ASR in concrete

[JBASE]

We have an elevated tennis court, 6 years old, constructed of 2" metal deck with 4" total thickness of concrete. There is severe ASR finish damage. We want to resurface the concrete by removing +/-1 inch of concrete and replacing with a fully bonded concrete finish. Our concern is the ASR will remain in the original concrete and bond to the new concrete, temporarily. Between the micro cracking damage caused by the concrete removal and the fact that this is an exterior deck, we believe the ASR will continue to react and create additional damage after resurfacing. Our second choice is to remove the concrete and metal deck and begin from scratch. The concrete fill is non-structural as the metal deck meets vertical and lateral requirements as a bare deck. Has anyone been faced with resurfacing over ASR contaminated concrete and if so, was it successful?

 

[KootK]

If it's really ASR, I think that she's gotta go. Out of curiosity, how good of a tennis surface is it? Bouncy?

The greatest trick that bond stress ever pulled was convincing the world it didn't exist.

 

[RHTPE]

An exterior elevated slab on metal deck and the slab is non-structural? I don't know the environment, but I would be leery about the life expectancy of the metal deck, galvanized or not. The slab should be reinforced if it is exposed to the outside environment.

As far as the ASR - that slab has to go. Placing a topping over it is just asking for a repeat performance in a few years.


Ralph
Structures Consulting
Northeast USA

 

[JBASE]

We have the lab report, it is textbook. I have not played on the court, only walked it and surprisingly, pretty rigid. It is quite a sight, originally constructed with glulam timbers, I-joists and a plywood deck with concrete overlay. Six years ago they pulled the I-joists and plywood deck and installed long span bar joists...from the glulams...and the metal deck with LWC fill. I just advised the owner the metal deck and concrete fill would have to be replaced. Too much liability to "try something".