Early in 1962, the Division of Rural Highways selected several base stabilization projects for construction during the 1962 season. These projects were to involve the addition of 1-1/2 to 3 inches of compacted granular base to existing, rural secondary, traffic-bound macadam roads. Since these roads were not intended to be surfaced, calcium chloride and sodium chloride were to be added to the additional granular base material in an attempt to retain or "hold" the aggregate on the road. This treatment was in tended to improve the road and to build up the base over a period of a few years until the road could be surfaced.

The Division of Research was requested to observe the construction and performance of these projects and to evaluate the effectiveness of calcium or sodium chloride in this type of "stage" construction. Accordingly, eight projects totaling 40.111 miles were selected for observation. These projects included three (12.434 miles) in which calcium chloride was used, three (11.200 miles) in which sodium chloride was used, and two (16.477 miles) in which no additive was used. Two additional projects involving similar types of construction are also reported. The Garrard County project was completed however, much of this base material is scattered or washed into the ditches or is pulverized and blown away. This results in an inadequate base when the wearing course is eventually constructed.

Report Date


Report Number

No. 201

Digital Object Identifier