Question

If your contractor poured one hundred lineal feet (30.5 lineal meters) of concrete, you might expect it to shrink in length by about 1/4", 3/4", or 1-1/2"? (6.3, 19, or 38 millimeters?)

Answer

A good mix design without excessive water will shrink about 3/4" per 100 lineal feet (19 millimeters per 30.5 meters, or .62 millimeters per meter).