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Why does one use eca or expanded clay aggregate for lightweight fill for underground structures ?

Why does one use eca or expanded clay aggregate for lightweight fill for underground structures ?

ECA ® (Expanded Clay Aggregate) is a perfect material for lightweight fill material when creating underground structures. It offers an extremely high strength-to-weight ratio, due to its unique construction, with thousands of tiny holes and pores throughout the structure of the clay.

In addition, ECA ® is very strong and noncompressible, and will not deform under load. It’s also a highly-efficient insulator, with a low thermal conductivity coefficient. Since it’s lightweight, it’s also inexpensive to transport, which can help keep costs low for your project. It can even be combined with other fill materials, such as concrete while maintaining its unique properties.

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