Journal
CONSTRUCTION AND BUILDING MATERIALS
Volume 411, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.conbuildmat.2023.134285
Keywords
Alkali -Aggregate Reaction; Concrete degradation; Expansion tests; Threshold values for ASR
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This paper proposes more robust approaches to define alkali content or concentration thresholds for longer time scales. The derived threshold values are compared with literature values and civil engineering standards.
To prevent ASR, standards exist to determine safe alkali content levels for typical civil engineering timespans. However, these standards can be misapplied to different applications or timeframes. Other standards define tests, to assess the alkali-sensitivity of granulates by means of expansions tests. These expansion tests might be used to set ad-hoc alkali thresholds, but the reliability in such cases is not assessed. This paper proposes more robust approaches. These approaches are used to define alkali content or concentration thresholds for longer time scales. These newly derived threshold values are then compared with literature values. Additionally it is verified how these values compare to civil engineering standards.
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