Recycled Crushed Concrete
Recycled Crushed Concrete
(OP)
Hi all,
This is my first post so go easy. I am involved with a project currently in which we are placing a large truck dock at a facility which lies in a flood plain. The soil conditions here are poor...lots of soft spots and generally weak soil. I can provide more info if needed. The adjacent bldg. sits on driven piles. We got the job before we knew about the poor soil (don't ask) and thus are now having to throw more concrete at our pad in order to compensate for the bad subgrade modulus. Fortunately, after some on site testing, we got word from the geotech that we can comfortably use a subgrade modulus of 100pci and be in the clear.
The contractor is wanting to use recyclded crushed concrete (approx. 3" nominal size) below the standard layer of crushed run stone that we normally spec. They reason that it will help with the soft spots. Of course the crushed run stone will still be placed and compacted. I do not see any problems with this, but I am young and wanting to understand what the implications of this could be.
Thanks
This is my first post so go easy. I am involved with a project currently in which we are placing a large truck dock at a facility which lies in a flood plain. The soil conditions here are poor...lots of soft spots and generally weak soil. I can provide more info if needed. The adjacent bldg. sits on driven piles. We got the job before we knew about the poor soil (don't ask) and thus are now having to throw more concrete at our pad in order to compensate for the bad subgrade modulus. Fortunately, after some on site testing, we got word from the geotech that we can comfortably use a subgrade modulus of 100pci and be in the clear.
The contractor is wanting to use recyclded crushed concrete (approx. 3" nominal size) below the standard layer of crushed run stone that we normally spec. They reason that it will help with the soft spots. Of course the crushed run stone will still be placed and compacted. I do not see any problems with this, but I am young and wanting to understand what the implications of this could be.
Thanks





RE: Recycled Crushed Concrete
RE: Recycled Crushed Concrete
RE: Recycled Crushed Concrete
I have worked for decades with structural engineers and this topic is a source of confusion. Subgrade modulus does not help a geotechnical engineer evaluate settlement. It's a structural contrivance (a good one) for the benefit of structural design.
f-d
ípapß gordo ainÆt no madre flaca!
RE: Recycled Crushed Concrete
RE: Recycled Crushed Concrete
Exactly what I needed to hear. Thanks for the advice Ron.
From a learning standpoint, how exactly does the RCC help to stabilize the subgrade? Intuitively it seems like it would consolidate soft spots which could then just be filled in with the crushed stone to bring it back up to grade, but I'm not sure if this is the correct thinking.
RE: Recycled Crushed Concrete
RE: Recycled Crushed Concrete