9.6 Refer to the following pictures and identify the likely cause of concrete cracking from the following list. Shrinkage crack Concrete expansion crack Bending flexural stress crack Beams shear crack - Crazing or premature drying crack a b) f).

A hot rolled steel tension test sample has a diameter of 6 mm and the original gage length of 30 mm. In a test to fracture, the stress and strain data below were obtained. Determine Generic Strain Value, %0.2 offset strain, and Calculated stress at %0.2 offset. Original diameter - 6mm Original Length - 30 mm Fracture diameter - 4.54 mm

The concrete beam shown below is made of an all-lightweight concrete with a unit weight 7=/ 800 kg/ ni a. Compute the value of the cracking moment and b. Estimate the value of the concentrated load P at midspan that causes the beam to crack (include the dead weight of the beam). f, =27.5 MPa 100 mm P=? Wbeam 2-D25 - 5 m 100 mm 100 mm 300 mm

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