Synthesis, working mechanism and effectiveness of a novel cycloaliphatic superplasticizer for concrete

摘要

In this study, the synthesis, performance and mode of action of a new type of superplasticizer is presented. From cyclohexanone, formaldehyde and sulflte, a high molecular weight polycondensate (M_w~ 220,000 g/mol) was synthesized. The resulting CFS superplasticizer was characterized by size exclusion chromatography and anionic charge density measurement Performance of CFS in cement was probed by mini slump test and by determining the maximum water reduction achievable. The working mechanism was identified via adsorption and zeta potential measurements. The results show that CFS behaves like a typical polycondensate superplasticizer such as BNS. It enhances the fluidity of cement due to electrostatic repulsion. Advantages of this novel type of superplasticizer are simple preparation method, effectiveness at low water-to-cement ratio, huge water reducing capability and stable performance in the presence of clay.