Action mechanism of water reducing agent
Dispersion effect: After mixing cement with Water, due to the hydration effect of cement particles, a double electric layer structure is formed on the surface of the cement particles, forming a solvated water film. Moreover, the surface of the cement particles has anisotropic charges, causing the association between the cement particles, creating a flocculation structure for the cement slurry so that 10% to 30% of the mixing Water is wrapped in the cement particles and cannot participate in free flow and lubrication, Thereby affecting the fluidity of the concrete mixture. After the addition of Water reducing agent, due to the directional adsorption of Water reducing agent molecules on the surface of cement particles, the character of cement particles carries the same electric charge (usually negative electric charge), forming electrostatic repulsion, promoting the mutual dispersion of cement particles, disintegrating the flocculation structure, releasing the wrapped Water, participating in the flow, effectively increasing the fluidity of concrete mixtures. Lubrication: The hydrophilic group in the water-reducing agent has a strong polarity, so the water-reducing agent adsorption film on the surface of the cement particles can form a stable solvated water film with water molecules. This water film has a good lubrication effect and can effectively reduce the sliding resistance between the cement particles, further improving the concrete's fluidity. Spatial steric hindrance: The hydrophilic branched chains in the structure of the water-reducing agent extend in the aqueous solution, forming a hydrophilic three-dimensional adsorption layer with a certain thickness on the surface of the adsorbed cement particles. As the cement particles approach, the adsorption layer begins to overlap, which creates a spatial steric repulsion between the cement particles. The more the overlap, the greater the spatial steric repulsion force and the more significant the hindrance to the cohesion between the cement particles, keeping the concrete slump in good condition. If you are looking for high quality, high purity and cost-effective water reducing agent, or if you require the latest price of water reducing agent, please feel free to email contact mis-asia.