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Re: Old Concrete

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> I am working on some projects rehabilitating older historic buildings from
> the 1920's.  There is some terminology in the original construction
> drawings
> that is a little confusing.
>
> Tar Concrete

I'm almost certain that's what we today call "Asphaltic Concrete" of the
type used even now for roadway surfacing.

> Gypsum Concrete

Sounds like good ol' "Gyp-crete":

http://www.johnbridge.com/vbulletin/archive/index.php/t-1804.html

> Cinder Concrete

Hm. Could this be the "ancient" equivalent of our modern Portland Cement
concrete with fly-ash added?

Don't know.

> Gritcrete

The only thing I can think of is "sand-lightweight concrete" or concrete
with fine aggregate only.

>
> Any clarifications on strength, unit weight and uses would be helpful.
> Thanks in advance.

Depends. You can probably consult someone at e.g. Wiss, Janney, Elstner
(http://www.wje.com/) or Construction Technology Laboratories
(http://www.ctlgroup.com/) to give you a quick-and-dirty range for these.

However, if you're looking to do actual construction or renovation,
retaining these materials you need to engage a firm to do the testing and
come up with "real" numbers for this.

Depends on your application.


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