Accession Number : ADA133909

Title :   Alkali Reactivity of Strained Quartz as a Constituent of Concrete Aggregate.

Descriptive Note : Final rept.,

Corporate Author : ARMY ENGINEER WATERWAYS EXPERIMENT STATION VICKSBURG MS STRUCTURES LAB

Personal Author(s) : Buck,Alan D

PDF Url : ADA133909

Report Date : Aug 1983

Pagination or Media Count : 16

Abstract : 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)

Descriptors :   *Concrete, *Chemical reactions, Internal, Gravel, Quartz, Quartzite, Bases(Chemistry), Alkalinity, Gels, Sodium compounds, Oxides

Subject Categories : Inorganic Chemistry
      Ceramics, Refractories and Glass

Distribution Statement : APPROVED FOR PUBLIC RELEASE