- 303 - SECTION 501 -- GENERAL REQUIREMENTS
501.01 General
1.This Section describes materi als, procedures and equipment that are common to items of work described in Division 500. The requirements in
2.Materials:
a.Asphaltic Materials include:
1.Performance Graded Binder (PG Binder) (2) Emulsion (3) Cutbacks (4) Other liquid asphalt based materials b. Asphaltic Surfacing Materials include: (1) Coats (i.e.: Tack Coats, Armor Coats, etc.)
2.Seals (i.e.: Fog Seal, Scrub Seal, Chip Seal, etc.)
3.Layers using Asphaltic materials (i.e.: Asphaltic Concrete, etc.)
c.All asphalt materials which are outside the specified property ranges shall be paid for at the contract unit price multiplied by the product of the pay factors determined by the pay factor tables in their respective Sections.
3.Bituminous Surfacing includes t he application of coats, seals or layers that utilize Asphaltic Mate rials, excluding bituminous foundation course. Bituminous surfacing work shall be performed in accordance with the contract.
4.Before placing the bituminous su rfacing, the Contractor shall clean the surface to be treated with mechanical brooms or hand tools as necessary to remove all vegetation, loose surface materials, dirt, mud, old crack sealant, unstable bituminous or other deleterious materials. Any surfacing materials not securely bonded to the surface shall be removed. Material cleaned from the surface shall be swept to the sides or windrowed as required and removed from the projec t by the Contractor at no additional cost.
5.Stockpiles and plant sites shall be maintained according to the Contractor’s Storm Water Poll ution Prevention Plan (SWPPP).
6.The Contractor shall prot ect all structures and roadway appurtenances like signs, guardrails, and curbs. If any items are damaged by the Contractor or because of the C ontractor's negligence, then they shall be repaired or replaced in kind at no additional cost to the Department.
7.Bituminous surfacing operations shall not be allowed between sunset and sunrise without permission of the Engineer or unless otherwise specified in the contract.
8.The Contractor shall apply asphaltic materials within the temperature ranges specified in the cont ract, or within written manufacturer recommended temperatures so that uniform mixing and spreading is attained.
501.01 General Requirements
- 304 - 9. Volume Measurement:
a.All volumes of asphaltic materials (except tack coat and fog seal) shall be measured at 60°F (15 C).
b.If the temperature is other than 60°F (15 C), then the measured volume shall be corrected as follows: Calculated Volume for Payment Pay Volume (English) = AV [1.00000 + [.00025 (60°F - T)]] Pay Volume (Metric) = AV [1.00000 + [.00045 (15 C – T)]] T = Asphaltic Material Temperature in Degrees Fahrenheit (Celsius) AV = Actual Volume at Field Temperature (T)
501.02 Equipment
1.All equipment shall be adequate for its intended purpose and shall be maintained in satisfactory working condition.
2.The Contractor shall be respon sible for all equipment calibrations.
3.The hauling equipment shall consist of trucks equipped for dumping material into spreader boxes, hoppers, or in a windrow. They shall be constructed and maintained to prevent loss of materials during hauling operations.
4.Equipment used for heating asphaltic materials shall be able to heat the material properly. The equipment shall be provided with an accurate temperature measuring device to indica te the temperature of the asphaltic material in the unit. The use of equipm ent or methods which will introduce moisture or damage the material will not be allowed.
5.Distributors:
a.All distributors and supply tanks shall be mounted on pneumatic tired trucks or trailers. T he units shall be designed to avoid roadbed rutting or other damage. They shall be powered to maintain the required speed for effective operation.
b.Distributors shall be equipped with the following devices:
1.Tachometer and distribution tables.
2.Pressure gauges or pump control devices capable of maintaining uniform distribut ion of required quantities.
3.Adjustable length, full circulating spray bars with nozzles having rotation adjustment.
4.Heating coils and a burner. (5) Thermometer well and an accurate thermometer.
6.Suitable opening in the dome. (7) Calibrated measuring stick.
c.The spray bar length shall allow adjustable increments of approximately 1 foot (300 mm). All nozzles shall be adjustable vertically to various heights above the road surface and provide uniform spray coverage. General Requirements 501.02 - 305 - d. The Contractor shall furnish certified copies of the distributor and supply tank calibrations to the Engineer.
6.Aggregate Spreaders:
a.Aggregate spreaders shall be self-propelled, equipped and operated so that the aggregate will be spread uniformly, continuously and without segregation at the required rate over the full width of the asphaltic material in one pass.
b.The spreading hopper shall be equipped with adjustable cutoff gates to allow spreading of aggregate over the required width of asphaltic material.
c.The unit shall have a rear hopper to receive the aggregate from the haul trucks.
d.A grill shall be mounted over the spreading hopper with openings that will retain all oversize and foreign objects.
7.Mechanical brooms shall be power-driven rotary brooms equipped with a shield to prevent damage to the operator and motorists.
8.In urban areas, sweepers mu st be designed to operate near vehicles, pedestrians, and other typical obstacles.
9.Truck beds or other equipment with which the bituminous mixture comes in contact may only be cleaned with products from the Department’s Approved Products List. Diesel fuel may be used as a cleaning solvent only at the end of the work day to avoid contaminating the asphaltic materials. Diesel fuel shall be used in accordance with all applicable environmental laws and regulations. - 306 - SECTION 502 -- ASPHALTIC CONCRETE PAVEMENT SMOOTHNESS
502.01 General
1.This Specification establishe s a standard for evaluating asphaltic concrete pavement smoothness, and acce ptance parameters. The intent of the specification is to produce a finish ed asphaltic concrete pavement driving surface with an International Rou ghness Index (IRI) no greater than 68 inches per mile. Pavement smoothness will be evaluated as described in this section.
2.When the pay item "Asphalt Pavement Smoothness Testing I/D" is included in the contract, all the re quirements of the following sections including the incentive/disincen tive provisions shall apply.
3.When the pay item "Asphalt Pavement Smoothness Testing" is included in the contract, the incentive/ disincentive provisions of this section do not apply, but the smoothness testing, evaluation, and pavement surface correction shall be performed as described in this provision.
4.When the contract contains no item for smoothness testing, the asphaltic concrete pavement shall be evaluated in accordance with Paragraph 11 of Subsection 503.04.
502.02 Equipment
1.The Contractor shall furnish a non-contact inertial pavement profiler that meets the requirem ents of ASTM Standard E 950, verified by the manufacturer. The profiler must be appr oved by the Nebraska Department of Transportation as specified in Subsection 502.03.
2.The non-contact profiler may be a lightweight version or a high speed version.
3.The non-contact profiler shal l be equipped with a computerized system that will record, analyze, print and electronically transfer the test data. The profiler shall be equipped with a guide bar.
4.The non-contact profiler shall produce a printed pavement profile report. The report shall include the following information:
a.Project number
b.Test date c. Traffic lane d. Test direction e. Test path f. Pass number (1 for initial test; 2, 3, etc. for repeat runs) g. Operator's name
h.Project stations
i.Data filter values j. IRI values fo r each test section
k.Bump locations for each test section, as determined by California profilograph emulation.
Source: Nebraska Standard Specifications for Highway Construction, 2017 Edition. Pages 337–339 of 1,048.