Appendix 3.2.0. GENERAL CRITERIA  

All streets shall be constructed on a compacted or stabilized subgrade, and shall consist of a base layer and Hot Mix Asphaltic Concrete (HMAC) surface layer, and/or a Portland Cement concrete (PCC) pavement, designed by a Licensed Professional Engineer registered in the State of Texas, using:

1.

The concepts of the AASHTO Pavement Design Guide incorporated into the City of Austin Computerized Pavement Design procedure,

2.

The current edition of the City of Austin Policy on Geometric Roadway Design, and

3.

The current edition of the Austin Drainage Criteria Manual.

The material selection shall consist of one or more of the following support layers that conform to the City of Austin Standard Details and the City of Austin Standard Specifications.

1.

Improved subgrade,

2.

Compacted subbase, stabilized subbase,

3.

Flexible base, asphalt stabilized base, and

4.

A surface layer consisting of either a hot mix asphaltic concrete (HMAC) or Portland Cement concrete (PCC).

Each material selected for the structural pavement design section shall meet or exceed the following minimum requirements:

•  Subgrade compaction, 95% (Tex-114-E);

•  Lime Stabilized Subgrade, eight-inch minimum thickness;

•  Portland cement treatment of materials in place, six-inch minimum thickness;

•  Flexible base, eight-inch minimum thickness;

•  Asphalt treated base, four-inch minimum thickness;

•  Hot Mix Asphaltic Concrete (HMAC) base, two-inch minimum thickness;

•  Hot Mix Asphaltic Concrete (HMAC), 1 ½-inch minimum thickness;

•  Jointed reinforced Portland Cement concrete (PCC) pavement, six-inch minimum thickness.

Exception to the flexible base course: thickness may be reduced by one inch when the material is placed on solid rock.