Section 4171.  Detectable Warnings

4171.01     DESCRIPTION.

Detectable warning panels shall be modular and/or prefabricated composite polymer, cast iron, or steel. 

4171.02     general.

A. Detectable warning panels shall meet the requirements of American with Disabilities Act Accessibility Guidelines (ADAAG).

B.    Anchors used in detectable warning panels shall meet the minimum dome size requirements when anchors are located where they replace a dome.

C.    Surface applied detectable warning panels shall have an adhesive and mechanical attachment to the hard surface.

D.    Detectable warnings shall contrast visibly with adjoining surfaces, either light on dark or dark on light. Acceptable colors for panels shall be Federal Yellow #33538 and Federal Brick Red #22144 (or approved equals). Detectable warning panels shall have a uniform color. Surface applied coating shall be applied to panel at time of manufacture and shall be powder type and baked on the surface per manufacturer’s recommendations. Field-applied surface coatings and/or paint will not be acceptable.

E.    Variations from dimensions shown in contract documents shall be no more than 1/8 inch (3 mm).

4171.03     polymer detectable warning panels.

Detectable warning panels with truncated dome inserts in prefabricated panels of vitrified polymer shall include integral embedment flanges for securing the panels to the concrete. Embedment flange cells shall include vent holes for a cast in place installation. Panels shall meet the following specifications:

· Warpage of Edge - 0.5% maximum.

· Water Absorption - ASTM D 570-98 less than 0.05% 0.2.

· Slip Resistance - ASTM C 1028-96 greater than 0.80.

· Compressive Strength - ASTM D 695-02a greater than 28,000 psi (193 MPa).

· Tensile Strength - ASTM D 638-03 greater than 19,000 11,600 psi (131 80 MPa).

· Flexural Strength - ASTM D 790-03 greater than 25,000 psi (172 MPa).

· Chemical Stain Resistance - ASTM D 543-95 no discoloration or staining.

· Abrasive Wear - ASTM D 2486-00 less than 0.060 after 1000 cycles.

· Wear Resistance - ASTM C 501-84 greater than 500.

· Fire Resistance - ASTM E 84-05 flame spread less than 15 20.

· Impact Resistance - ASTM D 5420-04 greater than 550 inch-pounds per inch (24.5 J/cm).

· Accelerated Weathering - ASTM G 155-05a for 3000 hours ΔE<4.5 tile color 33538, no fading or chalking.

· Accelerated Aging Cycle testing - ASTM D 1037 no change in color, gloss or delamination.

· Freeze Thaw - ASTM D 1037-99 1026 no cracking, delamination, or other defects.

· Salt Spray - ASTM B 117-03 for 200 hours or no deterioration after 200 hours of exposure.

4171.04     Cast iron detectable warning panels.

Detectable warning panels with truncated dome inserts in cast iron panels shall meet the following requirements:

· Slip resistance - ASTM C 1028 greater than 0.8.

· Tensile strength of gray cast iron conforming to ASTM A 48.

· Wear resistance - ASTM A 532 C 501 greater than 8500.

· Impact resistance - ASTM A 327 greater than 550 inch-pounds per inch (24.5 J/cm). Resistance to impact from Falling Tub NCHRP Report 670: Draft T4-33, Part II. No Substantial damage.

· Warpage of edge 0.5% maximum.

· Meet Article 4153.04.

4171.05     steel detectable warning panels.

Detectable warning panels with truncated dome inserts in steel panels shall meet the following requirements:

· Slip resistance - ASTM C 1028 greater than 0.8.

· Wear resistance - ASTM A 532 C 501 greater than 8500.

· Impact resistance - ASTM A 327 greater than 550 inch-pounds per inch (24.5 J/cm). Resistance to impact from Falling Tub NCHRP Report 670: Draft T4-33, Part II. No Substantial damage.

· Warpage of edge 0.5% maximum.

· Meet Article 4153.03.