Abstract
The influence of a new comb-shaped polycarboxylate-based superplasticizer (CSSP)on the hydration kinetics and transport properties of aged cement pastes hasbeen investigated by high-resolution quasi-elastic neutron scattering (QENS) andlow temperature differential scanning calorimetry (LT-DSC). A new method ofanalysis of QENS spectra is proposed. By applying the refined method we were ableto access to four independent physical parameters including the self-diffusioncoefficient of the hydration water confined in the cement paste. Mean squareddisplacement (MSD) of the hydrogen atom for mobile water molecules displays a dynamiccrossover temperature in agreement with DSC data. The experimental resultsindicate that CSSP polymer added into cement paste moderates the hydrationprocess and decreases the dynamic crossover temperature of the hydration water.
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