Precisely What is a Concrete Water-Reducing Agent?
Concrete additive is an important component of concrete blends. It boosts the fluidity of concrete, making it less difficult to blend and pour, consequently improving the flexibility of concrete for the construction industry.
The amount of water-reducing substance is influenced by factors like particle size and compressive strength, among others, in relation to the performance of concrete, and its dosage is also influenced by the environmental conditions and building requirements. Proper utilization of water-reducing agents can boost the uniformity of concrete, minimize concrete splitting, and improve the strength of concrete. The role of water-reducing agents also includes reducing the water content of concrete, increasing the strength of concrete, and boosting the overall effectiveness of concrete. Additionally, water-reducing agents can lessen dust development, lessen concrete shrinkage, improve concrete durability, boost the appearance of concrete, and improve concrete’s capability to corrosion.
What are the characteristics of concrete water-reducing agent?
The concrete water-reducing agent is an additive that minimizes the water usage of concrete while preserving its fluidity basically unchanged, thus enhancing the sturdiness and resilience of concrete, or enhancing the fluidity of concrete and enhancing the workability of concrete in the same concrete quantity and water-cement ratio.
1. Lubricating effect.
The polar hydrophilic groups in the water-reducing agent position 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 much higher 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 develops on the surface of cement particles. This film acts as a three-dimensional protective shield, preventing direct contact between cement particles and acting as a lubricant between particles.
2. Moistening effect.
After cement and water are mixed, the surface of the particles is moistened by water, and the factors of moistening have a significant impact on the quality of fresh industrial concrete. The decrease in surface available energy induced by natural moistening can be calculated 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 significantly lowered while maintaining 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 largely due to the adsorption and diffusion of water-reducing agents in industrial concrete.
4. Plasticizing effect.
After adding a water-reducing additive to concrete, it can boost the flow while maintaining the water-cement ratio unchanged. Common water-reducing agents, in case of keeping the specific same volume of cement, can produce the brand-new industrial concrete slump 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 impact:
After the concrete is mixed with water, due to the hydration of cement particles, the surface of cement particles creates a twofold electrical layer structure, resulting in the development of a solvent water film and nonuniform charged surfaces between cement particles making a bridging effect. This ensures that 10% to 30% of the mix water is covered by the concrete particles and cannot take part in free flow and lubrication, thereby affecting the fluidity of the concrete mix. As the water-reducing substance 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 releasing the enclosed water. As a result, the water can flow more efficiently, hence increasing the workability 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 agent on the surface of cement particles to create a stable layer of solventized water film through with water molecules. This water film offers effective lubrication, substantially reducing the friction between cement particles and further improving the workability of concrete.
3. Spatial site-resistance effect:
The water-reducing additive structure with hydrophilic branched chains stretches in a liquid mixture, forming a dense hydrophilic three-dimensional adsorption coating on the surface of adsorbed cement particles. When the concrete particles are close to each other, the adsorption layers start to overlap. This results in spatial site-resistance among cement particles, increasing the repulsion of spatial site-resistance and improving the cohesion blockage between cement particles, hence 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, have branched chains transplanted onto the molecules of the water-reducing additive. These branched chains offer both spatial site-resistance effects and, in the highly alkaline environment of cement hydration, can be slowly discharged, leading to the discharge of polycarboxylic acid with dispersing result. This enhances the dissemination impact of cement particles and regulates slump loss.
The volume of water-reducing additive is affected by the particulate size as well as compressive stamina, etc., on the performance of concrete, and additionally its quantity is likewise influenced by weather conditions troubles and construction requirements. The appropriate use of water-reducing agents can improve the uniformity of concrete, reduce the cracking of the concrete, izajoo also elevate the strength of concrete. The role of water-reducing agents additionally consists of reducing the water content of concrete, which increases the strength of concrete and makes the overall performance of concrete premium. Additionally, water-reducing agents can also lower the formation of dirt, lower the reducing of concrete, boost the strength of concrete, improve the appearance of concrete, and enhance the corrosion resistance of concrete.
Cement Water-Reducing Agent
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.