drying shrinkage coefficient of the portland cement concrete (PCC) slab,
in/in (mm/mm). The coefficient depends on the indirect tensile strength,
lb/in2 (MPa) as follows: 0.0008 for 300 (2.1), 0.0006 for 400 (2.8),
0.00045 for 500 (3.4), 0.0003 for 600 (4.1), 0.0002 for 700 (4.8)