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Re: Masonry mortar: Low Compression Results

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What is this?????
 
----- Original Message -----
Sent: Wednesday, October 13, 2004 5:06 AM
Subject: Masonry mortar: Low Compression Results

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<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>
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<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>
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