304ASPHALT BASES

304.01Description

This work shall consist of constructing an HMA base on a prepared surface or preparing an existing asphalt pavement for use as an asphalt base in accordance with

105.03

MATERIALS

304.02Materials 10

Materials shall be in accordance with the appropriate sections.

304.03Sealing Cracks and Joints

Cracks and joints shall be sealed in accordance with 408.

304.04Partial Depth and Full Depth Patching

Areas to be patched will be marked on the surface by the Engineer. The marked pavement shall be removed to the depth shown on the typical section or as directed. A minimum 2 in. vertical joint shall be constructed with the pavement that remains in place. If it is determined that the marked pavement is to be removed full depth, the 20 patch depth shall be to the bottom of the existing asphalt material or as directed.

The subgrade of the aggregate base under the patches shall be compacted in accordance with 203.25. If the excavation for patches reveals unsuitable subgrade material, such material shall be removed to a depth of 6 in. and backfilled to the top of subgrade with compacted aggregate in accordance with 301. Unauthorized excavation beyond neat lines shall be replaced with compacted aggregate in accordance with 301.

The excavated patch areas shall be filled with HMA for patching of the type specified in the pay item and as shown on the plans. HMA used for patching shall be 30 in accordance with 402. An MAF in accordance with 402.05 will not apply. The 175°F temperature requirement for the previously paved course in accordance with 402.13 will not apply. Mixtures will be accepted in accordance with 402.09.

Each course shall be compacted using mechanical equipment in accordance with

409.03(d)

A smooth riding surface shall be maintained on HMA patches at all times. Deformation due to traffic or other conditions shall be corrected immediately. HMA of the type specified in the pay item shall be used to maintain patches. 40 304.04

Unless otherwise specified, patches sha ll be completed during daylight hours and opened to traffic at the close of the workday. Patches that cannot be completed prior to the end of daily operations shall be backfilled, compacted, and a temporary surface placed to carry traffic, unless otherwise specified.

304.05Widening

The outside face of the excavated area shall be left as nearly vertical as the nature of the material will allow and not wider than the outside limits of the widening section. The subgrade in the widened area shall be compacted in accordance with 207. 50

Widening mixtures shall be HMA mixtures in accordance with 402 and as shown on the typical section or as directed.

For widening 3 ft or less and 330 lb/sq yd or less, six passes of trench rollers in accordance with 409.03(d)6 shall be used. For widening 3 ft or less and greater than 330 lb/sq yd, 12 passes of trench rollers in accordance with 409.03(d)6 shall be used.

For widening greater than 3 ft and 330 lb/sq yd or less, six passes of rollers with a compaction wheel bearing of no less than 300 lb/in. shall be used. 60

For widening greater than 3 ft and greater than 330 lb/sq yd, 12 passes of rollers with a compaction wheel bearing of no less than 300 lb/in. shall be used.

Except for surface mixtures, the course fl ush with the top of the existing surface shall be compacted with equipment entirely on the widening.

An MAF in accordance with 401.05 or 402.05 will not apply. HMA mixtures will be accepted in accordance with 402.09.

304.06Method of Measurement

Widening and patching will be measured by the ton of the type of HMA specified, in accordance with 109.01(b). Compacted aggregate for base will be measured by the ton in accordance with 109.01(b).

304.07Basis of Payment

The accepted quantities for widening and patchi ng will be paid for at the contract unit price per ton, of the type of HMA specified, complete in place. Compacted aggregate for base will be paid for in accordance with 301.10.

Payment will be made under:

Pay Item Pay Unit Symbol

HMA Patching, Full Depth, * ............................................ TON type 304.05

HMA Patching, Partial Dept h, * ........................................ TON type Widening with HMA, * ..................................................... TON type 90 * Mixture type in accordance with 402.04.

Excavation for patching will not be paid for separately but shall be included in the cost of the patching material.

The cost of furnishing, storage, hauling, and placing of all materials; pavement removal as required; temporary pavement required to carry traffic; choke aggregate required to eliminate pickup; disposal; excavation; preparation of subgrade; compacting; and finishing except as otherwise provided shall be included in the cost of the patching materials. 100

The cost of excavation and disposal of existing materials required for the compacted aggregate or HMA widening material shall be included in the cost of the HMA widening material.

Replacement of pavement damaged by the Contractor’s operations shall be at no additional payment.