What Exactly is a Concrete Water-Reducing Agent?
Concrete additive is an important part of concrete blends. It improves the flow of concrete, rendering it easier to incorporate and pour, thereby improving the workability of concrete for the construction industry.
The quantity of water-reducing agent is influenced by factors such as particle size and compressive strength, among others, with regards to the performance of concrete, and its dosage is also impacted by the environmental conditions and construction requirements. Proper usage of water-reducing agents can boost the evenness of concrete, decrease concrete breaking, and increase the strength of concrete. The role of water-reducing agents also includes lowering the water content of concrete, increasing the durability of concrete, and boosting the overall quality of concrete. Additionally, water-reducing agents can minimize dust development, reduce concrete shrinkage, boost concrete longevity, boost the appearance of concrete, and boost concrete’s capability to corrosion.
What exactly are the features of concrete water-reducing agent?
The concrete water-reducing agent is an mixture that decreases the water utilization of concrete while preserving its flow essentially unchanged, thus increasing the sturdiness and durability of concrete, or increasing the fluidity of concrete and boosting the workability of concrete within the same cement dosage and water-cement ratio.
1. Greasing effect.
The polar hydrophilic groups in the water-reducing agent position 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 considerably 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 forms on the surface of cement particles. This layer serves as a three-dimensional protective layer, 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 conditions of wetting have a significant impact on the effectiveness of fresh industrial concrete. The reduction in surface available energy induced by naturally occurring moistening can be computed using the formula recommended 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 reduced 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%, therefore the name high-efficiency water-reducing agent. The water reduction effect is primarily due to the adsorption and diffusion of water-reducing agents in industrial concrete.
4. Plasticity-Enhancing effect.
After adding a water-reducing agent to concrete, it can boost the workability while maintaining the water-cement ratio constant. Common water-reducing agents, in the event of keeping the specific similar amount of cement, can make the brand-new industrial concrete slump increase by over 10cm; high-performance water-reducing agents can generate a slump of 25cm of commercial concrete.
Concrete water-reducing agent process of action provided
1. Distributing effect:
After the concrete is mixed with water, because of the hydration of cement particles, the surface of cement particles develops a double electrical layer structure, leading to the formation of a solvent water film and asymmetrical charged surfaces between cement particles producing a bridging effect. This ensures that 10% to 30% of the mix water is covered by the concrete particles and cannot participate in free flow and lubrication, thus influencing the workability of the concrete mix. Whenever the water-reducing agent is added, the water-reducing additive molecules can align themselves and adsorb on the surface of cement particles, creating a likewise charged surface (typically negative) on the cement particles. This triggers electrostatic repulsion, encouraging the cement particles to disperse from each other, breaking down the bridging structure, and releasing the enveloped water. As a result, the water can flow more effectively, therefore improving the flow of the concrete mix.
2. Lubrication effect:
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 produce a stable layer of solventized water film along with water molecules. This water film gives effective lubrication, substantially decreasing the resistance between cement particles and further boosting the workability of concrete.
3. Spatial site-resistance impact:
The water-reducing substance structure with hydrophilic branched chains stretches in a liquid solution, creating a thick hydrophilic three-dimensional adsorption layer on the surface of adsorbed cement particles. When the concrete particles are near to each other, the adsorption layers begin to overlap. This results in spatial site-resistance between cement particles, increasing the repulsion of spatial site-resistance and enhancing the bonding obstruction between cement particles, therefore maintaining the desired 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 released, causing the emission of polycarboxylic acid with scattering effect. This enhances the dissemination impact of cement particles and regulates slump loss.
The volume of water-reducing representative is affected by the particle measurement as well as compressive endurance, etc., on the performance of concrete, and furthermore its amount is likewise affected by weather problems and construction requirements. The proper use of water-reducing agents can improve the uniformity of concrete, lower the fracturing of the concrete, likewise elevate the toughness of concrete. The role of water-reducing agents additionally consists of lowering the water material of concrete, which boosts the strength of concrete and makes the general performance of concrete premium. In addition, water-reducing agents can also decrease the creation of dirt, decrease the reducing of concrete, boost the strength of concrete, improve the appearance of concrete, and enhance the oxidation resistance of concrete.
Concrete Water-Reducing Supplier
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.