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RE: Masonry Cement

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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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