Abstract
The effects of chemical structures of graft copolymer on cement-dispersing performance were investigated in order to elucidate the fluidizing mechanism of polycarboxylate-based superplasticizer containing polyethylene oxide graft chains. Graft copolymer having longer graft chains showed better dispersing stability at small amount of adsorption. Moreover, the adsorption study indicated that the graft chains were stretched as increasing the adsorption density. From the experimental result of the extension for graft chains, the interparticle interaction according to the steric hindrance theory can be explained the effect of length of graft chains on cement-dispersing ability and thus we proposed the modified steric stability model.
