TABLE P7.39 Group no. Water submergence (days) Average maximum load before 1 3 4 6 3 7 14 28 90 180 189.6 379.1 543.5 632.0 733.0 789.9 failure (kN)
150 mm * 300 mm concrete cylinders were made of the same batch and sepa-
rated at random to six equal groups. The six groups of cylinders were sub-
merged in water for different times before testing for compressive strength
and the results are shown in Table P7.39.
It is required to do the following:
a. Determine the compressive strength at different curing times.
b. Using an Excel sheet, plot the relationship between curing time and
compressive strength. Label all axes and curves.
c. Comment on the effect of curing time on the compressive strength.
d. What is the approximate ratio between the compressive strengths at 7
days and 28 days?
e. What is the approximate ratio between the compressive strengths at 28
days and 180 days?
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