312 ALASKA 2020 SECTION 614 CONCRETE BARRIER
614-1.01 DESCRIPTION . Furnish and install concrete barrier.
614-2.01 MATERIALS. Use materials that conform to the following:
Concrete Section 550, Class B Reinforcing Steel and Wire Rope Subsection 709- 2.01 Retroreflective Sheeting Material ASTM D 4956, Type III, IV, or V Reflector Assemblies Side-mounted or top- mounted as shown on the Plans.
614-3.01 CONSTRUCTIO N REQUIREMENTS. Use precast or cast -in-place concrete barrier
meeting the lines, dimensions, and requirements shown on the Plans. Give all exposed surfaces a smooth finish. Where the concrete barrier is not placed on pavement, shape, compact, and finish the supporting material to the lines and grades shown on the Plans or as directed. Attach reflector assemblies to concrete barriers accordin g to the manufacturer’s recommendations at 50- foot intervals on the side(s) and top as shown in the Plans. Reflector assemblies are required on both sides of median barriers.
614-4.01 METHOD OF M EASUREMENT. See Section 109.
Each. Per concrete barrier segm ent, 12.5 foot nominal length.
614-5.01 BASIS OF PA YMENT. Reflector assemblies and hardware required to install the barrier
are subsidiary. Unless otherwise noted, all material required to widen embankment for concrete barrier as detailed in the Plans and Special Provisions will be measured and paid for under the appropriate pay items shown in the bid schedule. Payment will be made under: PAY ITEM Item Number Item Description Unit 614.0001.____ Concrete Barrier LF 614.0002.____ Concrete Barrier EACH 313 ALASKA 2020 SECTION 615 STANDARD SIGNS
615-1.01 DESCRIPTION . Furnish and install standard signs and delineators. Remove and
relocate or remove and dispose of existing signs and markers, as specified.
615-2.01 MATERIALS. Use materials that conform to the following Subsections:
Sheet Aluminum 730-2.01 High Density Overlaid Plywood 730-2.02 Retroreflective Sheeting 730-2.03 Sign Posts 730-2.04 Delineator Posts 730-2.05 Acrylic Prismatic Reflectors 730-2.06 Sign Support Fasteners 730-2.07
1.Shop Drawings . Submit shop drawings, for all signs that must meet the ASDS letter width and spacing charts, for approval before fabrication. Submit 4 sets of collated shop drawings prepared according to Subsection 105- 1.02. Show the following on each sign drawing:
a.Dimensions of al l horizontal and vertical characters and spaces
b.Overall dimensions
c.Sign material and sheeting material type
d.Panel thickness
e.Legend and letter series
f.Whether the sign will be framed
2.Sign Fabrication. Use ASTM D4956 Type IV retroreflective sheeting (for lett ering, symbols, borders, and background) on sheet aluminum panels for all signs except the following:
a.Orange Background Signs : Use ASTM D4956 Type VIII, IX, or XI fluorescent orange retroreflective sheeting. For temporary installations, place reflective sheeting on sheet aluminum, plastic, or plywood panels. For Roll -Up signs use 3M series RS 24, Reflexite Marathon Orange, or approved equal (based on durability and reflectivity, as determined by the Engineer). Use flexible signs with fluorescent retroref lective sheeting that is ASTM D4956 Type VI or better.
b.Railroad Crossbucks and Vertical Crossbuck Supports : Use white ASTM D4956 Type VIII, IX, or XI retroreflective sheeting for background of sign and all strips.
c.Non- Illuminated Overhead Signs with White Legends on Green Backgrounds : Use ASTM D4956 Type IX, or XI retroreflective sheeting for legends and background. Create the legend in one of the following ways:
1.Cut border and legend from white ASTM D4956 Type IX, or XI retroreflective sheeting and adhere them to a green ASTM D4956 Type IX background, or
2.Cut stencil of border and legend out of green transparent acrylic film and use transparent adhesive to overlay the film on a white ASTM D4956 Type IX, or XI retroreflective background.
Source: Alaska Standard Specifications for Highway Construction, 2020 Edition. Pages 340–340 of 584.