Rammed earth precast is a construction technique that involves precasting panels made of rammed earth, a natural building material that has been used for centuries. Rammed earth is made by mixing soil, gravel, sand, and clay with water and then compacting the mixture into a formwork using manual tools. The result is a solid, durable, and environmentally friendly material that can be used for a variety of construction purposes.

Rammed earth precast panels are made by constructing a formwork that is the exact shape and size of the panel to be cast. 

Rammed earth precast panels offer several advantages over traditional rammed earth construction methods. Firstly, they can be produced in a controlled environment, which ensures consistent quality and reduces the risk of weather-related delays during construction. Secondly, precast panels can be transported to the construction site, which reduces the amount of on-site work required and minimizes disruption to the site. Finally, precast panels can be used to create complex shapes and designs that would be difficult to achieve using traditional rammed earth methods.

Rammed earth precast panels are also an environmentally friendly option for construction. The materials used to make rammed earth are abundant and locally available, which reduces transportation costs and carbon emissions. Additionally, rammed earth has excellent thermal mass properties, which means that it can help to regulate indoor temperatures and reduce the need for heating and cooling.

In summary, rammed earth precast is a construction technique that involves precasting panels made of rammed earth. This technique offers several advantages over traditional rammed earth methods, including consistent quality, reduced on-site work, and the ability to create complex shapes and designs. Additionally, rammed earth precast is an environmentally friendly option that uses locally available materials and has excellent thermal mass properties.