Quick Answer
Ensure the structural integrity of rammed earth walls by using a strong, well-designed formwork system, a well-compacted and stabilized soil mix, and adequate thickness and reinforcement for the walls.
Formwork Design and Construction
A well-designed formwork system is crucial for maintaining the structural integrity of rammed earth walls. The formwork should be sturdy enough to hold the weight of the soil and any additional loads, such as rainwater or snow. A minimum of 2-inch-thick plywood or oriented strand board (OSB) is recommended for the formwork. The formwork should also be designed to allow for the removal of the rammed earth mixture in a controlled manner, without damaging the wall.
Soil Mix Preparation and Compaction
A well-compacted and stabilized soil mix is essential for the structural integrity of rammed earth walls. The soil mix should be composed of a mixture of sand, silt, and clay, with a moisture content of around 10-15%. The mix should be compacted in layers of around 2-3 inches, using a mechanical compactor or a hand tamper. A minimum of 8-10 inches of compacted soil is recommended for the walls.
Thermal Mass and Reinforcement
Rammed earth walls can provide excellent thermal mass, helping to regulate the internal temperature of buildings in desert and arid climates. To enhance thermal mass, the walls can be constructed with a thickness of around 12-18 inches, using a mixture of sand and gravel. Reinforcement can be achieved by incorporating steel rebar or fibers into the soil mix, or by using a combination of both. A minimum of 1% steel rebar or 0.5% fibers is recommended.
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