What is a Concrete Water-Reducing Agent?
Water reducing agent is an important element of concrete blends. It enhances the consistency of concrete, creating it easier to blend and pour, thus enhancing the manageability of concrete for construction.
The volume of water-reducing agent is impacted by factors including particle size and compressive strength, among others, in relation to the performance of concrete, and its quantity is also influenced by the environmental conditions and building requirements. Proper usage of water-reducing agents can boost the uniformity of concrete, decrease concrete cracking, and increase the strength of concrete. The purpose of water-reducing agents also includes reducing the water content of concrete, increasing the durability of concrete, and enhancing the overall effectiveness of concrete. Additionally, water-reducing agents can reduce dust creation, diminish concrete shrinkage, boost concrete resilience, enhance 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 admix that minimizes the water utilization of concrete while keeping its flow fundamentally unchanged, therefore improving the strength and resilience of concrete, or raising the fluidity of concrete and improving the workability of concrete under the same concrete dosage and water-cement ratio.
1. Lubricating effect.
The polar hydrophilic groups in the water-reducing agent align 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 significantly greater than the molecular attraction between water molecules and cement particles. When ample 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 creates on the surface of cement particles. This film functions as a three-dimensional protective layer, preventing direct contact between cement particles and acting 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 parameters of moistening have a significant impact on the effectiveness of fresh commercial concrete. The reduction in surface available energy induced by natural moistening can be computed using the formula advised 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 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 primarily because of the adsorption and diffusion of water-reducing agents in industrial concrete.
4. Plasticity-Enhancing outcome.
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 case of keeping the exact similar amount of cement, can produce the fresh industrial concrete depression increase 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 introduced
1. Distributing impact:
After the concrete is combined with water, due to the hydration of cement particles, the surface of cement particles develops a double electrical layer structure, leading to the development of a solvent water film and anisotropic charged areas between cement particles producing a bridging effect. This makes sure that 10% to 30% of the combination water is enclosed by the concrete particles and cannot participate in free flow and lubrication, thereby influencing the flow of the concrete mix. Whenever the water-reducing substance is added, the water-reducing agent molecules can align themselves and adsorb on the surface of cement particles, creating a similarly charged surface (typically negative) on the cement particles. This causes electrostatic repulsion, urging the cement particles to disperse from each other, disrupting the bridging structure, and emitting the covered water. As a result, the water can flow more effectively, therefore improving the fluidity of the concrete mix.
2. Lubrication effect:
The hydrophilic group in the water-reducing agent is highly polar, allowing the adsorption film of the water-reducing substance on the surface of cement particles to generate a stable layer of solventized water film through with water molecules. This water film gives efficient lubrication, significantly reducing the friction between cement particles and further boosting the flow of concrete.
3. Spatial site-resistance impact:
The water-reducing substance configuration with hydrophilic branched chains extends in a liquid solution, creating a thick hydrophilic three-dimensional adsorption layer on the surface of adsorbed cement particles. When the concrete particles are close to each other, the adsorption layers start to overlap. This leads in spatial site-resistance amongst cement particles, raising the repulsion of spatial site-resistance and improving the cohesion obstruction between cement particles, hence 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 branched chains transplanted onto the molecules of the water-reducing agent. These branched chains provide both spatial site-resistance effects and, in the highly alkaline environment of cement hydration, can be slowly discharged, leading to the release of polycarboxylic acid with dispersing result. This improves the dispersion result of cement particles and manages slump loss.
The quantity of water-reducing additive is affected by the particulate dimension as well as compressive stamina, etc., on the performance of concrete, and furthermore its quantity is likewise affected by weather problems and construction requirements. The proper use of water-reducing agents can boost the uniformity of concrete, reduce the cracking of the concrete, also increase the strength of concrete. The role of water-reducing agents additionally consists of lowering the water content of concrete, which improves the durability of concrete and makes the overall performance of concrete top-quality. In addition, water-reducing agents can similarly reduce the formation of dirt, lower the contracting of concrete, increase the durability of concrete, improve the appearance of concrete, and enhance the rust resistance of concrete.
Concrete Water-Reducing Vendor
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.