What is a Concrete Water-Reducing Agent?
Concrete additive is a vital component of concrete blends. It boosts the flow of concrete, creating it less difficult to incorporate and place, thus improving the manageability of concrete for construction.
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 application is also impacted by environmental conditions and building requirements. Proper utilization of water-reducing agents can boost the evenness of concrete, decrease concrete breaking, and boost the strength of concrete. The role of water-reducing agents also includes decreasing the water content of concrete, enhancing the strength of concrete, and enhancing the overall performance of concrete. Additionally, water-reducing agents can reduce dust creation, reduce concrete shrinkage, improve concrete longevity, enhance the appearance of concrete, and improve concrete’s capability to corrosion.
What are the features of concrete water-reducing agent?
The concrete water-reducing agent is an admix that decreases the water utilization of concrete while keeping its fluidity basically unchanged, therefore increasing the strength and resilience of concrete, or raising the fluidity of concrete and improving the workability of concrete within the same cement 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 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 ample water-reducing agent is absorbed by the cement particles, with the assistance of 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 functions 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 conditions of moistening have a significant impact on the performance of fresh industrial concrete. The decrease in surface free energy induced by naturally occurring moistening 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 substantially 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%, therefore the name high-efficiency water-reducing agent. The water reduction effect is largely because of the adsorption and diffusion of water-reducing agents in commercial concrete.
4. Plasticizing result.
After adding a water-reducing additive to concrete, it can raise the flow while retaining the water-cement ratio unchanged. Common water-reducing agents, in case of maintaining the specific same quantity of cement, can produce the brand-new industrial concrete depression rise by above 10cm; high-performance water-reducing agents can produce a slump of 25cm of commercial concrete.
Concrete water-reducing agent process of action presented
1. Distributing impact:
After the concrete is combined with water, as a result of the hydration of cement particles, the surface of cement particles creates a dual electrical layer structure, resulting in the formation of a solvent water film and asymmetrical charged surfaces between cement particles creating a bridging effect. This ensures that 10% to 30% of the mix water is enveloped by the concrete particles and cannot take part in free flow and lubrication, thereby impacting the workability of the concrete mix. Whenever the water-reducing substance is added, the water-reducing additive molecules can align themselves and adsorb on the surface of cement particles, creating a comparably charged surface (usually negative) on the cement particles. This causes electrostatic repulsion, encouraging the cement particles to disperse from each other, disrupting the bridging structure, and emitting the enveloped water. As a result, the water can flow more effectively, therefore enhancing the workability of the concrete mix.
2. Lubrication impact:
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 generate a stable layer of solventized water film along with water molecules. This water film offers effective lubrication, substantially decreasing the friction between cement particles and furthermore boosting the fluidity of concrete.
3. Spatial site-resistance impact:
The water-reducing agent structure with hydrophilic branched chains expands in a liquid mixture, developing 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 start to intersect. This results in spatial site-resistance between cement particles, enhancing the repulsion of spatial site-resistance and enhancing the bonding 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, have branched chains implanted onto the molecules of the water-reducing agent. These branched chains provide both spatial site-resistance impacts and, in the highly alkaline environment of cement hydration, can be slowly discharged, causing the release of polycarboxylic acid with scattering effect. This enhances the dissemination effect of cement particles and manages slump loss.
The amount of water-reducing agent is affected by the particle dimension as well as compressive stamina, etc., on the performance of concrete, and additionally its amount is also affected by weather conditions problems and construction demands. The appropriate use of water-reducing agents can boost the uniformity of concrete, reduce the cracking of the concrete, also increase the resilience of concrete. The role of water-reducing agents furthermore consists of decreasing the water substance of concrete, which improves the strength of concrete and makes the general performance of concrete top-quality. In addition, water-reducing agents can also lower the development of dirt, reduce the shrinking of concrete, boost the strength of concrete, boost the appearance of concrete, and enhance the oxidation 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])
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