Consider the following results of compression test for twelve 28-day concrete cylinder samples from a particular mix batch during construction. (Note: The data are expressed in psi. The minimum required 28-day compressive strength of concrete for the particular construction project is 3000 psi). 3031 3112 3063 2965 2994 3002 2895 3218 2780 2954 3015 2940 (a) Determine the mean and median of the given data. (b) Determine the range, standard deviation, and coefficient of variation of the given data. (c) According to ACI 318 standard, the concrete samples are adequately cured for testing if the average strength of the samples is at least 85% of the target compressive strength. Does the given result satisfy this requirement? (d) According to ASTM C39 standard, the coefficient of variation of a given compression test result for concrete testing must not exceed 3.2% for it to be acceptable. Does the given result satisfy this requirement? -
Consider the following results of compression test for twelve 28-day concrete cylinder samples from a particular mix batch during construction. (Note: The data are expressed in psi. The minimum required 28-day compressive strength of concrete for the particular construction project is 3000 psi). 3031 3112 3063 2965 2994 3002 2895 3218 2780 2954 3015 2940 (a) Determine the mean and median of the given data. (b) Determine the range, standard deviation, and coefficient of variation of the given data. (c) According to ACI 318 standard, the concrete samples are adequately cured for testing if the average strength of the samples is at least 85% of the target compressive strength. Does the given result satisfy this requirement? (d) According to ASTM C39 standard, the coefficient of variation of a given compression test result for concrete testing must not exceed 3.2% for it to be acceptable. Does the given result satisfy this requirement? -
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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Transcribed Image Text:Consider the following results of compression test for twelve 28-day
concrete cylinder samples from a particular mix batch during
construction. (Note: The data are expressed in psi. The minimum
required 28-day compressive strength of concrete for the particular
construction project is 3000 psi).
3031
3112
3063
2965
2994
3002
2895
3218
2780
2954
3015
2940
(a) Determine the mean and median of the given data.
(b) Determine the range, standard deviation, and coefficient of variation
of the given data.
(c) According to ACI 318 standard, the concrete samples are adequately
cured for testing if the average strength of the samples is at least 85% of
the target compressive strength. Does the given result satisfy this
requirement?
(d) According to ASTM C39 standard, the coefficient of variation of a
given compression test result for concrete testing must not exceed 3.2%
for it to be acceptable. Does the given result satisfy this requirement? -
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