Light weight broken AAC blocks are also called as AAC Rubble. AAC broken blocks are best alternative to Light Weight Cinder, Coal Lumps, Burnt Tar Lumps and other filling materials. Being normally cured cement based product, it continues to gain strength with time so long as some moisture is available in the environment, requiring little maintenance. This is unlike other filling materials like coal which deteriorate with time. AAC Rubble is best alternative to: LIGHT WEIGHT CINDER BROKEN RED CLAY BRICKS BROKEN FLY ASH BRICKS COAL LUMPS BURNT TAR LUMPS "Rubble Light weight broken AAC blocks are also called as AAC Rubble. AAC broken blocks are best alternative to Light Weight Cinder, Coal Lumps, Burnt Tar Lumps and other filling materials. Being normally cured cement based product, it continues to gain strength with time so long as some moisture is available in the environment, requiring little maintenance. This is unlike other filling materials like coal which deteriorate with time."