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Wherever organic material has been found encapsulated in the mortar, it has also been analyzed.Further, thanks to dendrochronology it has been possible to establish the origin of the timber for medieval sculptures, and when it was felled.Lime mortar is more porous than cement mortars, and it wicks any dampness in the wall to the surface where it evaporates.Thus any salt content in the water crystallises on the lime, damaging the lime and thus saving the masonry.Earlier researchers have been reasoning intuitively, and the results have been dates varying by several centuries for specific churches. Since the age of the churches has not been known, the use of interdisciplinary scientific methods has had high priority within the project.In this way the churches, together with their decorative fittings, are analyzed by different methods, in various materials.Shell Base filling compound is a type of mortar composed of lime and an aggregate such as sand, mixed with water.
This was then covered with sand and allowed to sit for a while (from days to weeks) - a process known as 'banking'. For this reason, while OPC continues to be commonly used in brick and concrete construction, in the repair and restoration of brick and stone-built structures originally built using lime mortar, the use of OPC has largely been discredited.Despite its enduring utility over many centuries, lime mortar's effectiveness as a building material has not been well understood; time-honoured practices were based on tradition, folklore and trade knowledge, vindicated by the vast number of old buildings that remain standing.When lime mortar is used, the lime is the weaker element, and the mortar cracks in preference to the masonry.
This results in much less damage, and is relatively simple to repair.Usually any dampness in the wall will cause the lime mortar to change colour, indicating the presence of moisture.