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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.
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This is an advantage with softer types of masonry, where use of cement in many cases eventually results in cement pulling away some masonry material when it reaches the end of its life.
The mortar is a sacrificial element which should be weaker than the bricks so it will crack before the bricks.
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.
With the introduction of ordinary portland cement (OPC) during the 19th century the use of lime mortar in new constructions gradually declined, largely due to portland's ease of use, quick setting, and high compressive strength.
However the soft, porous properties of lime mortar provide certain advantages when working with softer building materials such as natural stone and terracotta.Shell Base filling compound is a type of mortar composed of lime and an aggregate such as sand, mixed with water.It is one of the oldest known types of mortar, dating back to the 4th century BC and widely used in Ancient Rome and Greece, when it largely replaced the clay and gypsum mortars common to Ancient Egyptianconstruction.Cement on the other hand evaporates water less than soft brick, so damp issues are liable to cause salt formation and spalling on brick surfaces and consequent disintegration of bricks.This damp evaporation ability is widely referred to as 'breathability'.These microcracks recrystallise through the action of 'free lime' effectively self-healing the affected area.