White-topping a sidewalk to correct cross slope?
White-topping a sidewalk to correct cross slope?
(OP)
A contractor built a sidewalk with cross slopes of up to 5.7%, instead of 2% max. Rather than make him rip out and replace the affected sections, could bonded white-topping work? It's mostly offset from the road, so curb height isn't a factor in most places.
What items would need attention? I'm assuming some surface preparation would be needed, and control joints need to coincide. If the minimum thickness is over 1/4"(6mm), panels would need to be replaced to transition to existing surfaces to remain. Anything else?
What items would need attention? I'm assuming some surface preparation would be needed, and control joints need to coincide. If the minimum thickness is over 1/4"(6mm), panels would need to be replaced to transition to existing surfaces to remain. Anything else?





RE: White-topping a sidewalk to correct cross slope?
RE: White-topping a sidewalk to correct cross slope?
First APPLY NO WATER!!!!
After roughening the surface,remove the dust by vcuum method. Leave it dry!!! If there is rain, wait until slab is bone dry.
Be on hand with a fresh paste made of Portland cement and water. Just before placing the overlay apply the paste to the surface and spread with a broom. That will enter the pores of old slab and be the bonding agent. Do this immediately ahead of grout or concrete placement. Do the usual moist curing for a week.
RE: White-topping a sidewalk to correct cross slope?
Oldestguy, do you concur?
RE: White-topping a sidewalk to correct cross slope?
Around here topping slabs may be poured thinner, e.g. parking garage topping slabs, but those are generally performed by competent contractors with significant experience bonding toppings to the base slab. I get a feel that if the contractor blows his slope by almost triple, it's unlikely he'll have the patience and skill to adequately bond a thin topping to and existing sidewalk.
RE: White-topping a sidewalk to correct cross slope?
It is better to have enough ideas for some of them to be wrong, than to be always right by having no ideas at all.
RE: White-topping a sidewalk to correct cross slope?
secondly, if you suggest any method to the contractor, they will blame you when it doesn't work. never make suggestions
tell them to replace it. or if they have some idea how to fix it, they need to come up with the method. then make a critical review of the method.
RE: White-topping a sidewalk to correct cross slope?
One way to check on my method is to cut come cores,and use a chisel to split them at the bond. My bet is it breaks at some other place. My experience is fixing up deteriorated parking garage decks. Should be about the same. Air entrained mix needed both places.
RE: White-topping a sidewalk to correct cross slope?
RE: White-topping a sidewalk to correct cross slope?
That seems to be the way local developers do it down here.
RE: White-topping a sidewalk to correct cross slope?
Richard A. Cornelius, P.E.
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