Physical Characterization of Heritage Mortars for Restoration Interventions

The analysis of old mortars is performed for either conservation, repair or the compatible restoration of heritage buildings. It includes experimental analysis of original materials from historic buildings using the non-destructive methods. The methods such as visual investigation, color test, cohesion test and microscopic analysis are considered the most cost-effective methods for determining the composition of heritage mortars. The paper reports the results of an experimental investigation into the physical properties of the cementing materials from the oldest colonial building in South Africa; Castle of Good Hope. The original materials from the Castle were made of lime as a binder, fragments of seashells as additives and soil mortars without a binder. The physical characterization of original heritage mortars gives details of the binder type and the aggregate type which may help to achieve sustainable restoration of ancient buildings.