Launch Slideshow

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49 CONTINENTAL MATERIALS CORP. /CHICAGO

Holding company operates in two industries: Construction Products and HVAC. Its Concrete, Aggregates, and Construction Supplies division includes Castle Concrete and Transit Mix Concrete in Colorado. Sold Denver-based subsidiary, Rocky Mountain Ready Mix Concrete, in July 2009.

50 SCHWAB INDUSTRIES / DOVER, OHIO

Oldcastle Materials bought Schwab's ready-mix, block, and aggregates facilities in 2010: Twin Cities Concrete, Quality Block and Supply, and Medina Supply in Ohio and Schwab Ready-Mix and Eastern Cement in Florida.

51 ANGELLE CONCRETE / JENNINGS, LA.

Founded in 1947, Angelle has dry-batch plants and cement terminals in south-central Louisiana. Also operates as Delta Concrete and South Louisiana Cement. www.angelleconcrete.com

$51 MILLION TO $100 MILLION

52 CLARK PACIFIC / WEST SACRAMENTO, CALIF.

The producer's engineers and precast experts specialize in architectural precast systems, design/build parking solutions, seismic technological advances, and custom architectural finishes. www.clarkpacific.com

53 DOLESE BROS. CO. / OKLAHOMA CITY

Began a century ago building streets, sewers, and other public projects in the Chicago area. The producer now has ready-mix and block plants, and aggregate operations in Oklahoma and Louisiana. www.dolese.net

54 SUPERIOR READY MIX CONCRETE / ESCONDIDO, CALIF.

Supplies customers with concrete, aggregates, and asphalt from more than 20 locations. Also operates a construction supply yard with block, decorative rock, sand, tools, and building materials. www.superiorrm.com

55 R.W. SIDLEY INC. / PAINESVILLE, OHIO

The ready-mix, concrete block, and structural precast producer also offers bulk aggregates, industrial minerals, and building supplies. Subsidiary J.P. Jenks Trucking and Warehousing distributes heavy- and medium-duty trucks. www.rwsidley.com

56 TEICHERT INC. / SACRAMENTO, CALIF.

Adolph Teichert, a German immigrant, founded the company in 1887. Teichert Materials produces ready-mix and precast concrete; Teichert Aggregates is one of the largest aggregate producers in the nation. www.teichert.com

57 UNISTRESS CORP. / PITTSFIELD, MASS.

Precast and prestressed producer has its own onsite central mix concrete operation and Unistress Steelworks manufactures 99% of its own steel components. Unistress recently invested $1 milion in solar panels to improve energy efficiency. www.unistresscorp.com

58 CRANESVILLE BLOCK CO. / AMSTERDAM, N.Y.

One of New York's original block and precast producers, also produces its own sand and stone. Supplied material for the new Route 17 bypass in Parksville, N.Y., in 2009. The $92.7 milion project includes 13 new precast bridges. www.cranesville.com