Four standard concrete cylinders of 6-inch diameter cross section were tested under uniformly increasing axial compressive loads 28 days after casting concrete. The maximum measured loads were 121,000 lbs, 116,700 lbs, 128,800 lbs, and 119,100 lbs. What is the average compressive strength of this concrete in ksi?

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Q: Magnitude of shrinkage strains depends upon the composition of the concrete.

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