a. How does one obtain a concrete sample from a batch in accordance with ASTM C172? b. When is it necessary to perform wet sieving according to method C172? c. Test method C143 is applicable to plastic concrete having coarse aggregate up to 37.5 mm in size. Will it be possible to perform slump test if coarse aggregate used is larger than 37.5 mm? How? d. Briefly discuss the procedure for filling up the slump cone with fresh concrete sample. e. Which one among the test methods in determining air content of freshly mixed concrete is most appropriate to determine air content of concretes containing lightweight aggregates? f. What is the purpose of adding alcohol in test method C173? g. When is it necessary to consolidate concrete by vibration in test method C231? Discuss the process of vibration when placing and consolidating the sample. h. When rodding a layer of concrete in method C138, is it okay to hit the bottom of the measure? If not, how is it supposed to be done? i. Calculate the yield of concrete if the mass of the batch is 4800 kg and its density is found to be 350 kg/m3. j. Discuss the procedure for determining the temperature of freshly mixed concrete. k. How does one determine the diameter of a concrete cylinder specimen to be used in calculating its cross-sectional area? l. Explain how to measure the length of a concrete cylinder specimen. m. When will the counting of test age for concrete cylinder specimens start according to method C39? n. Is it permitted by method C78 to inscribe identification marks on concrete beam specimens? Why? Why not? o. How does one measure the dimensions of the beam specimen cross section? p. What are the reasons for the conduct of test method C42? q. Discuss briefly the test method C805. r. Discuss briefly the test method C803. s. Discuss briefly the test method C900. t. Discuss briefly the test method C597.
a. How does one obtain a concrete sample from a batch in accordance with ASTM C172?
b. When is it necessary to perform wet sieving according to method C172?
c. Test method C143 is applicable to plastic concrete having coarse aggregate up to 37.5 mm in size.
Will it be possible to perform slump test if coarse aggregate used is larger than 37.5 mm? How?
d. Briefly discuss the procedure for filling up the slump cone with fresh concrete sample.
e. Which one among the test methods in determining air content of freshly mixed concrete is most
appropriate to determine air content of concretes containing lightweight aggregates?
f. What is the purpose of adding alcohol in test method C173?
g. When is it necessary to consolidate concrete by vibration in test method C231? Discuss the process
of vibration when placing and consolidating the sample.
h. When rodding a layer of concrete in method C138, is it okay to hit the bottom of the measure? If not,
how is it supposed to be done?
i. Calculate the yield of concrete if the mass of the batch is 4800 kg and its density is found to be 350
kg/m3.
j. Discuss the procedure for determining the temperature of freshly mixed concrete.
k. How does one determine the diameter of a concrete cylinder specimen to be used in calculating its
cross-sectional area?
l. Explain how to measure the length of a concrete cylinder specimen.
m. When will the counting of test age for concrete cylinder specimens start according to method C39?
n. Is it permitted by method C78 to inscribe identification marks on concrete beam specimens? Why?
Why not?
o. How does one measure the dimensions of the beam specimen cross section?
p. What are the reasons for the conduct of test method C42?
q. Discuss briefly the test method C805.
r. Discuss briefly the test method C803.
s. Discuss briefly the test method C900.
t. Discuss briefly the test method C597.
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