MASONRY RETAINING WALL - HOW LONG BEFORE BACKFILLING
MASONRY RETAINING WALL - HOW LONG BEFORE BACKFILLING
(OP)
I am designing a 3 ft high bar reinforced 8" masonry wall, with depth in the ground also 3 ft, all on a reinforced concrete footing.
How long should I allow for masonry curing before back filling? - I want to put this in notes. No cylinders or cubes will be taken to review reports.
How long should I allow for masonry curing before back filling? - I want to put this in notes. No cylinders or cubes will be taken to review reports.






RE: MASONRY RETAINING WALL - HOW LONG BEFORE BACKFILLING
In my experience usually within 2 weeks you hit the 28 day value, but it can vary a week either way depending on the mix design and environmental conditions. Only way to know for sure is to take some cylinders.
The concrete supplier may have historic data on the mix from testing within the batching plant which might offer some guidance with respect to the time.
Additionally I have seen some people specify for example that walls may be backfilled when 75% of the nominal strength of the grout is attained, over to the contractor as to how he determines this.
RE: MASONRY RETAINING WALL - HOW LONG BEFORE BACKFILLING
RE: MASONRY RETAINING WALL - HOW LONG BEFORE BACKFILLING
But in neither case allow wheel or other loads above the wall closer than 5 feet.
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RE: MASONRY RETAINING WALL - HOW LONG BEFORE BACKFILLING
Mike McCann, PE, SE (WA)