Predicting Nanocrystallites Development in Cement Pastes
نویسندگان
چکیده
منابع مشابه
Structural studies on hydrating cement pastes
The development of the mesoscopic material structure during the hydration of ordinary Portland cement paste is studied by small-angle neutron scattering. Results on the time dependence of radii of gyration (Guinier region) and exponents (Porod region) are given and discussed. Introduction Building materials like hardened cement are heterogeneous. Their useful properties (as strength, porosity, ...
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Loss-on-ignition (LOI) measurements and low temperature calorimetry (LTC) are used to study the properties of hydrating cement pastes with various quantities of alkalis. In addition to the well-known acceleration of early age hydration and ‘‘retardation’’ of later age hydration, the alkalis are observed to have a significant effect on the percolation of the porosity in the hydrating systems, as...
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Although portland cement concrete is the most widely used construction material in the world, efficient simulations for predicting hydration and property development (hardening and aging) are yet to be developed and made widely available to researchers and engineers. Current state-of-theart simulations rely on computationally expensive models to generate spatially resolved time sequences of che...
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Electrode effects on impedance spectra of cement pastes were investigated by two-, three-, and four-point measurements without a potentiostat over the frequency range 0,01 Hz–10 MHz. Electrode immittance effects arising from highly resistive/capacitive contacts cannot be fully corrected by nulling procedures, Two-point~measurements are much more susceptible to such effects than threeor four-poi...
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The formation process of microstructure in cement pastes was first simulated with a numerical model CEMHYD3D. The influence of water-to-cement ratio and particles size on heat release and degree of hydration were then investigated. In addition, the mass of CH and C–S–H phases simulated have been verified by measuring values by thermogravimetry–differential scanning calorimetry (TG-DSC) and X-ra...
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ژورنال
عنوان ژورنال: Open Journal of Civil Engineering
سال: 2018
ISSN: 2164-3164,2164-3172
DOI: 10.4236/ojce.2018.81003