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RE: Masonry Cement

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There was an article in the August 1996 issue of "Masonry Construction"
which discussed the evolution of mortar and masonry cement and the reasons
for their prohibition in the UBC and some other building codes. According to
the author, most of the opposition to mortar and masonry cement came from
the lime industry, presumably because the other products cut into its
market. 

At the time the restrictions were written into the code, there was concern
about lower bond strength for these products, but it sounds like these
concerns have largely been addressed through testing and improved
formulation. Beyond this article's comments, I'm as much in the dark as you
are.

-----Original Message-----
From: Domenic DeAngelo [mailto:domdean(--nospam--at)mediaone.net]
Sent: Thursday, August 10, 2000 6:28 AM
To: seaint(--nospam--at)seaint.org
Subject: Re: Masonry Cement


Section 2104.4.6 of the Massachusetts State Building Code (6th Edition)
states "Material Requirement: Neither Type N mortar  nor masonry cement
shall be used as part of the lateral force resisting system."

The masonry subcontractor on a job wants to use  pre-proportioned blend of
masonry cement that meets the requirements of C-150 for the Portland cement
and C-207 for the hydrated lime. The mix (with mason's sand) produces a
masonry mortar that conforms to ASTM C-270 Type S.

Two questions:

Does anyone know why "masonry cement" was put into Section 2104.4.6?

Can the contractor use the pre-packaged mix?

Thanks in advance,

Domenic W. DeAngelo P.E.


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