Microstructural simulation and measurement of elastic modulus evolution of hydrating 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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Quasi-elastic neutron scattering (QENS) was used to monitor the state of water in portland cement and tricalcium silicate pastes during the first 2 days of hydration at three different temperatures. By applying a double-Lorentzian rather than a single-Lorentzian fitting function, the QENS signal from water at a given hydration time was divided into three separate populations arising from liquid...
متن کاملMicrostructural aspects of cement hydration – ultrasonic waves and numerical simulation
In this paper, an ultrasonic shear wave reflection method was adopted to mimic the microstructural evolution of hydrating Portland cement pastes with different water/cement-ratios (0.35, 0.5 and 0.6) cured under a constant temperature of 25°C. The reflection coefficient measured with this technique was correlated to microstructural parameters of the cement pastes. The application of numerical s...
متن کاملTransient plane source measurements of the thermal properties of hydrating cement pastes
A transient plane source measurement technique is applied to assessing the heat capacity and thermal conductivity of hydrating cement pastes in their fresh state and during the course of 28 d of hydration at 20 C. Variables investigated include water-to-cement mass ratio (w/c – 0.3 or 0.4) and curing conditions (sealed or saturated curing). The heat capacity data for the fresh cement pastes are...
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ژورنال
عنوان ژورنال: Cement and Concrete Research
سال: 2020
ISSN: 0008-8846
DOI: 10.1016/j.cemconres.2020.106007