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RE: Masonry mortar: Low Compression Results

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Jason Kilgore
Leigh & O'Kane, LLC
Kansas City, Missouri
________________________________________
From: Junata [mailto:multiconst(--nospam--at)sby.centrin.net.id] 
Sent: Tuesday, October 12, 2004 8:16 PM
To: seaint(--nospam--at)seaint.org
Subject: Re: Masonry mortar: Low Compression Results

What is this?????
 
----- Original Message ----- 
From: hadiprawira djohan 
To: seaint(--nospam--at)seaint.org 
Sent: Wednesday, October 13, 2004 5:06 AM
Subject: Masonry mortar: Low Compression Results

<DIV>
<P class=MsoNormal style="MARGIN: 0in 0in 0pt"><FONT face="Times New Roman"
size=3>Fellow Engineers,</FONT></P>
<P class=MsoNormal style="MARGIN: 0in 0in 0pt"><FONT size=3><FONT
face="Times New Roman">&nbsp;<?xml:namespace prefix = o ns =
"urn:schemas-microsoft-com:office:office" /><o:p></o:p></FONT></FONT></P>
<P class=MsoNormal style="MARGIN: 0in 0in 0pt"><FONT face="Times New Roman"
size=3>Recently, I received many low compressive results for masonry mortar
testing. Most of the low results were found with the brick mortar. I
specified Type S mortar, which should have 1800 psi strength, yet the result
came back as low as 900 psi. </FONT></P>
<P class=MsoNormal style="MARGIN: 0in 0in 0pt"><FONT size=3><FONT
face="Times New Roman">&nbsp;<o:p></o:p></FONT></FONT></P>
<P class=MsoNormal style="MARGIN: 0in 0in 0pt"><FONT face="Times New Roman"
size=3>This project is an 8 story CMU structure with a brick façade. There
is a relieving angle placed at each floor to carry the brick
load.</FONT></P>
<P class=MsoNormal style="MARGIN: 0in 0in 0pt"><FONT size=3><FONT
face="Times New Roman">&nbsp;<o:p></o:p></FONT></FONT></P>
<P class=MsoNormal style="MARGIN: 0in 0in 0pt"><FONT face="Times New Roman"
size=3>The following are my questions:</FONT></P>
<OL style="MARGIN-TOP: 0in" type=1>
<LI class=MsoNormal style="MARGIN: 0in 0in 0pt; mso-list: l0 level1 lfo1;
tab-stops: list .5in"><FONT face="Times New Roman" size=3>Since the brick is
supported at every floor, should I settle with Type N mortar (750 psi)? What
is the standard mortar type for a one-floor brick wall
structure?</FONT></LI>
<LI class=MsoNormal style="MARGIN: 0in 0in 0pt; mso-list: l0 level1 lfo1;
tab-stops: list .5in"><FONT face="Times New Roman" size=3>Is there any
impact of the low strength compression in the long run? Will lower mortar
strength cause premature repointing?</FONT></LI>
<LI class=MsoNormal style="MARGIN: 0in 0in 0pt; mso-list: l0 level1 lfo1;
tab-stops: list .5in"><FONT face="Times New Roman" size=3>The material
testing company used a plastic form, which doesn?t allow any water
absorption compared to brick, thus the plastic form resulted in a higher
water content than the actual condition. Is it possible that the cause of
the low compression is due to the method of the sampling? </FONT></LI>
<LI class=MsoNormal style="MARGIN: 0in 0in 0pt; mso-list: l0 level1 lfo1;
tab-stops: list .5in"><FONT face="Times New Roman" size=3>Is there any
insitu testing that can be performed to verify mortar compressive strength
other than winsor-pro?</FONT></LI>
<LI class=MsoNormal style="MARGIN: 0in 0in 0pt; mso-list: l0 level1 lfo1;
tab-stops: list .5in"><FONT face="Times New Roman" size=3>Did anyone
encounter this situation before, and what was your course of action as the
EOR?</FONT></LI></OL>
<P class=MsoNormal style="MARGIN: 0in 0in 0pt"><FONT size=3><FONT
face="Times New Roman">&nbsp;</FONT></FONT><SPAN style="FONT-SIZE: 12pt;
FONT-FAMILY: 'Times New Roman'; mso-fareast-font-family: 'Times New Roman';
mso-ansi-language: EN-US; mso-fareast-language: EN-US; mso-bidi-language:
AR-SA">Any thought counts! Thank you as always?</SPAN></P>
<P class=MsoNormal style="MARGIN: 0in 0in 0pt"><SPAN style="FONT-SIZE: 12pt;
FONT-FAMILY: 'Times New Roman'; mso-fareast-font-family: 'Times New Roman';
mso-ansi-language: EN-US; mso-fareast-language: EN-US; mso-bidi-language:
AR-SA"></SPAN>&nbsp;</P><SPAN style="FONT-SIZE: 12pt; FONT-FAMILY: 'Times
New Roman'; mso-fareast-font-family: 'Times New Roman'; mso-ansi-language:
EN-US; mso-fareast-language: EN-US; mso-bidi-language: AR-SA"></SPAN></DIV>
<DIV><SPAN style="FONT-SIZE: 12pt; FONT-FAMILY: 'Times New Roman';
mso-fareast-font-family: 'Times New Roman'; mso-ansi-language: EN-US;
mso-fareast-language: EN-US; mso-bidi-language: AR-SA">Djohan</SPAN></DIV>
<DIV><SPAN style="FONT-SIZE: 12pt; FONT-FAMILY: 'Times New Roman';
mso-fareast-font-family: 'Times New Roman'; mso-ansi-language: EN-US;
mso-fareast-language: EN-US; mso-bidi-language: AR-SA">Brooker Engineering,
NY.</SPAN></DIV>
<P class=MsoNormal style="MARGIN: 0in 0in 0pt"><BR></P>
<BLOCKQUOTE class=replbq style="PADDING-LEFT: 5px; MARGIN-LEFT: 5px;
BORDER-LEFT: #1010ff 2px
solid">&nbsp;</BLOCKQUOTE><p>_______________________________________________
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