Concrete Construction conducted a field test to learn more about shrinkage and curling in warehouse floors. A 60,000-square-foot warehouse floor in Bartlett, Ill., was divided into 5000- to 10,000-square-foot sections in mid-February 2009, each receiving a different mix design. Naturally, curling and movement changes varied in regard to the specific mix designs, as well as the ambient conditions, and each was monitored for the past two years. Our goal was to measure shrinkage, plot curling along joint lines, and moisture movement through the floor with different finishes during the curing cycle. See articles below.