PCC Paving with no subbase
PCC Paving with no subbase
(OP)
Does anyone have experience with PCC Paving with no subbase?
I have a design build project, I am the structural engineer, where the GC has a parking lot paving design without a subbase and wants to use it because it is cheaper. I am not familiar with this practice and some issues at the site concern me, as they do the Arch on the project.
The site has a high water table as well as a steep slope down to the paving area. Lean clays and silty to sandy clays are present in the top 4 feet of the site and could possibly be uncompacted fill.
I do not have the slab design or the site prep that is proposed to be followed.
Just looking for general opinions on the practice.
I have a design build project, I am the structural engineer, where the GC has a parking lot paving design without a subbase and wants to use it because it is cheaper. I am not familiar with this practice and some issues at the site concern me, as they do the Arch on the project.
The site has a high water table as well as a steep slope down to the paving area. Lean clays and silty to sandy clays are present in the top 4 feet of the site and could possibly be uncompacted fill.
I do not have the slab design or the site prep that is proposed to be followed.
Just looking for general opinions on the practice.





RE: PCC Paving with no subbase
RE: PCC Paving with no subbase
RE: PCC Paving with no subbase
Second, is the steep slope down to the pavement. With no base the pavement could slide at the soil concrete interface.
Third, is you comment that you don't have the site prep that is to be used. As pointed out previously a consistant subgrade is very important with no base.
RE: PCC Paving with no subbase
If you are in an area with prolonged below freezing weather, you'll need to either lower the water table, replace the unsuitable material, or both to prevent heaving. Since drains tend to get clogged, I'd lean towards replacing the native soil with a sand/gravel base course.
"...students of traffic are beginning to realize the false economy of mechanically controlled traffic, and hand work by trained officers will again prevail." - Wm. Phelps Eno, ca. 1928
"I'm searching for the questions, so my answers will make sense." - Stephen Brust