Abstract
Comparative study of Ca-Si gels products of alkali-aggregate reaction in hydraulic concretes and synthetic type gels. Morphological characteristics and chemical compositions of natural Ca-Si gels are determined from samples taken from test cylinders (16 × 32 cm), altered 28 days at 60 °C under 100% H.R.. Synthetic gels which compositions are well known (fixed CaO SiO 2 ratio) are placed under the same conditions of evolution. Using a S.E.M., a comparison between morphological and chemical characteristics of both gels is performed. The main results are: • - after evolution both types of gels show that their CaO SiO 2 ratio values have characteristic values of 0.43 on an average; • - both types of gel show the same domain of variation of their SiO 2 and CaO content; • - under similar conditions, natural and synthetic gels present the same morphological characteristics; • - Na and K do not seem to be incorporated into the structure of natural and synthetic gels. The study of physico-chemical properties of synthetic gels seems to be a good way to understand the formation processes of gels products of alkali-aggregate reactions.
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