Characterization of the mineralogical components of gravels and sands with influence on the alkali-silica reaction, using mortar-bars test.
Keywords:
alkali-silica reaction, expansions, mortars, reactive mineralsAbstract
The alkali-aggregate reaction, in its alkali-silica variant, has various minerals that influence the reactivity and little is known about its expansive behavior when mixed with the chemical components of Portland cement; therefore, it was sought to characterize its expansive behavior over time, up to 120 days and to analyze the causative effects in mortars when there is a unit presence of reactive minerals or combinations of them; such that, these reactive minerals are present in aggregates (gravels and sands) from banks of river materials (natural pebbles) or hill (processed by crushing) located in the State of Chihuahua, Mexico. The characterization was performed by measuring longitudinal expansions with the mortar bar test method (ASTM C-1260 Standard); where the results show that the minerals of chalcedony, quartz and opal, alone or in combination, are the ones that develop the greatest deleterious expansions at early ages in mortars.
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