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RE: Masonry Cement

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For field testing, ASTM C270 is a measure of consistency but it does report
a measure that is described as the compressive strength of the mortar.  The
result is not a legitimate measure of strength but it tends to be used as
one.  There doesn't seem to be any good test for mortar or masonry
assemblies, prism tests are certainly not good tests.

Roger C. Davis
SDS Architects, Inc.

-----Original Message-----
From:	Sherman, William [mailto:ShermanWC(--nospam--at)]
Sent:	Friday, June 29, 2001 5:56 PM
To:	'seaint(--nospam--at)'
Subject:	RE: Masonry Cement

Roger Davis wrote:

> With site mixed, many times you get mortar that is way to strong.  Masons
know that if
> the mortar is tested and the strength is low, they have a problem.  Hardly

> anyone will complain about being over-strength.  Pre-mixed should be
> closely in strength to what you specified.

But normally masonry mortar is not field tested, since there is no
established compressive strength for mortar in the field (i.e., ASTM C270
only applies to laboratory specimens). So why should masons be so concerned
with strength of site-mixed mortar?

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