What is a Concrete Water-Reducing Agent?
Concrete superplasticizer is a vital component of concrete blends. It improves the consistency of concrete, creating it less difficult to blend and pour, thereby enhancing the workability of concrete for construction.
The quantity of water-reducing agent is influenced by factors like particle size and compressive strength, among others, with regards to the performance of concrete, and its application is also influenced by environmental conditions and construction requirements. Proper application of water-reducing agents can boost the uniformity of concrete, minimize concrete breaking, and increase the strength of concrete. The purpose of water-reducing agents also includes reducing the water content of concrete, improving the robustness of concrete, and improving the overall effectiveness of concrete. Additionally, water-reducing agents can reduce dust development, lessen concrete shrinkage, improve concrete resilience, enhance the appearance of concrete, and increase concrete’s capability to corrosion.
Exactly what are the characteristics of concrete water-reducing agent?
The concrete water-reducing agent is an mixture that reduces the water usage of concrete while maintaining its flow basically unchanged, hence enhancing the robustness and longevity 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 significantly 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 forms on the surface of cement particles. This layer serves as a three-dimensional protective shield, 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 wetted by water, and the factors of moistening have a significant impact on the performance of fresh industrial concrete. The decrease in surface available energy resulted by naturally occurring wetting can be determined using the formula recommended by Glbbs.
3. Water-reducing effect.
After the addition of high-efficiency water-reducing agents in commercial concrete, the water-cement ratio can be considerably 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%, thus the name high-efficiency water-reducing agent. The water reduction effect is primarily because of the adsorption and diffusion of water-reducing agents in commercial concrete.
4. Plasticizing effect.
After adding a water-reducing agent to concrete, it can boost the flow while keeping the water-cement ratio unchanged. Common water-reducing agents, in the event of retaining the precise similar volume of cement, can produce the new industrial concrete depression increase by over 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 impact:
After the concrete is combined with water, because of the hydration of cement particles, the surface of cement particles develops a twofold electrical layer structure, causing the creation of a solvent water film and asymmetrical charged areas between cement particles creating a bridging effect. This makes sure that 10% to 30% of the mix water is enclosed by the concrete particles and cannot take part in free flow and lubrication, thus affecting the workability of the concrete mix. When the water-reducing agent is added, the water-reducing agent molecules can position themselves and adsorb on the surface of cement particles, creating a comparably charged surface (usually negative) on the cement particles. This triggers electrostatic repulsion, urging the cement particles to disperse from each other, disrupting the bridging structure, and releasing the covered water. As a result, the water can flow more effectively, therefore increasing the flow of the concrete mix.
2. Lubrication influence:
The hydrophilic group in the water-reducing additive is highly polar, allowing the adsorption film of the water-reducing additive 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, considerably lowering the resistance between cement particles and furthermore improving the flow of concrete.
3. Spatial site-resistance influence:
The water-reducing additive structure with hydrophilic branched chains extends in a liquid solution, creating a dense hydrophilic three-dimensional adsorption coating on the surface of adsorbed cement particles. When the concrete particles are adjacent to each other, the adsorption layers begin to intersect. This results in spatial site-resistance among cement particles, enhancing the repulsion of spatial site-resistance and enhancing the cohesion hindrance between cement particles, therefore maintaining the desired slump of the concrete.
4. Slow-release effect 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, resulting in the discharge of polycarboxylic acid with scattering effect. This improves the dissemination effect of cement particles and manages slump loss.
The quantity of water-reducing agent is affected by the particle measurement as well as compressive endurance, etc., on the performance of concrete, and also its quantity is also impacted by climatic issues and construction needs. The correct use of water-reducing agents can enhance the uniformity of concrete, decrease the cracking of the concrete, also increase the strength of concrete. The role of water-reducing agents furthermore consists of reducing the water material of concrete, which improves the durability of concrete and makes the general performance of concrete premium. Additionally, water-reducing agents can similarly reduce the development of dirt, reduce the contracting of concrete, increase the durability of concrete, boost the appearance of concrete, and improve the corrosion resistance of concrete.
Concrete Water-Reducing Supplier
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