Farid Benboudjema, Jean-Michel Torrenti
A simplified model for calcium leaching in concrete is presented. It is based on the mass balance equation for calcium in the porous material. This model is implemented in a Finite Volume code and validated by comparison between numerical simulations and experimental results found in the literature, for cement pastes and mortars as well as for concretes, with a satisfactory agreement. Then, a parametric survey has been performed. It enlightens the large influence of porosity and diffusivity on the leaching kinetic. In complement, a large experimental campaign, which aims at acquiring data on the material characteristics variability (within several batches for a same concrete mix design) has been undertaken. This campaign investigates porosity and the degradation depth at different times considering accelerated leaching under variable temperature. Nevertheless, the coefficient of tortuosity (which partially controls diffusivity in concrete) cannot be directly measured, although it is an important parameter to model the calcium diffusion process. Therefore, an inverse identification tool is developed and validated, based upon the Artificial Neural Network theory, using the available experimental solid calcium concentration data.
@article{ab0d0757-7096-4345-8b5c-9a07a96bc044,
title={Concrete calcium leaching at variable te},
author={Farid Benboudjema and Jean-Michel Torrenti},
year={2026},
language={en}
}TY - JOUR TI - Concrete calcium leaching at variable te AU - Farid Benboudjema AU - Jean-Michel Torrenti PY - 2026 LA - en ER -
The leachability tests for manufacturing scrap TV boards (STVB) have indicated the release of metals beyond the limit levels with potential problems f
Printed circuit boards (PCBs) from electronic gadgets at the end of their useful life period are currently being dumped in landfills or incinerated, c
C.N. Mpinga, J.J. Eksteen
Platinum Group Metals (PGMs), often with associated gold, have very few occurrences where they are present in an ore deposit at economically extractab
Introduction Concerns over air pollution and the environmental problem of acid rain have made governments all over the world tighten their regulations
This paper addresses the challenge of assessing the feasibility of wind power plant projects at sites with insufficient or no local historic wind data