TABLE P7.38 Compressive Strength Test w/c Ratio Flexure Test Split Tension Test Compres- sive Strength (MPaа) Modulus Tensile of Rupture (MPa) Strength (MPa) Failure Failure Failure Load (kN) Load (kN) Load (kN) 0.50 204.2 18.6 237.2 0.55 141.7 12.2 216.1 0.60 110.5 10.0 191.1
Three batches of concrete were prepared using the same materials and ingredients, except that they have water–cement ratios of 0.50, 0.55, and 0.60,
respectively. The following tests were performed on specimens made of the
three batches:
■ Compressive strength test on 100 mm * 200 mm cylinders
■ Center-point flexure test on 100 mm * 100 mm * 300 mm beams
■ Split tension test on 150 mm * 300 mm cylinders
Three replicates were tested for each test. Table P7.38 shows the average failure loads for the three replicates of each case.
It is required to do the following:
a. Complete Table P7.38
b. Using an Excel sheet, plot the relationships between water–cement ratio
and compressive strength, modulus of rupture, and tensile strength on the
same graph. Label all axes and curves.
c. Comment on the effect of water–cement ratio on the compressive strength,
modulus of rupture, and tensile strength.
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