What is a Concrete Water-Reducing Agent?
Water reducing agent is an essential part of concrete blends. It enhances the consistency of concrete, making it easier to incorporate and pour, thus enhancing the flexibility of concrete for building.
The quantity of water-reducing substance is impacted 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 improve the consistency of concrete, minimize concrete breaking, and boost the strength of concrete. The role of water-reducing agents also includes decreasing the water content of concrete, increasing the strength of concrete, and improving the overall performance of concrete. Additionally, water-reducing agents can reduce dust creation, reduce concrete shrinkage, improve concrete durability, improve the appearance of concrete, and improve concrete’s resistance to corrosion.
What exactly are the characteristics of concrete water-reducing agent?
The concrete water-reducing agent is an additive that decreases the water usage of concrete while keeping its fluidity essentially unchanged, thus improving the robustness and longevity of concrete, or raising the fluidity of concrete and boosting the workability of concrete within the same concrete quantity 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 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, with the assistance of 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 layer functions 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 conditions of wetting have a significant impact on the quality of fresh industrial concrete. The decrease in surface free energy resulted by natural wetting can be computed using the formula suggested 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 lowered 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 mainly because of the adsorption and diffusion of water-reducing agents in commercial concrete.
4. Plasticizing outcome.
After adding a water-reducing representative to concrete, it can boost the fluidness while maintaining the water-cement ratio constant. Common water-reducing agents, in the case of maintaining the exact similar volume of cement, can make the brand-new industrial concrete slump increase by above 10cm; high-performance water-reducing agents can produce a slump of 25cm of commercial concrete.
Concrete water-reducing agent system of action presented
1. Distributing impact:
After the concrete is blended with water, due to the hydration of cement particles, the surface of cement particles forms a twofold electrical layer structure, leading to the creation of a solvent water film and nonuniform charged areas between cement particles creating a bridging effect. This guarantees that 10% to 30% of the mix water is enveloped by the concrete particles and cannot participate in free flow and lubrication, consequently affecting the flow 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 triggers electrostatic repulsion, prompting the cement particles to disperse from each other, breaking down the bridging structure, and emitting the enveloped water. As a result, the water can flow more efficiently, therefore improving the flow 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 agent on the surface of cement particles to generate a stable layer of solventized water film along with water molecules. This water film provides effective lubrication, significantly reducing the friction between cement particles and further boosting the workability of concrete.
3. Spatial site-resistance impact:
The water-reducing additive structure with hydrophilic branched chains stretches in a liquid solution, forming a compact hydrophilic three-dimensional adsorption film on the surface of adsorbed cement particles. When the concrete particles are adjacent to each other, the adsorption layers start to overlap. This leads in spatial site-resistance between cement particles, enhancing the repulsion of spatial site-resistance and increasing the adhesion hindrance between cement particles, hence maintaining the desired 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 transplanted onto the molecules of the water-reducing substance. These branched chains provide both spatial site-resistance impacts and, in the highly alkaline environment of cement hydration, can be slowly emitted, causing the emission of polycarboxylic acid with scattering result. This improves the dispersion result of cement particles and regulates slump loss.
The volume of water-reducing representative is influenced by the particle dimension as well as compressive endurance, etc., on the performance of concrete, and additionally its amount is also influenced by weather conditions issues and construction requirements. The proper use of water-reducing agents can enhance the uniformity of concrete, lower the cracking of the concrete, izajoo likewise raise the toughness of concrete. The function of water-reducing agents furthermore consists of reducing the water substance of concrete, which boosts the durability of concrete and makes the general performance of concrete premium. Additionally, water-reducing agents can similarly decrease the formation of dirt, decrease the shrinking of concrete, boost the strength of concrete, boost the look of concrete, and boost the rust resistance of concrete.
Cement Water-Reducing Agent
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