September 20, 2018

Best Practices for Zero Retaining Wall Failures - Compaction Requirements at the Face of Wall


Compacting the wall rock behind your retaining wall, as well as inside the cores of the facing units is key.
Allan Block recommends that a hand operated plate compactor be used behind the base course within the 3 ft (0.9 m) wide consolidation zone with a minimum of two passes.

Compaction of the second course and above begins by running the plate compactor directly on top of the block facing and then compacting in parallel paths from the wall face until the entire consolidation zone has been compacted. A minimum of two passes of the plate compactor are required with maximum lifts of 8 in. (20 cm).

Final compaction requirements are typically 95% of Standard Proctor.For more information, see Sec. 1 Part 3.4 E in the Allan Block Spec Book.    (ref. BP, Chapter 6.7)

Allan Block is working to achieve our industry initiative of Zero Wall Failures. With our Best Practices Manual and experience in the industry we are trying to expand the knowledge base for the design of segmental retaining walls (SRW's) by communicating and educating the professionals in the industry.  To see the full Best Practices Manual, visit allanblock.com to download today and keep an eye out for more industry Best Practice recommendations here.






September 18, 2018

Best Practices for Zero Retaining Wall Failures - Inspection and Testing Recommendations


With any retaining wall project, inspection and testing requirements should be established before providing a design. An independent testing firm should be hired by the owner to provide these services.
The size and scope of a project will determine the levels of testing and inspection, and testing frequency should be set to establish a proper compaction protocol.  

Typically, the following testing frequency should be followed:
One test for every 8 in (20 cm) of vertical fill placed and compacted, for every 25 lineal ft (7.6 m) of retaining wall length, starting on the first course of block.

Compaction test locations should vary to cover the entire area of the reinforced zone, and slopes above the wall should be compacted and checked in a similar manner.  (ref. BP, Chapter 6.6)

Allan Block is working to achieve our industry initiative of Zero Wall Failures. With our Best Practices Manual and experience in the industry we are trying to expand the knowledge base for the design of segmental retaining walls (SRW's) by communicating and educating the professionals in the industry.  To see the full Best Practices Manual, visit allanblock.com to download today and keep an eye out for more industry Best Practice recommendations here.

September 13, 2018

Best Practices for Zero Retaining Wall Failures - Soil Parameter Verification


Before constructing your Allan Block wall, the on-site soils engineer must verify and document that soils meet characteristics specified in the soils report and wall design.

Soil types vary tremendously in their response to water and effects on retaining walls.  Minimum infill soils need to meet requirements outlined in Section 1 Part 2.3 in the Allan Block Spec Book.   (ref. BP, Chapter 6.5)

Allan Block is working to achieve our industry initiative of Zero Wall Failures. With our Best Practices Manual and experience in the industry we are trying to expand the knowledge base for the design of segmental retaining walls (SRW's) by communicating and educating the professionals in the industry.  To see the full Best Practices Manual, visit allanblock.com to download today and keep an eye out for more industry Best Practice recommendations here.