Allan Block Muros de Contención 

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Material and Site Checklist

Documento Imprimible (.pdf)

Building a reinforced retaining wall requires advanced planning and careful layout at the job site.

Check Your Materials


  • Cross check the block delivered for color, style and setback, and confirm it matches the AB unit specified on the approved plans.
  • Cross check the geogrid delivered for strength, weight, roll size, strength direction and manufacturer, and confirm it matches the grid specified on the engineered plans.

Delivery and Storage


  • Lay out a storage area for the block, geogrid reinforcement, and wall rock. Store blocks on wood pallets and keep the geogrid dry, covered and clean.
  • Protect the materials from damage or from coming in contact with mud, wet concrete, and other contaminating materials. Damaged material should not be incorporated in the project.
Allan Block

Wall Rock

The proper placement of the wall rock serves several purposes:
  • Locks the block and grid together to form a "Rock-Lock" connection.
  • Increases the overall weight of each AB Unit, increasing structural stability.
  • Facilitates the compaction process in and around the blocks.
  • Prevents settlement directly behind the block, which minimizes additional forces on the grid.
  • Wall Rock can be used for the base material, within the AB Block cavities and behind the block.
  • Wall Rock must be compactible aggregate ranging in size from 0.25 in. to 1.5 in. (6 mm - 38 mm) with no more than 10% passing the #200 sieve with a minimum density of 120 lbs/ft3 (1,923 kg/m3). There needs to be a balanced mix of the sizes to achieve good compaction.
Roca de grava

Backfill Soils


  • On-site soils can be used for backfill around the geogrid reinforcement only if they meet or exceed the design specifications in the approved plans.
  • Heavy expansive clays or organic soils shall not be used in the reinforced zone.
  • Where additional fill is required, the contractor shall submit a sample to the wall design engineer or the on-site soils engineer for compliance with the approved plans.

Foundation Soil Preparation


  • Foundation soil shall be excavated as dimensioned on the plans and compacted to a minimum of 95% of Standard Proctor prior to placement of the base material.
  • Foundation soil shall be examined by the on-site soils engineer to ensure that the actual foundation soil strength meets or exceeds assumed design strength. Soil not meeting the required properties shall be removed and replaced with acceptable material.

Geogrid Layout


  • The geogrid reinforcement design will determine the depth of the reinforced zone and the excavation required. Before construction begins, verify top of wall (TW) and bottom of wall (BW) locations. Check for buried utilities and other obstructions in the reinforced zone.
Refer to the AB Seismic Executive Summary and AB Walls 10 Software for more detailed information. For design assistance contact the AB Engineering Department.

Alzado del muro

Sección Transversal del Muro


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