1. Assessment Gravel Aggregate Reactivity With Alkalis In Relation To Methods Of Test
- Author
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Zdzisława Owsiak, Justyna Zapała-Sławeta, and Przemysław Czapik
- Subjects
Aggregate (composite) ,Chemistry ,Scanning electron microscope ,Alkali metal ,petrography ,chemistry.chemical_compound ,aggregate ,alkali-silica reaction ,Chemical engineering ,lcsh:TA1-2040 ,Sodium hydroxide ,mortar ,Alkali–silica reaction ,Chemical test ,Geotechnical engineering ,Reactivity (chemistry) ,Mortar ,lcsh:Engineering (General). Civil engineering (General) ,Civil and Structural Engineering - Abstract
Alkali-aggregate reactivity (AAR) is one of the major causes of damage in concrete. Potential susceptibility of aggregates to this reaction can be determined using several methods. This study compares gravel alkali reactivity results obtained from different tests conducted on coarse aggregates with complex petrography. The potential for the reactivity in the aggregates was revealed in the chemical test using treatment with sodium hydroxide. Optical microscopy, scanning electron microscopy and X-ray diffraction were used to identify the reactive constituents. The expansion measured in the mortar bars test confirmed that the aggregate was potentially capable of alkali silica reactivity with consequent deleterious effect on concrete.
- Published
- 2014