Dispersibility and air entraining performance of polycarboxylate-type water reducers

作者：Li, Shun; Wen, Ziyun^*

来源：Journal of the Chinese Ceramic Society, 2009, 37(4): 616-621.

• Dispersibilities
• Distribution
• Free radical copolymerization
• High molecular mass
• Molecular mass and its distribution
• Orthogonal test
• Polycarboxylate type water reducers
• Saturation dosages

A series of polycarboxylate-type water reducers (PCWRs) were synthesized by free radical copolymerization. Effects of type and ratio of the functional group, initiator and chain transfer on the dispersibility of the PCWRs in cement grout were investigated by using an orthogonal test. The PCWR with a low air entraining capability and a high dispersibility was synthesized by optimizing the functional group ratio and adjusting the molecular mass. The effects of the functional group ratio and the molecular mass on the air entraining performance of the PCWR were analyzed. The relationships among the molecular mass and its distribution and the dispersibility, as well as the saturation dosage of the PCWRs were discussed. The results show that. The strengthened air entraining capability of the PCWR with the appropriate functional group ratio results from the excessively high molecular mass. When the molecular mass is excessively high, the dispersibility of the PCWR in the cement paste is low, but its saturation dosage in cement mortar is high.

• 出版日期2009-4
• 单位华南理工大学