Low-volume secondary roads requiring rehabilitation can be restored using the full-depth reclamation process with calcium chloride to achieve increased bearing capacity, minimize frost heave damage, and reduce highway maintenance expense. Full-depth reclamation uses apulverizer to grind the asphalt surface, blending it with the gravel base to a depth of 8 in. The road is then reshaped and approximately three-quarters of the required calcium chloride is added. Additional pulverization is performed to ensure a uniform mixture of road material and calcium chloride. Following this, the road is graded, rolled, and final application of calcium chloride is made. Testing of full-depth reclamation with and without calcium chloride addition indicates that use of the reclamation process achieves a dense, stable, granular layer, improving overall pavement strength compared to original pavement condition. The addition of calcium chloride enhancesthis stabilization of the granular layer 10% beyond strength measured in the untreated reclaimed road section. A 50 to 60% reduction infrost heave can be expected in reclaimed sections of road using calcium chloride. This paper appears in transportation research record no. 1295, Soil stabilization 1991 .
Abstract