Pavement Elevation Tolerances
Pavement Elevation Tolerances
(OP)
For a large, broad, paved (ACP) commercial lot (a parking lot for example) I would appreciate your comments as to a reasonable construction tolerance in elevation from design to as-constructed grades.





RE: Pavement Elevation Tolerances
I don't have any specs for such a large parking area - in our highway project we use plus/minus 6mm for asphalt work and plus/minus 10mm for base course (both laid with a paver). Our surface irregularity is a "few" greater than 7mm and "more" greater than 4mm. The ability of realizing the tolerances, of course, is more in line with contractor's experienced personnels' attention to detail and good workmanship.
RE: Pavement Elevation Tolerances
However, when parking lot designers use a minimal grade of 1% there is greater potential for a ponding or spread problem. When there is little room for error in the finished grade, the triming and fine grading of the subbase is critical. Any paver adjustments while moving to accomodate pavement thickess can translate into high or low points. Good luck with the finished surface.
RE: Pavement Elevation Tolerances
RE: Pavement Elevation Tolerances
RE: Pavement Elevation Tolerances
Two good sources of information on tolorances for paving and floor slabs would be the Portland Cement Association (PCA) and the American Concrete Insititute (ACI). They both have specific publications and specifications that address the topic.
RE: Pavement Elevation Tolerances
At the expansion of an industrial plant in the early 1990's we had the flatness F number measured for many existing slabs that we knew from experience had good drainage characteristics. From this data base, we selected F numbers to specify for new construction. This approach to specification enforcement worked well.
RE: Pavement Elevation Tolerances