Civil Engineering Materials #$6\mathrm{.}17$

Students in the materials class prepared three mortar mixes with water to cement ratios of $0\mathrm{.}50,0\mathrm{.}55,$ and $0\mathrm{.}60.$ Three $2-$in$.$ mortar cubes were prepared for each mix. The cubes were cured for $7$ days and then tested for compressive strength. The test results were as shown in Table.

Determine the following:

The compressive strength of each cube.

The average compressive strength for each mix.

Plot the average compressive strength versus $\frac{w}{c}$ ratios for all mixes.

Comment on the effect of increasing $\frac{w}{c}$ ratio on the compressive strength of the cubes.