ASTM C78/C78M STANDARD TEST METHOD
FOR FLEXURAL STRENGTH OF CONCRETE
USING SIMPLE BEAM WITH THIRD-POINT
LOADING WITH ALL CORRECT & VERIFIED
ANSWERS
Many of the parameters which affect the ______ strength of concrete also apply to the ______
strength. Correct answer-compressive; flexural
T or F: Hand operated pumps can't be used in this testing method if they have pumps that don't
provide continuous loading at a uniform rate. Correct answer-True
Bearing blocks used in the ______ method must ensure that forces applied to the beam will be
perpendicular to the face of the specimen and applied without eccentricity. Correct answer-third
point loading
The testing equipment must be capable of maintaining distances between load-applying and support
blocks constant within ______. Correct answer-± 1 mm [0.05 in]
Load-bearing and support blocks must be in ______ with the ______. Correct answer-contact; rod
or ball
Test specimens should be smooth and free of ______, ______, ______, or ______. Correct answer-
scars, indentations, holes, or inscribed identification marks
T or F: In relation to the applied force, the loading system should be centered during the procedure.
Correct answer-True
During testing, if suitable contact is not made between the specimen and bearing block surfaces,
______, ______, or ______ may be required. Correct answer-grinding, capping, leather shims
It is acceptable to use leather shims only when the gap between the specimen ______ and the the
bearing blocks is not more than ______. Correct answer-surface; 0.40 mm [0.015 in]
To determine the average width, depth, and line of fracture location of the specimen, you should
take ______ measurements across each ______. Correct answer-three, dimension
T or F: Discard the test result if the fracture occurs outside of the middle third of the span length by
more than 5% of the total span length. Correct answer-True
T or F: If a fracture occurs at a capped section, you *should not* include the thickness of the cap in
your reporting. Correct answer-False
What formula measures the modulus of rupture at the middle third of the span length? Correct
answer-R = PL/bd²
The final report should include both the average width and depth to the nearest ______. Correct
answer-1 mm [0.05 in]
FOR FLEXURAL STRENGTH OF CONCRETE
USING SIMPLE BEAM WITH THIRD-POINT
LOADING WITH ALL CORRECT & VERIFIED
ANSWERS
Many of the parameters which affect the ______ strength of concrete also apply to the ______
strength. Correct answer-compressive; flexural
T or F: Hand operated pumps can't be used in this testing method if they have pumps that don't
provide continuous loading at a uniform rate. Correct answer-True
Bearing blocks used in the ______ method must ensure that forces applied to the beam will be
perpendicular to the face of the specimen and applied without eccentricity. Correct answer-third
point loading
The testing equipment must be capable of maintaining distances between load-applying and support
blocks constant within ______. Correct answer-± 1 mm [0.05 in]
Load-bearing and support blocks must be in ______ with the ______. Correct answer-contact; rod
or ball
Test specimens should be smooth and free of ______, ______, ______, or ______. Correct answer-
scars, indentations, holes, or inscribed identification marks
T or F: In relation to the applied force, the loading system should be centered during the procedure.
Correct answer-True
During testing, if suitable contact is not made between the specimen and bearing block surfaces,
______, ______, or ______ may be required. Correct answer-grinding, capping, leather shims
It is acceptable to use leather shims only when the gap between the specimen ______ and the the
bearing blocks is not more than ______. Correct answer-surface; 0.40 mm [0.015 in]
To determine the average width, depth, and line of fracture location of the specimen, you should
take ______ measurements across each ______. Correct answer-three, dimension
T or F: Discard the test result if the fracture occurs outside of the middle third of the span length by
more than 5% of the total span length. Correct answer-True
T or F: If a fracture occurs at a capped section, you *should not* include the thickness of the cap in
your reporting. Correct answer-False
What formula measures the modulus of rupture at the middle third of the span length? Correct
answer-R = PL/bd²
The final report should include both the average width and depth to the nearest ______. Correct
answer-1 mm [0.05 in]
