Effect of early-strength polycarboxylate superplasticizer on early hydration of tricalcium silicate
To delve into the mechanism of early-strength polycarboxylate superplasticizer(ES-PCE)on the early hydration of tricalcium silicate(C3S),a comprehensive characterization of the dissolution rate of C3S,hydration heat release,and morphological evolution of hydration products was conducted to shed light on the intricate mechanisms underlying the influence of ES-PCE on the early hydration of C3S.The results showed that the introduction of ES-PCE played a certain role in inhibiting the dissolution of C3S.It presented a weak delay effect on the induction period and the main exothermic peak by ES-PCE.It also delayed the growth of C-S-H crystals in the early stages,but a significant increase in the number of C-S-H crystals occurs during the deceleration phase.Due to the complexation of carboxyl groups with Ca2+,lots of Ca2+in the pore solution could be trapped by ES-PCE forming a Ca2+-rich surface,which was conducive to the attraction of SiO32-and the nucleation of C-S-H gel,thus making the growth of C-S-H more intensive.
early-strength polycarboxylate superplasticizertricalcium silicatedissolutionnucleationand growth of C-S-Hhydration
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