What was the primary building ingredient of a hang Tu wall section in china?

The primary building ingredient of a Hang Tu wall section in China is rammed earth, which consists of a mixture of soil, sand, and clay. This technique involves compacting the earth within formwork to create sturdy and durable walls. Hang Tu walls are known for their strength and thermal properties, making them effective for both fortification and insulation. This traditional construction method has been used for centuries in various regions of China.