- 372 - SECTION 516 -- BITUMINO US PAVEMENT PATCHING
516.01 Description
1.Bituminous pavement patching shall consist of the removal and disposal of unstable or disintegrated bi tuminous or concrete surfacing and/or base course and the placing and compacting of "Asphaltic Concrete, Type ___", at locations specified by the Engineer. Patching shall include the correction of faulty subgrade conditions.
516.02 Material Requirements
1.All materials shall conform to the requirements in Table 516.01. Table 516.01 Material Requirements Applicable Materials Section Asphaltic Concrete .......................... 1028 Performance Graded Binder ........... 1029 Emulsified Asphal t .......................... 1031, 1032 Aggregate ....................................... 1033
516.03 Equipment
1.All equipment used in pavement patching shall conform to the requirements in Sections 501 and 503.
516.04 Construction Methods
1.The Contractor shall patch bi tuminous and concrete pavement in accordance with the requirements in Section 503.
2.Each pavement patch shall be completed in the same work day.
3.The removal and disposal shall be performed in accordance with the requirements in Section 203.
4.The removed bituminous or concrete surfacing layers shall be replaced with asphaltic concrete.
5.Subgrade Repair: a. The underlying material shall be uniformly compacted to the Engineer's satisfaction.
b.After compaction of the underlying material, a tack coat shall be applied on the vertical faces and bottom surface as described in Section 504. The rate of application shall be as directed by the Engineer.
c.If the underlying material includes an unstable base course, it shall be removed and wasted. The base course shall be replaced with asphaltic concrete.
d.If the underlying material includes unstable subgrade materials, they shall be removed and wasted or salvaged for reused back in the repair if the moisture content of these materials is adequate or can be made adequate for proper compaction, Subgrade shall be replaced as follows:
1.Subgrade from within a repair that extend to a depth of 16 inches or less shall be replaced with asphaltic concrete.
2.Wasted subgrade from within a repair that extends to a depth greater than 16 inches shall be replaced with material as required by Bituminous Pavement Patching 516.05 - 373 - the Engineer. This material may be the salvaged soil, imported soil similar to the subgrade soils, asphaltic concrete or “granular materials for patching.”
3.“Granular materials for patching” shall be crushed concrete, recycled asphaltic concrete, sand, gravel or crushed rock. The type and quality of these materials shall be satisfactory to the Engineer.
4.When “granular materials for patching” are used to replace the subgrade material, the Engineer may require they be drained by day- lighting the repair excavation to the adjacent foreslope. The excavation for day-lighting shall be made in accordance with the Engineers requirement and shall be filled with the same type of “granular materials for patching” used in the repair.
6.All edges shall be vertical and straight. 7. The thickness of the layers shal l be adjusted so that the required density is achieved throughout the layer. The final elevation of the patch's surface shall be approximately 1/ 8 inch (4 mm) above the adjacent surfacing.
516.05 Method of Measurement
1.a. Bituminous Pavement Patc hing of flexible pavement and the repair or replacement of any subgrade material authorized by the Engineer will be measured by one of the following methods based upon the depth of the patch.
1.For patches 16-inches (40cm) deep or less, determined at the time of patching, the patching wi ll be measured by the ton (megagram) of “Asphaltic Concrete for Patching, Type ___” required to complete the patch and repair any faulty base course or subgrade. No equipment rental will be paid for this work, and all equipment used to complete the work shall be subsidiary to the item, “Asphaltic Concrete for Patching, Type ___.”
2.For patches more than 16 inches (40cm) deep, determined at the time of patching, t he patching will be measured by the ton (megagram) of “Asphaltic Concrete for Patching, Type ___” required to complete the patch and repair any fa ulty subgrade that is replaced with asphaltic concrete. Additionally, the following will apply:
i.The hours of equipment rental required to complete the patching and repair in that portion of the patch deeper than 16-inches and make any required day-light excavations will be measured by the hour of equipment rental in accordance with Section 919. Only approved equipment needed to patch and excavate the failure or make the day-light excavation is to be rented, and only the time utilized to perform the work in the region deeper than 16-inches (40 cm) is to be measured. Excluded is any equipment needed to haul asphaltic concrete, soil or “Granular Materials for Patching” to the site or hau l away material for disposal. (ii) Imported soil or “granular materials for patching” used to replace unstable subgrade materials shall be measured and paid by the cubic yard (CY).
