39 NEBCO INC. / LINCOLN, NEB.
Began as the Abel Construction Co. in 1908 and expanded to make ready-mixed concrete, concrete pipe, and block. The producer now has an account on LinkedIn. www.nebcoinc.com
40 CRETEX COMPANIES / ELK RIVER, MINN.
Cretex Concrete Products Group grew in June 2010 when it acquired Concrete Products of Wyoming, a producer of reinforced concrete pipe and precast products. www.cretexinc.com
41 ALLEY-CASSETTY BRICK & BLOCK / NASHVILLE, TENN.
The concrete block producer began as a small retail coal business in the 1880s; still operates a commercial and industrial coal division, and a trucking division. www.alley-cassetty.com
42 HIGH CONCRETE GROUP / DENVER, PA.
This precast producer promotes “more sustainable precast,” including the CarbonCast line of C-GRID carbon fiber reinforced products and ECast with weight-saving aggregates. www.highconcrete.com
43 HARPER INDUSTRIES / PADUCAH, KY.
Operates in Kentucky, Tennessee, and Texas. President Billy Harper is a professional racecar driver on the National and International Hot Rod Association circuits. www.harper1.com
44 THOMAS CONCRETE INDUSTRIES / ATLANTA
Has four concrete laboratories and more than 40 plants in Georgia and the Carolinas. Every employee must complete Thomas Concrete Academy, an in-house concrete “basic training.” www.thomasconcrete.com
45 TINDALL CORP. / SPARTANBURG, S.C.
The precast/prestressed producer's Conley, Ga., plant received a 2009 Energy Champion Award from the U.S. Department of Energy; one of only 47 plants in the U.S. to receive the recognition. www.tindallcorp.com
46 HOLLIDAY ROCK / UPLAND, CALIF.
In 2009, supplied concrete for a $165 million San Bernardino I-10 restoration project. The producer's rapid-set mix design allowed serviceability within four hours of placement. www.hollidayrock.com
47 ERNST ENTERPRISES / DAYTON, YTON, OHIO
Third-generation, family-owned ready-mix producer also sells construction materials including finishing tools, rebar and wire mesh, expansion joints, and concrete cures and sealers. www.ernstconcrete.com
48 FABCON INC. / SAVAGE, MINN.
Earned a safety award in 2009 for operating an entire year without a single workday lost due to employee injury or illness in its Ohio operations. Also has plants in Minnesota, Pennsylvania, and Indiana. www.fabcon-usa.com