Dynamics of Hydration Water in Portland Cement with and without a Superplasticizer Studied by High-Resolution Quasi-Elastic Neutron Scattering

Published

January 25, 2012

Author(s)

Hua Li, Emiliano Fratini, Francesca Ridi, Francesco Bausi, Piero Baglioni, Madhu Sudan Tyagi, Sow-Hsin Chen

Abstract

The influence of a new comb-shaped polycarboxylate-based superplasticizer (CSSP) on the hydration kinetics and transport properties of aged cement pastes has been investigated by high-resolution Quasi-Elastic Neutron Scattering (QENS) and low temperature differential scanning calorimetry (LT-DSC). We propose a new and improved method of analysis of QENS spectra and are able to extract four independent physical parameters including the self-diffusion coefficient of the hydration water. In addition we find a dynamic crossover temperature in hydration water of all the studied aged cement pastes. The experimental results indicate that CSSP polymer added into cement paste moderates the hydration process and has appreciable effects of smoothing out the aging process and of lowering the dynamic crossover temperature of the hydration water.

Citation

Journal of Physical Chemistry B

Volume

24

Pub Type

Journals

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Keywords

water, cement, neutron scattering

Citation

Li, H. , Fratini, E. , Ridi, F. , Bausi, F. , Baglioni, P. , Tyagi, M. and Chen, S. (2012), Dynamics of Hydration Water in Portland Cement with and without a Superplasticizer Studied by High-Resolution Quasi-Elastic Neutron Scattering, Journal of Physical Chemistry B, [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=908014 (Accessed December 26, 2024)