Alkali Reactivity of Strained Quartz as a Constituent of Concrete Aggregate.
ARMY ENGINEER WATERWAYS EXPERIMENT STATION VICKSBURG MS STRUCTURES LAB
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Some strained quartz may cause deleterious alkali-silica reaction if present as a constituent of concrete aggregate in sufficient amounts. The criterion for reactive strained quartz is suggested to be more than 20 percent strained quartz with an average undulatory extinction angle greater than 15 degrees. Length changes of mortar bars containing such strained quartz will be 0.025 and 0.040 percent or more at 6 and 12 months, respectively, when stored at a temperature of 60 C 140 F. Revisions to applicable ASTM standards may be appropriate. Author
- Inorganic Chemistry
- Ceramics, Refractories and Glass