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Topping slab for ADA Ramp 1

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motherjoanne

Civil/Environmental
Joined
Nov 25, 2009
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Location
US
I am using a topping slab to remedy an access ramp that was improperly designed to ADAAG Standards. It is an exterior location on southern Oregon coast. We might have a freeze once a year but no frost to depth - lots of winter rain. Do I bond the new 3" (to a max of 6")topping slab to the old ramp? Do I need to use WWF or would fiber be okay. I am matching all control joints in old slab.
 
I would bond the new topping and would use WWF...unless you want to use steel fiber...I would not use polypropylene fiber for this application.

Clean and roughen the existing surface, use a bonding agent, then place the concrete.
 
Are you using detectable warning surface on the ramp? ADA standards in effect say the entire ramp requires it; current ADAAG (not "code") says the bottom 2' or so require the warning surface.
 
Can you hydro clean the surface and use one of the Sika bonded toppings? Do you have a requirement for 3" minimum? I'm not familiar with ADA or ADAAG standards.

Dik
 
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