Rilem tc 167-COM:: Characterization of old mortars -: Quantitative analysis of historical mortars using optical microscopy

As a part of the activities of the RILEM TC 167-COM committee two methods of quantitative microscopy have been developed for analysing historical mortars. This paper gives background information for the application of these methods. The methods concern the determination of mix proportions and aggregate size distribution using microscopical methods. A method is also described for correcting determinations of mix proportions based on chemical analysis of acid-soluble calcium oxide for the presence of carbonate in the aggregate.