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Why is eca or expanded clay aggregate preferred for passive impact protection systems ?

Why is eca or expanded clay aggregate preferred for passive impact protection systems ?

Loose Expanded Clay Aggregate has unique properties that make it a good choice for passive impact protection systems. Due to its low specific weight and the deformable nature of ECA ® granules, it is much more effective for the mitigation of sudden shocks, compared to other heavier materials like gravel.

It can be used for boulder landing beds on protected roads, for escape lanes on long, steep road descents where trucks or cars may need to come to a stop safely and dissipate kinetic energy, and on car and motorcycle racing circuits, to help reduce the speed of vehicles in dangerous areas.

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