Abstract
Assessment of influencing parameters
The comprehensive literature survey has been a joint work within the task group “Performance testing” in RILEM TC 219-ACS. 12 authors have contributed to a various extent.
In total, about 250 titles are included in the report reference list. Even more references are included in the various appendices. Our opinion is that all the main parameters of significance for alkali-silica reaction (ASR) performance testing are included in the assessment. Alkali-carbonate reaction (ACR) has not been focused on in this literature survey.
The main focus in the literature survey has been to assess how various parameters may influence the laboratory/field correlation with respect to ASR performance testing, either directly or indirectly.
Parameters of high importance
The review revealed that the following ASR related parameters are of high importance for the outcome of a laboratory performance test, and thus on the laboratory/field correlation:
o Properties of hydration products
o Internal relative humidity
o Temperature
o Aggregate reactivity
o pH of the concrete pore solution
o Properties of reaction products
o Air-content
The report discusses how various laboratory exposure conditions, aggregates types, binder types, mix designs and casting procedures may influence these parameters.
Need for further research
Based on the literature survey and on discussions in the task group “Performance testing” in RILEM TC 219-ACS, issues that need further research are divided into:
o Parameters critical for drafting a performance test procedure set-up
o General parameters, but not critical for the work in the “performance group”