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C303 pipe and CLSM

C303 pipe and CLSM

C303 pipe and CLSM

For a 48" C303 pipe (bar-wrapped concrete pipe) rated for 10' of cover, is it usually acceptable to use CLSM (up to 1' above the pipe) if the depth of cover is around 15'-20'?

Thank you,

RE: C303 pipe and CLSM

the CLSM will allow backfilling around under/around the haunches without compaction or entering the trench and is a good idea. make sure you dont float the pipe

RE: C303 pipe and CLSM

It *might* work, but you are probably voiding any warranty/guarantee from the manufacturer by installing deeper than the manufacturer's allowed cover, so it would all be on the EOR if something goes wrong down the road.


RE: C303 pipe and CLSM

my thought is that you would use the CLSM, regardless. But you will still need to design the pipe for the backfill and loading conditions. Not sure why you would spec pipe that cannot handle the loading conditions.

RE: C303 pipe and CLSM

related question - what is the typical allowable joint deflection for 48" C303? I am not looking at deflecting for a curved alignment, but for potential uplift condition due to hydrostatic pressure

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