Evaluation of the Geotechnical Properties of Cubitermes sp and Macrotermes sp Termite Mound Soils for the Manufacture of Earth Bricks

The use of local materials in construction contributes to solving the deficit of sustainable housing in some developing countries. Earth constructions have a low ecological impact and are among the cheapest, especially in rural areas. The durability of earthen buildings depends on the geotechnical properties of the soil used and the respect of basic architectural rules. Evaluation of the geotechnical properties of soils contributes to the choice of the appropriate technique to use them. The macrotermes sp and cubitermes sp termite mound soils are widespread and commonly used in construction in some regions of the world. The results obtained from the 27 samples showed that the clay content of some soils is higher than the maximum permitted of 30% and that other soils have a sand content lower than the minimum of 30% permitted by most standards for the manufacture of mud bricks. Some soils have good molding properties and a plasticity suitable for making mud bricks. To correct excess clay and limit the risk of cracking during drying, lime, plant fibers or sand could be incorporated into these soils. The cubitermes sp termite mound soils are composed of kaolinite and illite and the macrotermes sp termite mound soils of kaolinite, illite and montmorillonite. Soils containing kaolinite or illite are suitable for the manufacture of CEB, adobes, rammed earth and in the manufacture of tiles or pottery.