Early in the 1950 construction season the Division of Design requested that the Research Division observe some new methods and materials that were being used in bituminous construction. The projects chosen in most cases represented several of the type throughout the state. There were some instances though where the procedure or material was used in only one project.

The purpose of this investigation was to determine the effectiveness of the materials and the methods which were being used. The nature of this study required that only visual inspections be made. Particular emphasis in this report is placed upon observations of construction procedures and design requirements. When the performance data are available, they will be reported. It might be expected that some of the designs appear satisfactory during construction but not stand the test of traffic and weather. Observations of a nature that might prove essential in later performance investigations are reported.

Report Date


Report Number

No. 61

Digital Object Identifier