434Asphalt Paved Ditches

434.1 General Description

This work includes paving ditches, spillways, and other similar waterways with hot asphalt mixture.

434.1.01 Definitions

General Provisions 101 through 150.

434.1.02 Related References

A. Standard Specifications Section 400—Hot Mix Asphaltic Concrete Construction Section 802—Aggregates for Asphaltic Concrete Section 820—Asphalt Cement Section 828—Hot Mix Asphaltic Concrete Mixtures B. Referenced Documents GDT 7 GDT 66 GDT 115

434.1.03 Submittals

General Provisions 101 through 150.

434.2 Materials

Ensure that materials meet the requirements of Section 802, Section 820, and Section 828.

434.2.01 Delivery, Storage, and Handling

General Provisions 101 through 150.

434.3 Construction Requirements

434.3.01 Personnel

General Provisions 101 through 150.

434.3.02 Equipment

Use equipment that meets the requirements in Section 400 for mixing and transporting the asphaltic concrete. A. Hand-Operated Roller Use a hand-operated roller that weighs at least 300 lbs. (135 kg). B. Small Power Roller Use a small power roller satisfactory to the Engineer. C. Vibratory Device Use a vibratory device satisfactory to the Engineer. D. Hand Tampers Use hand tampers to compact areas that cannot be reached with rollers or vibrators. E. Forms Use forms that are satisfactory to the Engineer, if required.

434.3.03 Preparation

General Provisions 101 through 150.

434.3.04 Fabrication

General Provisions 101 through 150.

434.3.05 Construction

Use ditch paving construction methods that allow water to flow continuously and that keep the ditch unobstructed to prevent ponding or standing water. Protect the ditch paving areas under construction from flowing water, elements, and other disturbances until the materials are fully set. A. Develop the Asphalt Mixture Use a uniform, homogeneous asphalt mixture of aggregate and bituminous material. A job mix formula is not required; however, base the mixture on an approved design analysis that meets the requirements of either a 4.75 mm mixture or 9.5 mm Superpave mixture (Level A) as described in Section 828 except that testing for moisture susceptibility, GDT 66 and rutting susceptibility, GDT 115, will not be required. The asphalt content for ditch paving shall be set 1.0% higher than the optimum asphalt content determined during the mix design analysis. Control the mixture within the mixture control tolerances for the respective mix given in Section 828. Do not continue operation outside the mixture control tolerances. B. Form the Subgrade Form the subgrade as follows: 1. Form the subgrade at the required depth below and parallel to the finished surface of the ditch or waterway required by the plans. 2. Remove soft, yielding, or otherwise unsuitable material and substitute with suitable material. 3. Compact the subgrade to 90 percent of the maximum dry density as determined by GDT 7. Finish to a smooth, firm surface. 4. If shown on the plans, place and compact the subgrade material to the required thickness. C. Stake the Forms If forms are required, stake them securely into position at the correct line and elevation. D. Place the Asphalt Mixture Place the mixture on the prepared subgrade only when the subgrade is properly prepared and weather conditions are suitable. Place as follows: 1. Place the mixture within the temperature limits of 275 º to 325 ºF (135 º to 160 ºC). 2. Smooth the mixture by raking or screeding. 3. Thoroughly compact the mixture as follows: a. Roll with a hand-operated roller, small power roller, or vibratory device satisfactory to the Engineer. b. Use hand tampers to compact areas that cannot be reached with rollers or vibrators. c. Compact until the surface is smooth and even and the texture is dense and uniform. The thickness, lines, grades, and cross section shall be as shown on the Plans. 4. Remove forms, if used, and replace with compacted backfill. Shape the shoulders and slopes and complete them to conform to the required section.

434.3.06 Quality Acceptance

General Provisions 101 through 150.

434.3.07 Contractor Warranty and Maintenance

General Provisions 101 through 150.

434.4 Measurement

A. Asphalt Ditch Paving Asphalt for ditch paving is measured in tons (megagrams) as mixed, placed, and accepted. The actual weight is determined by using an approved motor truck scale to weigh each loaded vehicle as the material is hauled to the roadway. The weight measured includes all materials. B. Incidental Items Incidental items such as preparing the subgrade and excavating unsuitable material and backfill are not measured for separate payment, unless otherwise specified. Those costs are included in the Unit Price Bid.

434.4.01 Limits

General Provisions 101 through 150.

434.5 Payment

A. Asphalt Ditch Paving Asphalt for ditch paving will be paid for at the Contract Unit Price per ton (megagram) complete in place and accepted. Payment is full compensation for furnishing materials, bituminous material, and equipment and for preparing the subgrade, hauling, stockpiling, mixing, spreading, and rolling. B. Incidental Items Unless otherwise specified, no separate payment will be made for incidental items. Payment will be made under: Item No. 434 Asphalt ditch paving mixture Per ton (megagram)

434.5.01 Adjustments

General Provisions 101 through 150.