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Neji, M.
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article
Comparison of the chemo-mechanical behavior of low-pH cement exposed to calcareous water and to argillite pore water
Abstract
This paper focuses on the impact of ground water on the chemo-mechanical behavior of low-pH cementitious materials. Two kinds of ground water are considered, calcareous water and argillite pore water. A sample of low-pH cement paste was immersed for two months in each solution. Chemo-mechanical characterizations (SEM, C-14 PMMA autoradiography, nano-indentation) were performed to estimate the degradation state of the samples. Then, geochemical modelling was performed to validate experimental observations. The decalcification of C–S–H, the dissolution of ettringite and a magnesium enrichment are the main phenomena in both cases. However, we observe a larger and deeper increase of porosity when the calcareous water is in contact with the cementitious material. The chemical modifications linked to the increase of porosity tend to locally decrease the mechanical strength of the cementitious matrix.