This document specifies the assessment of characteristics for loose-fill expanded clay lightweight aggregate products (hereafter as: expanded clay LWA) intended to be used for application in civil engineering works. This document covers the use of expanded clay LWA as: - lightweight fill and insulation materials in embankments for roads, railways and other trafficked areas; - lightweight backfill for structures. This document specifies procedures for assessment and verification of constancy of performance (AVCP) of characteristics of the expanded clay LWA. This document does not cover the expanded clay LWA: - which are intended to be used as thermal insulation in- and under buildings (already covered in EN 14063-1:2004).