I appreciate all of the insight. The final design spec that I have approved will be to leave the current material in place including the bx-1100 and the 1.5 inch minus gravel. The new "subgrade" will be graded and the deep ruts filled with 2 inch minus. A new blanket of bx-1200 will be...
I think part of the original problem was the 1.5 inch minus gravel was poorly sorted and didn't "lock" properly into the apertures in the geogrid material. Instead, they pushed through the apertures causing the pavement section to fail. I agree that a lift of 3/4 inch to 1 inch clean followed...
We constructed a new utility waste landfill and within a week the haul road began to rut and quickly became unusable. The landfill and haul road is constructed on Mississippi River alluvium with most of the good high plasticity clay (CH) used for liner construction. The haul road subgrade...