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- W2366133670 abstract "Sulfonated acetone-formaldehyde polycondensate(SAF) was fractioned by ultrafitration into four fractions with the molecular weight range of 2 500,2 500～10 000,10 000～50 000 and 50 000.Structural analysis showed the average molecular weight and the intrinsic viscosity of the four fractions successively increased while their sulfonation degree decreased.Meanwhile,properties of SAF fractions with different molecular weights as the water reducer of cement were investigated.Results showed with the increase of molecular weight of SAF fractions,the water-reducing ratio of cement paste containing SAF fractions increased significantly,but the paste tended to lose fluidity easier with the time-lapse.The retardation effect of SAF fractions decreased because the content of sulfonic groups,hydroxyl reducer and the complexation of these two groups to calcium ion was weakened.The 7 d and 28 d compressive strength of the harden mortar added SAF fractions were enhanced by 30%～60% in contrast with the reference and the strength increased as the molecular weight of SAF fractions increased.The two fractions of higher molecular weight had the dosage and water-amount sensitivity,and when their dosage was above 0.3%(ratio of mass of SAF to cement),the mortar became bleeding.It thus decreased the compressive strength." @default.
- W2366133670 created "2016-06-24" @default.
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- W2366133670 date "2010-01-01" @default.
- W2366133670 modified "2023-09-26" @default.
- W2366133670 title "Influence of Molecular Weight of Sulfonated Acetone-Formaldehyde Polycondensate on Its Dispersing Performance" @default.
- W2366133670 hasPublicationYear "2010" @default.
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