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Reference:      A.S.T.M. C78

Procedure:     <Read this instruction carefully>


  1. Follow the procedure outlined in Section 5 of attached ASTM C78specifications
  2. Observe and record the maximum load.
  • Prepare a report covering the ten categories in section 8 of the specification.
    In addition the report should include a detailed sketch of the cracked specimen.


Write a professional lab report using the test results for all three teams

See this youtube video clip for ASTM beam test precedure: https://www.youtube.com/watch?v=TCfQdlriFAQ

ASTM C78 is also attached. Follow the test procedure from the ASTM document.


Please show all work and details with graph

The size of the specimen: L = 18 in          b = 6 in            d = 6 in


Draw SFD and BMD using the computer. Calculate the modulus of Rupture, R.

(R = PL/bd2)


Using the f’R = 7.5 * sqrt(f’c)

(please see the presentation slides), calculate the compressional strength.

Don’t forget to include all the calculations and lab procedure from the ASTM C78.













Modulus of Rupture: Formula Derivation

P/2                 P/2




L/3                                    L/3                   L/3



P/2                                                                   P/2


MOMENT AT CENTER SPAN:                           MOMENT OF INERTIA I□



M = P/2 * L/2  – P/2 * L/6                                                                   I□ =   bd3

12                                                                                                                                                         n.a.

M =P/2 *  L/3


M = PL/6                                                         MAXIMUM STRESS IN BEAM (modulus of rupture)

R= fc

















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