- 748 - SECTION 912 -- SPECIAL SURF ACE COURSE FOR MAILBOX TURNOUTS
912.01 Description
1.The Contractor shall furnish the materials, prepare the subgrade and/or shoulder, and construct a surface course for mailbox turnouts. This surface course shall be placed and compacted on the shoulder of the roadbed, adjacent to the surfacing, as described in the contract.
912.02 Material Requirements
1.The mailbox turnout surface course shall be constructed from asphaltic concrete material.
2.At the discretion of the Engineer, the following material may be used: a. Coarse aggregate that complies with the gradation requirements for Class "E" aggregate in Section 1033, Table 1033.03A.
b.Bituminous aggregate salvaged from an existing bituminous mat or asphalt millings.
c.Fresh bituminous aggregate. d. Any combination of the above approved in writing by the Engineer.
3.Salvaged material, at the time of placement, shall have been pulverized to comply with the following requirements: Min. Max. Total percent passing a 2 inch (50 mm) sieve 95 100 Total percent passing a 1 inch (25 mm) sieve 40 100
912.03 Construction Methods
1.The Contractor shall grade and shape the roadbed shoulder at the turnout location so the completed surface course will conform to the typical cross sections and dimensions shown in the contract.
2.a. The Contractor shall furnish and place any additional embankment necessary to complete the turnout to the typical cross section and dimensions shown in the contract.
b.Any additional embankment placed shall be compacted to conform to the requirements in Subsection 205.03, Paragraph 14.b.(2), Class "II" embankment.
3.This method of construction of the special surface course shall only apply to mailbox turnouts constructed with salvaged bituminous mat, asphalt millings, or coarse aggregate:
a.Aggregate, millings, and bituminous mat shall be placed in such quantities that the depth after com paction is equal to or greater than the minimum depth shown in the contract.
b.The materials shall be bladed to a uniform thickness over the described area. Special Surface Course for Mailbox Turnouts 912.05 - 749 - c. The materials shall be compacted with a roller weighing at least 275 pounds per inch (4.9 Kg/mm) of tread of the rolling wheels. In lieu of using such a roller, the compaction may be accomplished by repeated coverage with the rear wheels of a motorgrader or heavily loaded truck.
d.If coarse aggregates are used, the Engineer may require the addition of moisture to facilitate t he compaction of the surface course.
e.The compaction operations s hall be continued until the finished surface course is dense and stable.
4.Asphaltic concrete mix areas shall be compacted with at least 2 passes of an approved roller.
912.04 Method of Measurement
1.Special surface course for mailbox turnouts is measured by the square yard (square meter).
2.Aggregates will not be m easured and paid for separately.
912.05 Basis of Payment
1.P a y I t e m P a y U n i t Special Surface Course for Square Yard (SY) Mailbox Turnouts [Square Meter (m2)]
2.Asphaltic concrete, including PG Binder, is added to the quantities for those pay items.
3.Payment is full compensation for all work described in this Section. - 750 - SECTION 913 -- RIGHT-OF-WAY MARKERS
913.01 Description
1.The Contractor shall furnish, install, and relocate right-of-way markers as described in the contract.
913.02 Material Requirements
1.Concrete shall be Class 47BD-3,000 (47BD-20).
2.Reinforcing steel shall meet the requirements of Section 1020.
3.One or more markers shall be broken to facilitate a visual inspection of the quality and dimensio ns of the concrete and reinforcing steel.
913.03 Construction Methods
1.The Contractor shall install and /or relocate the right-of-way markers as indicated in the contract.
2.The forms shall be designed so the finished marker will conform to the dimensions shown in the contract.
3.Reinforcement shall be placed and wired in position so that the reinforcing steel will not be displaced during concrete placement and consolidation.
4.The concrete shall be thoroughl y consolidated by hand methods or mechanical vibration.
5.All surfaces shall be given an "Ordinary Surface Finish" in accordance with Subsection 704.03.
6.All markers cracked or broken in handling or delivery shall be rejected.
7.Markers removed during construction operations shall be stored near the site of removal and protected from all damage until they have been reset.
8.Excavation shall be made to the required depth and the markers set plumb and firm. The marker holes shall be at least 4 inches (100 mm) larger than each dimension of t he marker's base. The area shall be backfilled with suitable material compacted with mechanical or hand tampers.
913.04 Method of Measurement
1.The quantity of "Right-of-Way Ma rkers" is measured by the each.
2.The quantity of right-of-way mark ers that are reset is measured by the each.
913.05 Basis of Payment
1.Pay Item Pay Unit Right-of-Way Markers Each (ea) Reset Right-of-Way Markers Each (ea)
2.Removal of damaged markers shall be subsidiary to the marker pay item.
3.Payment is full compensation for all work described in this Section.
Source: Nebraska Standard Specifications for Highway Construction, 2017 Edition. Pages 782–783 of 1,048.