MEMBRANE TECHNIQUE FOR CONTROL OF EXPANSIVE CLAYS.

During initial road construction, a variety of experimental sections were built to test such stabilization methods as moisture and compaction control, chemical admixtures, electro-osmosis, overexcavation, ditch widening, underdrains, and membranes, alone or combined. Some methods were relatively successful when compared to the rapid deterioration of the untreated highways. These findings led to choosing impermeable rubber membranes to control moisture in the clay subgrades. This report presents the data on the three full-scale overlays and the success of the membrane.