Rammed earth is an earth-moist mixture of clay, silt, sand and gravel, which is rammed into a formwork layer by layer and without any further additives and which dries out in the air after direct stripping.
DEVELOPMENT: Loam is a mixture of clay, sand, silt (very fine sand) and, under certain circumstances, stones. It is mainly formed by weathering, erosion and sedimentation of rocks. Clay is therefore available almost everywhere in the world in different colours and compositions.
HISTORY: Along with wood and stones, clay is one of the oldest building materials of mankind. Even today, more than a third of the world's population lives in buildings that were built partly or entirely of clay, using various techniques. Even in Central Europe, centuries-old buildings are still made of clay, although the building material here was mostly used by poorer societies and almost completely displaced by concrete with the advent of cement.
Photos: Philip Heckhausen