Concrete superplasticizer is a kind of concrete admixture, in the case of maintaining the fluidity of concrete unchanged after adding, the concrete water demand is reduced, and then enhance the strength and durability of concrete, or in the cement usage and water cement ratio has not changed, improve the fluidity of concrete, improve the construction of concrete.
1. Lubrication effect. The polar hydrophilic groups in the water reducing agent are adsorbed on the surface of cement particles and easily associate with water molecules in the form of hydrogen bond. The force of hydrogen bonding far exceeds the molecular attraction between water molecules and cement particles. When sufficient water reducing agent, cement particle adsorption with R - SO3 theta and the effect of water molecules in the hydrogen bond association, and the hydrogen bonding between water molecules associating, line surface of cement particles into a stable layer of solvation water membrane, the membrane with the three-dimensional protection, stop the direct contact between the cement particles, and lubricating effect between particles.
2. Wetting effect. After cement is mixed with water, the surface layer of cement particles is wetted by water, and its wetting condition has a great influence on the characteristics of freshly mixed concrete. When such diffusion wetting occurs naturally, the amount of reduced surface free energy can be calculated by the equation pointed out by Glbbs.
3. Reducing water effect. The water cement ratio can be reduced obviously under the condition of maintaining the fluidity after adding concrete superplasticizer. Concrete superplasticizer can reduce water rate of 10% ~ 25%, and ordinary water reducing agent of 5% ~ 15%, high efficiency water reducing agent is also famous for this. The main reason for the water reducing effect is the absorption and dispersion of water reducing agent of commercial concrete.
4. Plasticizing effect. After adding water reducing agent into the concrete, the fluidity can be added under the condition of maintaining the water cement ratio unchanged. Normally water reducing agent in maintaining cement usage did not change the situation, so that the new mix of commodity concrete slump increases 10 centimeters above, efficient water reducing agent can configure a slump to reach 25 centimeters of commodity concrete.
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