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Frictional connection - Geogrid and Concrete Retaining Wall 1

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TKMOT

Geotechnical
Feb 24, 2006
1
I am in the process of designing a geogrid reinforced concrete Lock-Block retaining wall (some 5 m in height). The geogrid will be attached to the wall through a frictional connection between each successive layer of blocks. I was wondering if it was a wise choice to also specify a thin layer of sand between the blocks (nominal 25 mm/1 inch)and the grid to provide a more uniform frictional connection. Or, does the weight of overlying blocks and the concrete surface on the grid generally provide an adequate frictional connection.
 
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Sand is not necessary. I suggest contacting the manufacturer for pullout strengths.
 
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