does sand cement slurry penetrate gravel base ? 1

[andy2175]

I am placing a bottomless vault in a pit on a two foot bed of compacted aggregate, the backfill of vault will be 2 sack sand cement slurry,

any chance the slurry will soak into the gravel and prevent it from draining ? Any journal article or other quotable sources available ?

thanks

Andy

 

[Ron]

Yes. Journal article not necessary

 

[cvg]

place geosynthetic or 8 mil poly in the bottom to separate and your problem solved

 

[Althalus]

What is the gravel like? What is the slump of the slurry?

If it is an open graded gravel only, then it will penetrate upto a couple feet depending on the size, gradation, and shape of the gravel. If it is a sand/gravel mix, then it should only penetrate a few inches.

If your vault is big enough, it should be such that it will still drain even with some slurry penetration around the edges.

This is not a journal or calculation thing. It's just experience and common sense. Slurry is a fluid. The soil at the bottom is a sort of filter. The more viscous the fluid and the tighter the filter, the less it will penetrate. The opposite is true with less viscous and more open respectively.

 

[concretemasonry]

What is the exact definition of "gravel". - There many factors like gradation and particle shape.

Dick

Engineer and international traveler interested in construction techniques, problems and proper design.