Beyond Traditional Plasticizers: The Polycarboxylic Acid Advantage Engineering Stronger Concrete: The Science of Polycarboxylic Water Reducers

The mechanism of water-reducing agent

　　(1) Dispersing effect

　　After mixing cement with water, the cement paste forms a flocculent structure; 10% ~ 30% of the mixing water is wrapped in the cement particles and can not participate in the free flow and lubrication, thus affecting the fluidity of the concrete mix. When adding water water-reducing agent, water-reducing agent molecules can be directed adsorption on the surface of cement particles so that the surface of cement particles with the same kind of charge (usually negative charge), the formation of electrostatic repulsion, prompting the cement particles are dispersed each other, flocculation structure disintegration, the release of the wrapped portion of the water so that it can participate in the flow, thus increasing the fluidity of the concrete mix.

　　(2) Lubrication

　　Water reducing agent in the hydrophilic group polarity is very strong, water reducing agent adsorption film on the surface of cement particles and water molecules to form a stable solvent water film; this layer of water film has a very good lubricating effect can effectively reduce the sliding resistance between the cement particles, so that the concrete fluidity is further improved.

　　(3) Spatial resistance

　　Hydrophilic branch chain in the structure of water reducing agent, stretching in the aqueous solution, in the adsorption of cement particles on the surface to form a certain thickness of hydrophilic three-dimensional adsorption layer. When the cement particles are close, the adsorption layer starts to overlap; that is to say, it produces spatial resistance between the cement particles; the more overlap, the greater the spatial resistance repulsion, and the greater the obstruction to the cohesion between the cement particles, so as to make the concrete maintain a good slump.

　　(4) Slow-release effect of graft copolymerization chain

　　A new type of water-reducing agents, such as polycarboxylic acid water-reducing agent in the preparation process, in the water-reducing agent molecular grafting some branch chain, the branch chain can not only provide spatial site resistance effect, and in the high alkalinity environment of cement hydration, the branch chain can be slowly cut off, releasing polycarboxylic acid with dispersing effect, so as to improve the dispersion of the cement particles and control the slump loss.

Supplier

Cabr-Concrete is a supplier under TRUNNANO of Concrete Admixture with over 12 years of experience in nano-building energy conservation and nanotechnology development. It accepts 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. If you are looking for Concrete Water Reducers, please feel free to contact us and send an inquiry. (sales1@cabr-concrete.com)