Effects and Mechanism of Amphiphilic Polyether on Shrinkage of Cement Paste
The effects of five kinds of amphiphilic polyether as shrinkage reducing components on the shrinkage deformation of cement paste were tested,and the mechanism of surface tension and micellar particle size distribution on the shrinkage was explored.The results show that diethylene glycol butyl ether,tripropylene glycol methyl ether and polyethylene glycol 400 do not form stable micelles,and the shrinkage reduction effect increases with the decrease of pore solution surface tension.Polyether modified silicone oil has low critical micelle concentration(CMC)and the size of micelle formed is about 30 nm,which affects the spreading of monomer on the surface of capillary solution and refines the pore structure of cement paste,resulting in poor shrinkage reduction effect.Fluorinated polyether has ultra-low surface tension and CMC,which is easy to produce coalescence,so that the effective content of pore solution is extremely low and there is no reduction effect on shrinkage.
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