SCEBs - University of Colorado Boulder
SCEBs - University of Colorado Boulder
SCEBs - University of Colorado Boulder
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3.9. Modulus <strong>of</strong> Rupture: Three-Point Bending Test<br />
<strong>SCEBs</strong> must be able to resist a certain amount <strong>of</strong> bending or flexural stress.<br />
Induced bending stresses could result from differential settlement <strong>of</strong> the foundation, point<br />
loads in the mortar, or other sources. The modulus <strong>of</strong> rupture (MOR) quantifies a SCEB‟s<br />
ability to resist bending stress. A modulus <strong>of</strong> rupture test is specified in Section K<br />
14.7.4.23 <strong>of</strong> the New Mexico Earthen Building Materials Code which specifies a<br />
minimum strength <strong>of</strong> 50 psi. The procedure outlined in Section K was followed as<br />
closely as possible.<br />
):<br />
To determine flexural stress ( f<br />
MOR<br />
Figure 3.14: 110-kip MTS Machine<br />
3 P<br />
f<br />
psi <br />
2<br />
P f<br />
L<br />
b<br />
t<br />
<br />
2 b t<br />
<br />
<br />
<br />
L<br />
Force at failure [lbs]<br />
Length <strong>of</strong> support span [in]<br />
Width [in]<br />
Thickness [in]<br />
Figure 3.15: MOR test set-up<br />
27
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