water, and the parameters of wetting have a significant impact on the quality of fresh industrial concrete. The decrease in surface free energy caused by natural wetting can be determined using the formula suggested by Glbbs.
3. Fluidity-enhancing effect.
After the addition of high-efficiency water-reducing agents in industrial 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%, therefore 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. Plasticizing outcome.
After adding a water-reducing representative to concrete, it can boost the fluidness while keeping the water-cement ratio unchanged. Common water-reducing agents, in case of maintaining the exact identical quantity of cement, can make the brand-new industrial concrete slump rise 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 presented
1. Distributing influence:
After the concrete is blended with water, due to the hydration of cement particles, the surface of cement particles forms a double electrical layer structure, causing the development of a solvent water film and asymmetrical charged surfaces between cement particles producing a bridging effect. This guarantees that 10% to 30% of the mix water is enveloped by the concrete particles and cannot take part in free flow and lubrication, thereby impacting the fluidity of the concrete mix. As the water-reducing agent is added, the water-reducing agent molecules can orient themselves and adsorb on the surface of cement particles, creating a likewise charged surface (normally negative) on the cement particles. This causes electrostatic repulsion, urging the cement particles to disperse from each other, disintegrating the bridging structure, and emitting the covered water. As a result, the water can flow more effectively, therefore increasing the flow of the concrete mix.
2. Lubrication effect:
The hydrophilic group in the water-reducing substance 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, substantially reducing the resistance between cement particles and additional improving the flow of concrete.
3. Spatial site-resistance effect:
The water-reducing agent configuration with hydrophilic branched chains expands in a liquid mixture, forming a thick hydrophilic three-dimensional adsorption film on the surface of adsorbed cement particles. When the concrete particles are near to each other, the adsorption layers start to intersect. This results in spatial site-resistance among cement particles, raising the repulsion of spatial site-resistance and enhancing the adhesion 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, have branching chains implanted onto the molecules of the water-reducing additive. These branched chains provide both spatial site-resistance effects and, in the highly alkaline environment of cement hydration, can be slowly emitted, leading to the discharge of polycarboxylic acid with scattering impact. This improves the dissemination effect of cement particles and manages slump loss.
The quantity of water-reducing additive is influenced by the particle dimension as well as compressive stamina, etc., on the performance of concrete, and additionally its amount is also influenced by weather conditions troubles and construction requirements. The correct use of water-reducing agents can improve the uniformity of concrete, reduce the fracturing of the concrete, likewise raise the toughness of concrete. The function of water-reducing agents also consists of decreasing the water material of concrete, which improves the strength of concrete and makes the general performance of concrete top-quality. In addition, water-reducing agents can also decrease the creation of dirt, reduce the reducing of concrete, boost the sturdiness of concrete, improve the appearance of concrete, and improve the corrosion resistance of concrete.
Concrete Water-Reducing Vendor
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