FLashfill/CDF
FLashfill/CDF
(OP)
I work for a local government where we see flashfill being used for utility repairs under pavement. We seem to be experiencing "heaving" in these areas, especially in the winter months (midwestern climate). In the summer these areas actually settle a little closer to level, but in the winter there are bumps in the road and concrete sidewalk panels that are heaved up. Has anyone else experienced this, and does anyone know why? We beleive that the fill is freezing and expanding, lifting the surface above. If this is true, would keeping flashfill below the frost line prevent this from happening?





RE: FLashfill/CDF
Maybe the CDF is transmitting cold to the underlying soil causing that to freeze if it is at or below the seasonal water table? The soil above the bottom of the CDF may be above the water table and more of an insulator to the material below. Thus, you may see the heave in the winter over the CDF.
Mike McCann
MMC Engineering
RE: FLashfill/CDF
thread256-146654: Footings for small cabin re:frost heave
thread592-17681: What causes frost heave?