Group no. Water submergence (days) 2 5 14 28 90 180 Average maximum load before failure (lb) 44086 88171 126,390 146,970 170464 183,690
6′′ * 12′′ concrete cylinders were made of the same batch and separated at random to six equal groups. The six groups of cylinders were submerged in water for different times before testing for compressive strength and the results are shown in Table . 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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