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This paper describes the air entraining performance of polycarboxylate type water reducer. From the results obtained in this study, it is concluded that Methoxypoly (n=10) ethyleneglycol methacrylate - methacrylic acid copolymer (PC-10) can be purified by utilizing its cloud point; The purified polymer obtained from PC-10 through using its cloud point shows the lower air entraining performance than that of PC-10, and the ingredient that displays the strongest air entraining effect for PC-10 is methoxypoly (n=10) ethylene glycol, which remains in PC-10 as a raw material or an elimination product generated by an alkaline hydrolysis of PC-10 in the cement-water system; In order to decrease the air entraining performance of PC, the side chains of it should be sufficiently hydrophilic: we reached the preliminary conclusion that as the end group of side chains, -H or -CH3 group should be required and the side chains' length should be more than 30 moles in the additional number of ethylene oxide when the end group is -CH3 group.

ON AIR ENTRAINING PERFORMANCE OF POLYCARBOXYLATE TYPE WATER REDUCER