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Qualificazione di aggiunte minerali per la prevenzione della reazione espansiva alcali-silice in conglomerati cementizi

pubblicazioni - Articolo

Qualificazione di aggiunte minerali per la prevenzione della reazione espansiva alcali-silice in conglomerati cementizi

Recently updated on Maggio 11th, 2021 at 09:07 am

The effectiveness of four different types of supplementary cementing materials (condensed silica fume, coal fly ash, blast furnace slag, and natural pozzolan) (SCMs) in preventing deleterious expansion due to alkali-silica reaction (ASR) was assessed using the ASTM C1260 mortar-bar expansion test and two siliceous aggregates of different alkali-reactivity. The test results were interpreted on the basis of both a percent expansion criterion and a kinetic parameter, ln k, the latter being derived from the correlation of expansion results with a kinetic equation. It was found that the kinetic parameter, ln k, is a suitable judgement criterion for the qualification of SCMs against ASR. A good correspondence between the effective dose levels of SCMs determined with such a kinetic parameter and a percent expansion criterion is obtained, especially if the 14-day expansion limit of 0.15% instead of 0.10% is used to interpret the ASTM C1260 test results.

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