Cracks are not uncommon in earth construction

Cracks aren’t uncommon in earth construction.
In cob construction, the walls have a tendency to crack due to several factors such as
-unequal drying
-improper shading
-direct exposure to sunlight or rain
-proportions of sand and clay
-consistency of the mix
-air temperature and humidity
The are two types of cracks- surface and structural and when structural cracks
occur,there is a need to be worried about.
-The cracks are covered with wet sacks which are to be maintained damp
-Rectangular boxes are chiselled on the cracks and filled with a mixture of earth,
lime and fermented jaggery solution with straws and human hair for added strength
-Small bricks are made out with the help of the formwork
-The bricks are filled in the cracks and left to dry while being covered with wet sacks
Another method we tried when some of the repaired cracks started to crack again was,
making 2.5cm deep holes in the chiselled cracks after a course is done and fitting in
calatropis for reinforcement after which the second course is laid in the cracks.

2 Replies to “Cracks are not uncommon in earth construction”

  1. They are commonly known as milkweeds because of the latex they produce. Calotropis species are considered common weeds in some parts of the world.The milk produced from the plant is poisonous and the stems of the plant used as reinforcement in crack repair which has good tensile strength.

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