Is there a specific curing process for rammed earth in humid climates?

Controlling Moisture Levels

To mitigate the effects of high humidity, construction teams must closely monitor moisture levels within the rammed earth walls. This can be achieved by incorporating a desiccant-rich soil mix, which absorbs excess moisture and reduces the risk of efflorescence. The ideal mix composition includes 10% to 20% desiccant materials such as bentonite clay or silica sand. A maximum moisture content of 10% is recommended to ensure optimal curing and strength development.

Formwork and Drainage

In humid climates, the formwork used for rammed earth construction plays a crucial role in controlling moisture levels and promoting a faster curing process. A well-designed formwork system should include a drainage system to prevent moisture from accumulating within the walls. This can be achieved by incorporating a 1:4 slope and using a drainage material such as gravel or aggregate. A minimum of 2 cm of drainage material should be used to ensure effective moisture removal.

Thermal Mass and Insulation

To counteract the effects of high humidity, rammed earth walls in humid climates should incorporate a thermal mass component to regulate internal temperatures and reduce moisture accumulation. This can be achieved by using a combination of insulation materials such as vermiculite or perlite and a thermal mass component like concrete or brick. A minimum of 10 cm of insulation should be used to ensure optimal thermal performance. Additionally, a water-repellent coating can be applied to the exterior of the walls to prevent moisture penetration.