Mechanism of concrete admixtures

Current naphthalene admixture and admixture of poly-carboxylic acid salts, are relatively high molecular weight (typically 1500~10000) organic compounds belong to the category of surfactant.

Surfactant molecules have polar structure, its end is a non-polar lipophilic groups (or nonpolar hydrophobic groups), and the other end for the polar hydrophilic. Surface active agents dissolved in water, reducing surface tension at the same time, dispersing, wetting, emulsification, foaming, wash and other effects.

1. adsorption and dispersion

Concrete mix liquidity depending on the amount of free water in concrete. After joining the admixtures in concrete, because the surface of cement particles directed molecular adsorption admixture, leading to cement the mutual electrostatic repulsion between particles dispersed. Undermining the structure of cement flocculation, releasing large amounts of free water, greatly increasing the fluidity of concrete mix.

2. wetting

Due to the admixture of orientation of molecules on the surface of cement particles, forming a single molecule solvated water. The water film on the one hand increases the contact area of the cement particles and water, on the other hand has a wetting effect. Therefore, full hydration of the cement, cement strength rising rapidly.

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