Brief description

Rammed earth is a technique for constructing foundations, floors, and walls using natural raw materials such as earth, chalk, lime, or gravel. It is an ancient building method that compresses moist soil mixtures into temporary wooden formwork.

Properties and Characteristics

• Thermal Storage: High density allows walls to absorb heat during the day and release it at night.
• Compressive Strength: When properly compacted and cured, rammed earth structures endure for centuries.
• Fire and Weather Resistance: Non-combustible material with great resistance to environmental weathering.

How it is obtained / Manufactured

1. Soil Selection: Mix suitable soil containing approximately 30% clay and 70% sand or gravel.
2. Moisture Control: Dampen the mixture until it holds together when squeezed without extruding water.
3. Formwork Setup: Construct sturdy wooden or metal forms anchored securely to withstand high lateral compaction forces.
4. Layering & Tamping: Pour the soil mixture in layers about 10–15 cm thick and compact heavily using a pneumatic or manual tamper until dense.
5. Curing: Remove formwork immediately or after initial set, allowing the wall to dry and cure gradually over several weeks.

Applications and Uses

• Wall Construction: Creating structural, load-bearing exterior and interior walls without heavy machinery.
• Thermal Management: Utilizing thermal mass in sustainable building design to regulate internal temperatures.
• Fortifications: Constructing durable barrier walls and foundations resistant to decay.

Related Materials

• Clay
• Gravel
• Sand
• Lime