Anode Backfill â Type B1
Anode Backfill – Type B1 DESCRIPTION B1 Backfill is a mix of calcium bentonite and gypsum produced as per AS2239. The backfill surrounds the buried sacrificial anodes to improve the capacity of the anode by reducing electrical resistance.
APPLICATION(S) •
Backfill can either be placed around the anode during installation.
•
The backfill must be well compacted around the anode and dampened down by liberal application of water, before completing the total backfilling of the excavation.
•
Zinc and Magnesium anodes are also available pre-packaged in backfill, using a calico bag. Anodes can be packaged according to AS2239, or to specific requirements. AS2239 required that the cover of backfill needs to be a minimum of 25mm on corners, measured diagonally and a minimum of 50mm cover on the top, bottom and sides.
TECHNICAL INFORMATION Designation B1 Backfill meets the following composition: (a) Calcium Bentonite …… 50% by mass (b) Gypsum ………………. 50% by mass Very little swelling (25%) occurs when wetted from dry state, and minor shrinkage occurs during drying from wet state causing the formation of a minimal number of voids and small cracks. The resistivity of B1 when wet is relatively high – typically 3-6 Ω.m, and it has good water retention.
PO Box 234 Croydon, Victoria, 3136, Australia Phone: + 61 3 9729 8888 Fax: + 61 3 9720 4627 Email: [email protected]
APPLICATION(S) •
Backfill can either be placed around the anode during installation.
•
The backfill must be well compacted around the anode and dampened down by liberal application of water, before completing the total backfilling of the excavation.
•
Zinc and Magnesium anodes are also available pre-packaged in backfill, using a calico bag. Anodes can be packaged according to AS2239, or to specific requirements. AS2239 required that the cover of backfill needs to be a minimum of 25mm on corners, measured diagonally and a minimum of 50mm cover on the top, bottom and sides.
TECHNICAL INFORMATION Designation B1 Backfill meets the following composition: (a) Calcium Bentonite …… 50% by mass (b) Gypsum ………………. 50% by mass Very little swelling (25%) occurs when wetted from dry state, and minor shrinkage occurs during drying from wet state causing the formation of a minimal number of voids and small cracks. The resistivity of B1 when wet is relatively high – typically 3-6 Ω.m, and it has good water retention.
PO Box 234 Croydon, Victoria, 3136, Australia Phone: + 61 3 9729 8888 Fax: + 61 3 9720 4627 Email: [email protected]
