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 adjacent surfaces, either light on dark or dark on light. Acceptable colors for polymer panels shall be Federal Yellow #33538 and Federal Brick Red #22144 (or approved equals). Detectable warning panels shall have a uniform color.

 

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

 

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:

         Water Absorption - ASTM D 570 less than 0.2.

         Slip Resistance - ASTM C 1028 greater than 0.80.

         Compressive Strength - ASTM D 695 greater than 28,000 psi.

         Tensile Strength - ASTM D 638 greater than 11,600 psi.

         Flexural Strength - ASTM D 790 greater than 25,000 psi.

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

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

         Wear Resistance - ASTM C 501 greater than 500.

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

         Impact Resistance - ASTM D 5420 greater than 550 inch-pounds per inch.

         Accelerated Weathering - ASTM G 155 for 3000 hours, no fading or chalking.

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

         Freeze Thaw - ASTM C 1026 no cracking, delamination, or other defects.

         Salt Spray - ASTM B 117 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.

         Impact resistance - Resistance to impact from Falling Tub NCHRP Report 670: Draft T4-33, Part II. No Substantial damage.

         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.

         Impact resistance Resistance to impact from Falling Tub NCHRP Report 670: Draft T4-33, Part II. No Substantial damage.

         Meet Article 4153.03.