Abstract: “In this study, the effect of anionic functional group change of polycarboxylate-ether based water reducing admixture on some fresh state properties and compressive strength of the cement paste and mortar mixtures was investigated. For this purpose, in addition to the control admixture having 100% of carboxylate as anionic functional group, four different types of admixture were synthesized by replacing 10 and 30 mol% of anionic functional group with sulfonate and phosphate functional groups. In all admixtures anionic/non-ionic group ratios, free non-ionic group contents, molecular weights, main chain and side chain lengths were kept constant. In all mixtures CEMI 42.5R type cement were used as binder. In mortar mixtures water/cement ratio, sand/binder ratio and slump-flow values were kept constant as 0.485, 2.75 and 270±20 mm, respectively. According to the test results, flow time of the paste and mortar mixtures did not significantly change by substitution of carboxylate anion functi”

Keywords: water reducing admixture, sulfonate functional group, phosphate functional group, cement paste, mortar