2.a. “Asphaltic Patching of Portland Cement Concrete Pavement, Type_____” and the repair or replacement of any subgrade material authorized by the Engineer will be measured by the square yard (square meter) of completed and accepted work regardless of depth. Additionally,
516.05 Bituminous Pavement Patching
- 374 - the asphaltic concrete used to complete the patch will be measured for payment and included with the roadway tonnage.
b.Bituminous Pavement Patching of concrete pavement is divided into three types (see Table 516.02). The types are based on the size of the individual patches constructed in a single lane. If a damaged area spans two or more lanes, then the c ontinuous patch will be counted as multiple patches -- one patch per lane. Table 516.02 Asphalt Patch Sizes in Portland Cement Concrete Pavement Type Size A 5 SY (5 m2) or less B Greater than 5 SY to 15 SY (5 m2 to 12.5 m2) C Greater than 15 SY (12.5 m2)
3.“Asphaltic Concrete, Type ____,” “Asphaltic Concrete for Patching, Type ___,” “Performance Graded Binder____,” and “Hydrated Lime for Asphalt Mixtures” used in either the patching of flexible pavement or concrete pavement will be measured for payment by the ton (megagram) in accordance with Subsection 503.05.
516.06 Basis of Payment
1.P a y I t e m P a y U n i t Rental of Motor Grader, Fully Operated Hour (h) Rental of Dump Truck, Fully Operated Hour (h) Rental of Loader, Fully Operated Hour (h) Rental of Skid Loader, Fully Operated Hour (h) Asphaltic Concrete for Patching, Ton (Tn) Type _____ [Megagram (Mg)] Asphalt Patching of Portland Cement Square Yard (SY) Concrete Pavement, Type ____ [Square Meter (m 2)]
2.Performance Graded Binder and asphaltic concrete used in the work of pavement patching shall be paid for in accordance with Section 503.
3.Emulsified asphalt for tack coat will be measured and paid for in accordance with Section 504.
4.If more than one type of asphaltic concrete is required, the pay item will be subdivided so the quantities of each type are documented.
5.If imported soil of “Granular Materials for Patching” are used to replace the unstable subgrade materials at a depth greater than 16 inches or to backfill day-light excavations, the pay item will be "Granular Material for Patching" measured by the cubic yard. Payment will be calculated as 0.5 times the bid price (per ton) for “Asphaltic Concrete for Patching, Type_____” in units of $/CY.
6.Replacement of subgrade materials will be paid per hour of equipment rental.
7.Payment is full compensation for all work described in this Section. - 375 - SECTION 517 -- PRIME COAT
517.01 Description
1.This work shall consist of the application of asphaltic materials on bases, roadbeds or other surfaces as sh own in the contract or as designated by the Engineer.
517.02 Material Requirements
1.Asphaltic materials for prime coat shall be the type and grade shown in the contract and shall conform to the requirements of Section 1030.
517.03 Construction Methods
1.The Contractor shall blade off all loose material, then sweep the surface with mechanical brooms until the surface is substantially dust free.
2.a. The Contractor shall distri bute the asphaltic material at a uniform rate of 0.30 Gal/SY (1.36 L/m2).
b.The distributor shall meet the requirements of Subsection 501.02, Paragraph 5.
c.Hand sprayers may be used to coat small and irregular sections.
3.Asphaltic material shall not be applied if the ambient temperature is below 50°F (10 C).
4.The surface shall be dry before asphaltic materials are applied.
517.04 Method of Measurement
1.Asphaltic materials are measur ed by the gallon (liter) at 60°F (16C).
517.05 Basis of Payment
1.P a y I t e m P a y U n i t Prime Coat Asphaltic Oil Gallon (Gal) [Liter (L)]
2.Any amount of Prime Coat asphaltic oil which is outside the specified property ranges of Table 517. 01, shall be paid for at the contract unit price multiplied by the pay factor determined in Table 517.01. If the resultant pay factor for the material indicates rejection as an option, the Engineer will determine if the non-compliant material will be removed.
Source: Nebraska Standard Specifications for Highway Construction, 2017 Edition. Pages 406–408 of 1,048.