Compressive strength Aggregates Coarse aggregates Concrete aggregates Controlled low strength materials Fine aggregates Paper sludge ash Recycling Waste paper Agglomeration Cements Central composite design Compression testing Concrete industry Concrete mixtures Concretes Construction Industry Construction industry Controlled Low Strength Materials (CLSM) Controlled low-strength material Controlled low-strength materials Design approaches Environmental engineering Environmental problems Flowability Foaming agent High-strength Hydrated lime IBS Industrialized building systems (IBS)