Qiang Liu;Hongxia Guo;Ziming Wang;Suping Cui;
<正>The performances of the polycarboxylate(PC) based superplasticizer compounded with sulfonated cyclohexanone-formaldehyde resin(SCF) were investigated in this work.The surface tension of the mixed polymer solution,fluidity of cement paste and the water-reduction ratio were researched.The results showed that PC and SCF can be completely miscible,and the surface tension reduced from 61.0 dyn/cm to 59.9 dyn/cm with the addition of SCF in PC from 5%to 50%.When the proportion of SCF in the composite superplasticizer was less 10wt%.the fluidity and the water reduction ratio of the composite superplasticizer showed little change at the dosage of 0.25%, compared with that of the pure polycarboxylate superplasticizer.Further increase of SCF in the composite superplasticizer resulted evident reduction in performances.So the suitable replacement ratio of SCF in the composite superplasticizer should not exceed 10wt%.
polycarboxylate superplasticizer;;sulfonated cyclohexanone-formaldehyde resin;;the fluidity of cement paste;;water reduction ratio
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