Macadam Base Shoulders, HR-181, 1977

(1977) Macadam Base Shoulders, HR-181, 1977. Transportation, Department of


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Highway safety and pavement performance can be directly influenced by the type of shoulders that are constructed. Shoulder design alternatives have always been rather limited. Moreover, the use of some of the alternatives has always been restricted by funding limitations. This research project seeks to explore the use of modified macadam base construction for shoulders. This type of shoulder design could offer the designer another option when paved or stabilized shoulders are being considered. Macadam base construction has in the past been shown to be quite strong and freedraining. Two macadam base shoulder designs were developed and constructed for this research project. A new roadway embankment and P.C.C. pavement were constructed on a section of US 6 east of Adel in Dallas County. The macadam base shoulders were constructed adjacent to the pavement as part of the project. The north shoulder was finished with a choke stone course and bituminous surface treatment and the south shoulder was finished with a two (2) inch layer of Type B Class II asphalt concrete. The initial results are considered satisfactory. Follow-up performance evaluation and load bearing tests are planned.

Item Type: Departmental Report
Keywords: Asphalt concrete, Base course (Pavements), Bituminous materials, Chokes, Cost effectiveness, Deterioration, Drainage, Macadam, Pavement joints, Pavement maintenance, Pavement performance, Road shoulders, Stone, Strength of materials, Surface treating
Subjects: Transportation > Pavements
Transportation > Pavements > Asphalt
Transportation > Pavements > Concrete
Transportation > Roads and highways
Transportation > Design and Construction
ID Code: 17017
Deposited By: Iowa DOT Library
Deposited On: 03 Jun 2014 13:12
Last Modified: 06 Jan 2015 16:32