Aggregate and SCM Alkali Release

This research aims to find a better understanding of how alkalis are released from concrete aggregates and SCMs (mainly fly ash) into the concrete pore solution. This can be accomplished using existing structures information and performing alkali release testing utilizing multiple methods, in particular an electron microprobe analyzer equipped with wavelength dispersive spectroscopy. This testing can provide analytical geochemistry and quantitative microscopy to enhance understanding of how various minerals in concrete aggregates and SCMs release alkalis into concrete pore solution.

For existing Reclamation structures, records have been kept on the materials and proportions used. In this scoping study, a data search has been performed to find relevant structures and information about the initial alkalis present at the time of construction.