Development of an Experimental-Numerical Approach to Model Cement Paste Microstructure Using Quantitative Phase Assemblage from XRD and Thermodynamic Modeling

Krameche, Mohammed; Wilson, William; Tagnit-Hamou, Arezki

doi:10.1007/978-3-031-33211-1_17

Cited by 1 publication

(1 citation statement)

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“…They were then examined directly in a Panalytical X-Pert Pro MPD with a copper kα X-ray source at 40keV and 50mA, a 0.02 mm thick Ni filter, and an RTMS PIXcel1D detector. The scan angle was between 5 and 70°and the step size was 0.0263°for a total of 2474 points of 14 minutes as proposed by Krameche et al [32].…”

Section: X-ray Diffraction (Xrd)mentioning

confidence: 99%

Comparison of curing methods for bulk electrical conductivity testing on cement pastes

BERNARD,

Wilson

2024

Preprint

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Predicting the service life of concrete is one of the main problems faced by civil engineers. Measuring the electrical conductivity of concrete is a promising method to quickly get a qualitative idea of its durability. However, a drawback of bulk conductivity that prevents a quantitative measurement is the effect of the curing method on the measurement. The main phenomenon that occurs during curing and affects the conductivity is the leaching of alkalis from the pore solution into the curing solution. The gradient of alkali concentration between these two solutions creates a driving force for alkali diffusion. The pore solution is therefore less concentrated in alkalis and the pore solution conductivity and the bulk conductivity is reduced. However, previous work has shown that leaching is not the only possible effect of the curing solution on the bulk conductivity. To avoid these effects, the curing solution must simulate the pore solution at each moment of hydration and for each cementitious mix. For this purpose, different curing solutions based on a sacrificial powder, a reduced volume of curing solution and a simulated pore solution are proposed. The aim of this work is to evaluate the effect of these curing solutions and to determine the most suitable one. The results show that a small volume of curing solution is the most promising solution to prevent leaching without affecting the hydration rate.

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Section: X-ray Diffraction (Xrd)mentioning

confidence: 99%