Synthesis, properties and dispersion mechanism of sulphonated acetone-formaldehyde superplasticizer in cementitious system

Abstract

The synthesis, properties and dispersion mechanism of sulphonated acetone-formaldehyde superplasticizer (SAF) were presented. This superplasticizer was synthesized by the reaction among acetone, formaldehyde, sodium sulfi te and pyrosulfite. The structure and property were respectively characterized by IR and surface tension measurement. Performance of SAF in cement was evaluated by paste flow as well as heat calorimetry. The dispersion mechanism was identifi ed via adsorption and zeta potential measurement. The results show that cement paste mixed with SAF shows good fl uidity. SAF exerts little retarding effect on cement paste and it behaves like a typical polycondensate superplasticizer. The main dispersion mechanism of SAF is attributed to electrostatic repulsion.

Keywords

sulphonated acetone-formaldehyde superplasticizer / dispersion mechanism / zeta potential / cement paste

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