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Modulus of rupture (third-point)
Modulus of rupture (third-point)
ASTM C78 · AASHTO T 97
Explained in
Portland Cement Flexural Strength
Calculator
Modulus of rupture (third-point)
ASTM C78 · AASHTO T 97
Units
US customary
SI (metric)
Maximum load, P
, lbf
Span length, L
, in.
Average width, b
, in.
Average depth, d
, in.
Where it broke
Within the middle third
Outside the middle third
Distance from break to nearer support, a
, in.
Calculate
Example values. Your agency’s specification sets the limits.
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