What is a Concrete Water-Reducing Agent?
Water reducing agent is an essential part of concrete blends. It boosts the consistency of concrete, rendering it easier to blend and pour, thus improving the flexibility of concrete for building.
The quantity of water-reducing additive is impacted by factors like particle size and compressive strength, among others, with regards to the performance of concrete, and its quantity is also influenced by the environmental conditions and construction requirements. Proper utilization of water-reducing agents can enhance the consistency of concrete, decrease concrete cracking, and improve the strength of concrete. The role of water-reducing agents also includes reducing the water content of concrete, enhancing the robustness of concrete, and enhancing the overall performance of concrete. Additionally, water-reducing agents can reduce dust formation, lessen concrete shrinkage, improve concrete longevity, improve the appearance of concrete, and improve concrete’s resistance to corrosion.
What are the features of concrete water-reducing agent?
The concrete water-reducing agent is an mixture that reduces the water utilization of concrete while keeping its fluidity fundamentally unchanged, thus enhancing the strength and resilience of concrete, or raising the fluidity of concrete and enhancing the workability of concrete under 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 readily 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 ample water-reducing agent is absorbed by the cement particles, using R-SO3θ and the hydrogen bonding in water molecules, as well as the hydrogen bonding between water molecules, a stable solvated water film creates on the surface of cement particles. This layer functions as a three-dimensional protective layer, 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 moistening have a significant impact on the performance of fresh industrial concrete. The decrease in surface available energy induced by natural moistening can be computed using the formula suggested by Glbbs.
3. Fluidity-enhancing effect.
After the addition of high-efficiency water-reducing agents in industrial concrete, the water-cement ratio can be substantially 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%, hence 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 case of maintaining the precise same quantity of cement, can make the brand-new industrial concrete depression rise by over 10cm; high-performance water-reducing agents can create a slump of 25cm of industrial concrete.
Concrete water-reducing agent system of action presented
1. Distributing effect:
After the concrete is combined with water, because of the hydration of cement particles, the surface of cement particles forms a dual electrical layer structure, causing the development of a solvent water film and nonuniform charged surfaces between cement particles making a bridging effect. This guarantees that 10% to 30% of the mix water is covered by the concrete particles and cannot take part in free flow and lubrication, consequently affecting the flow of the concrete mix. As the water-reducing additive is added, the water-reducing substance molecules can align themselves and adsorb on the surface of cement particles, creating a similarly charged surface (normally negative) on the cement particles. This induces electrostatic repulsion, urging the cement particles to disperse from each other, disintegrating the bridging structure, and releasing the covered water. As a result, the water can flow more efficiently, therefore enhancing the fluidity of the concrete mix.
2. Lubrication impact:
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 create a stable layer of solventized water film through with water molecules. This water film offers effective lubrication, significantly lowering the resistance between cement particles and furthermore boosting the workability of concrete.
3. Spatial site-resistance effect:
The water-reducing agent structure with hydrophilic branched chains stretches in a liquid mixture, creating a compact hydrophilic three-dimensional adsorption layer on the surface of adsorbed cement particles. When the concrete particles are adjacent to each other, the adsorption layers start to overlap. This causes in spatial site-resistance among cement particles, raising the repulsion of spatial site-resistance and improving the adhesion blockage between cement particles, therefore 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 branching chains implanted onto the molecules of the water-reducing additive. These branched chains provide both spatial site-resistance impacts and, in the highly alkaline environment of cement hydration, can be slowly discharged, resulting in the discharge of polycarboxylic acid with scattering impact. This boosts the dissemination effect of cement particles and controls slump loss.
The volume of water-reducing agent is impacted by the particulate measurement as well as compressive endurance, etc., on the performance of concrete, and furthermore its volume is likewise affected by weather problems and construction needs. The proper use of water-reducing agents can enhance the uniformity of concrete, lower the cracking of the concrete, similarly elevate the toughness of concrete. The role of water-reducing agents furthermore consists of reducing the water substance of concrete, which increases the strength of concrete and makes the general performance of concrete premium. Additionally, water-reducing agents can similarly decrease the development of dirt, decrease the shrinking of concrete, increase the sturdiness of concrete, boost the look of concrete, and improve the rust resistance of concrete.
Concrete Water-Reducing Vendor
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