Join us for a brief visit to the ICCROM lab where we delve into the art of mortar analysis.
Welcome to today’s episode of “Cooking with ICCROM” - I’m Irene, a conservation architect, and I’m pleased to take you through an insightful journey into mortar analysis right here in the ICCROM lab in Rome.
Today, we’re diving into a fascinating process: The gravimetric Analysis of a mortar sample.
Our goal? The goal of this lab is to estimate the approximate weight proportions and compositions of the main components of a historic mortar: the sand (fine and aggregate) and the binder. Indeed, this method helps us separate sand from the binder, providing us with some crucial information about the mortar’s makeup.
Here’s what we’ll be doing:
- Acid digestion: We’ll start by digesting our mortar sample in an aqueous solution of hydrochloric acid. This process will help us separate the sand (fine and aggregate) from the binder.
- Analyzing aggregates: We’ll examine the characteristics of the sand — its grain distribution, color, shape, and appearance. This tells us a lot about the material’s quality and its origin.
- Identifying additives: By analyzing the sample, we can also detect the presence of any additives such as pigments, fibers, pozzolans or other components that may have been mixed in.
- Determining ratios: We’ll calculate the weight and ratio of the binder to sand. This involves figuring out what materials dissolve during the acid digestion process.
Understanding these aspects enhances our conservation techniques by providing crucial information, particularly when selecting compatible material to match historic mortars. Stay tuned as we uncover the composition of our mortar sample and learn more about how this “simple” technique helps us advance our conservation practices!
Join us as we explore the science behind mortar and enhance our skills in preserving historic materials.
Until next time,
Irene Matteini