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[SEAOC] RE: [SEAOC] Durability of Lightweight concrete

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I do not have direct information pertaining directly to your question of
durability of lightweight concrete as a wearing surface but, I have
dealt with some thin polymer overlays that may perform will in this
instance.  They are again, at no small cost!  

The performance of these overlays on bridge decks has shown some merit.
The polymer overlays are basically a polymer concrete mixed with a
prebagged aggregate (usually pea gravel or sand) that is broadcast on
the surface of the polymer, this layer provides the skid resistance and
friction that would be required in this application.

There may be some suppliers that I may be able to recommend if you need
further information.

Brian Bellfi, "One of those bridge guys"
CH2M Hill
>From: 	Estes, Kent R.[SMTP:kent_estes(--nospam--at)]
>Sent: 	Thursday, September 05, 1996 4:56 PM
>To: 	'seaoc(--nospam--at)'
>Subject: 	[SEAOC] Durability of Lightweight concrete 
>I have a 30 year old lightweight concrete beamway in an amusement park
>that was never intended to bear direct vehicle traffic.  The ride that
>has now been removed ran on a steel rail bolted to the beamway.  The
>proposed vehicle will ride tires directly on the lightweight concrete.  
>The question is, how durable is lightweight concrete to tire traffic? 
>The prevailing wisdom from the literature that I have investigated (ACI,
>PCA, etc.) is muddled at best.  When durability of lightweight concrete
>is discussed, resistance to freeze/thaw cycles is usually all that is
>addressed.   At present, I have specified a cement-based overlay on the
>wear surface, but this is no small cost.  Any thoughts out there on the
>durability of lightweight concrete to tire traffic?  The vehicle is
>comparable to a car or truck.  Is it a common practice for bridges that
>use lightweight concrete to use it for the wearing surface?  Any good
>references that address this question?