(A) All bituminous mixtures shall be placed in a workmanlike manner under weather conditions favorable to assuring a high-quality pavement.
(1) Crushed stone bases/sub-bases shall be fine-graded and compacted prior to priming.
(2) Water shall be added to the material during fine grading if it becomes necessary in order to achieve compaction and avoid segregation of the material.
(B) Bituminous concrete surface courses and binder courses shall be laid with a self- propelled paver with a vibrating or tamping screed.
(C) Bituminous base shall be laid with a self- propelled Barber Greene paver as used in highway construction, or its equal.
(D) Two (2) rollers shall be provided to function as a breakdown roller and a finish roller.
(1) The breakdown roller may be a tandem or three-wheel steel roller in the eight (8) to fifteen (15) ton weight range.
(2) The finish roller shall be a tandem drum roller in the five (5) to ten (10) ton weight range, provided, however, that a vibratory roller of equivalent compactive effort may be used as a finish roller.
(E) Successive layers of bituminous materials shall not be placed unless the supporting layer is free of water, dirt, mud, and other undesirable debris.
(F) Longitudinal joints between successive lifts of bituminous concrete mixtures shall be staggered by at least four (4) inches.
(1) The temperature of the mixture and the rolling pattern shall be such that tight, well-knit longitudinal joints between passes are achieved.
(2) The compactive effort shall be such that it produces a dense, durable mat.
TABLE 34-32 | STRUCTURAL COMPOSITION - FLEXIBLE PAVEMENT |
TABLE 34-32 | STRUCTURAL COMPOSITION - FLEXIBLE PAVEMENT |
Arterial/Industrial | |
Surface: II-11 | 1½” depth |
Binder: II-11 | 2" depth |
Sub-base: Bituminous Aggregate Mix | 8“ depth |
OR | |
Surface: II-11 | 1 ½” depth |
Binder: II-11 | 2" depth |
Sub-base: Bituminous Aggregate Mix | 5“ depth |
Sub-base: Crushed stone | 8" depth |
Collector (Commercial) | |
Surface: II-11 | 1½” depth |
Binder: II-11 | 2" depth |
Sub-base: Bituminous Aggregate Mix | 6“ depth |
OR | |
Surface: II-11 | 1 ½” depth |
Binder: II-11 | 1½" depth |
Sub-base: Bituminous Aggregate Mix | 4“ depth |
Sub-base: Crushed stone | 8" depth |
Collector (Residential) | |
Surface: II-11 | 2” depth |
Binder: II-11 | 2½" depth |
Sub-base: Bituminous Aggregate Mix | 4“ depth |
OR | |
Surface: II-11 | 1½ depth |
Sub-base: Bituminous Aggregate Mix | 3" depth |
Sub-base: Crushed stone | 8" depth |
Local (Commercial) | |
Surface: II-11 | 2” depth |
Binder: II-11 | 2" depth |
Sub-base: Bituminous Aggregate Mix | 4“ depth |
OR | |
Surface: II-11 | 1½” depth |
Binder: II-11 | 3" depth |
Sub-base: Crushed stone | 8" depth |
Local (Residential) | |
Surface: II-11 | 2" depth |
Sub-base: Bituminous Aggregate Mix | 6“ depth |
OR | |
Surface: II-11 | 1½” depth |
Binder: II-11 | 2" depth |
Sub-base: Crushed stone | 8" depth |
Land Access | |
Surface: II-11 | 2" depth |
Sub-base: Bituminous Aggregate Mix | 4“ depth |
OR | |
Surface: II-11 | 1½” depth |
Binder: II-11 | 1½" depth |
Sub-base: Crushed stone | 8" depth |
Alley | |
Surface: II-11 | 2" depth |
Sub-base: Bituminous Aggregate Mix | 4" depth |
Maximum lift thicknesses shall be eight (8) inches for crushed stone, six (6) inches for Bituminous Aggregate Mixture, two and one-half (2½) inches for II-11 binder, and two (2) inches for II-11 surface. All streets shall be constructed with a lime-modified sub-grade to a depth of at least eight (8) inches.
(1) Minimum width of any single pass of the spreader/paver shall be capable of producing a lane width equivalent to one-half (1/2) of the roadway width (i.e., from edge of curb to centerline). In variable width areas such as cul-de-sacs, no single pass of the spreader/paver shall be less than fifteen (15) feet.
(G) The final surface course shall be placed so that following compaction the roadway surface is either at the gutter flag or above it by no more than one-fourth (1/4) inch.
(1) Care shall be taken to assure that the final surface course properly meets drainage grates, manhole frames, and valve boxes.
(2) The final surface shall be neat and uniform in appearance.