51 ANGELLE CONCRETE GROUP / JENNINGS, LA.

Founded in 1947, this producer has grown through acquisitions and now operates 28 plants in central and southern Louisiana. It has made seven acquisitions since 1998, more than doubling its concrete manufacturing volume. www.angelleconcrete.com

$51 MILLION TO $100 MILLION

52 BOSTON SAND & GRAVEL CO. / BOSTON

This company is a recognized leader in the New England ready-mixed concrete and aggregate industry. Its product line includes lightweight, heavyweight, and high-strength concrete, flow fill, slurry concrete, and colored concrete. www.bostonsand.com

53 ALLEY-CASSETTY BRICK & BLOCK / NASHVILLE, TENN.

In business for more than 125 years, this company is recognized as one of Nashville's 110 largest private companies. Serving Tennessee, Kentucky, and Atlanta, it produces and distributes brick and other masonry products. www.alley-cassetty.com

54 DOLESE BROS. CO. / OKLAHOMA CITY

Employing more than 1000 people, this producer operates 45 ready-mix plants, more than 15 aggregate facilities, and two block plants. The company and its employees support 17 different organizations and charities. www.dolese.com

55 SUPERIOR READY MIX CONCRETE / ESCONDIDO, CALIF.

Family-owned producer provides concrete, aggregates, and asphalt to contractors and homeowners in Southern California. Product line includes block, decorative rock, sand, tools, and other building materials. www.superiorrm.com

56 UNISTRESS CORP. / PITTSFIELD, MASS.

Company designs, manufactures, and builds a variety of precast and prestressed concrete structures, bridges, roadways, retail and industrial structures. It primarily serves New England and the New York metro area. www.unistresscorp.com

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

With roots in mining and manufacturing, this company is a supplier of construction materials, including ready-mix concrete and masonry block. It has installed a coloring admixture measuring system for decorative concrete. www.rwsidley.com

58 NEBCO INC. / LINCOLN, NEB.

This third-generation family-owned and operated company supplies the construction industry in Nebraska with materials needed to construct buildings, streets, and highways. It employs 1000 people within 21 different companies. www.nebcoinc.com

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

John Tesiero Jr. founded the company in 1947 after returning from World War II. It remains family-owned and is one of the largest producers of ready-mixed concrete in New York State with 24 plants. www.cranesville.com

60 SPANCRETE / WAUKESHA, WIS.

This third-generation and family-owned provider of architectural and structural precast has manufactured products that have been used in LEED-recognized Sliver, Gold, and Platinum projects. www.spancrete.com

61 CLAYTON COMPANIES / LAKEWOOD, N.J.

Company has Clayton Concrete, Clayton Block, and Clayton Sand divisions. It also operates under the name Ralph Clayton & Sons. Also sells concrete retarder for decorative concrete. www.claytonco.com

62 MIDWEST PRODUCTS GROUP / JEFFERSON CITY, MO.

With 22 locations in six states, this company has several subsidiaries that manufacture and distribute concrete block, segmental retaining walls, pavers, brick, stone, and other masonry and landscape products. www.midwestproductsgroup.com

UP TO $50 MILLION

63 DELTA INDUSTRIES, INC. / JACKSON, MISS.

Parent company of 10 divisions supplies the mid-south region with ready-mix concrete and related products. Started with 22 Army surplus trucks in 1945; today it has a fleet of more than 200 trucks serving 30 locations. www.delta-ind.com

64 CONSUMERS CONCRETE CORP. / KALAMAZOO, MICH.

Serving Southwest Michigan from 33 facilities, this producuer manufactures, supplies, and recycles ready-mix concrete, concrete products, sand, and gravel. It is Michigan's largest producer of ready-mix and concrete block. www.consumersconcrete.com

65 STANDARD CONCRETE PRODUCTS / COLUMBUS, GA.

With four locations throughout Florida, Georgia, and Alabama, this producer designs and manufactures a wide variety of prestressed and precast concrete products for government and commercial use. www.standardconcrete.net

66 EMPRESAS MASTER / TOA BAJA, PUERTO RICO

Caribbean company was founded in 1987 and distributes and manufactures concrete, decorative, and paint products. Master Products segment includes QUIKRETE packaged concrete and related products. www.mastergroup-pr.com

67 BMC ENTERPRISES INC. / ST. LOUIS

This family-owned and operated company is a supplier of ready-mix concrete and building materials. One of the largest ready-mix producers in Missouri, it has more than 20 plants and a fleet of 200 ready-mix trucks. www.breckenridgematerial.com

68 CLARK PACIFIC / WEST SACRAMENTO, CALIF.

This West Coast precast company designs, manufactures, and installs state-of-the-art architectural precast building systems. In 2010, it received the PCI Design Award for Best Public/ Institutional Building. www.clarkpacific.com

69 EUCON CORP. / SPOKANE, WASH.

Locally owned construction materials supplier has three ready-mix locations, in addition to sand and gravel, and asphalt facilities. Its concrete division is Spokane Rock Products. www.spokanerock.com

70 SEQUATCHIE CONCRETE SERVICE INC. / SOUTH PITTSBURG, TENN.

Family-operated producer supplies concrete construction materials to Tennessee, Alabama, and Georgia. In 2010, projects included the Volkswagen assembly plant in Chattanooga, Tenn. www.seqconcrete.com

71 MACLEOD CONSTRUCTION / DENVER, N.C.

This company supplies construction materials, including ready-mix concrete, poured concrete walls, septic systems, stone, and concrete accessories. Its plants are located in both North and South Carolina. www.macinc1.com

72 GRAND JUNCTION CONCRETE PIPE / GRAND JUNCTION, COLO.

Manufacturer and distributor of concrete pipe, sand, and gravel serves western Colorado, eastern Utah, and northwestern New Mexico. It operates as a subsidiary of Summit Materials. www.gjpipe.com

73 FERRARA BROS. BUILDING MATERIALS / FLUSHING, N.Y.

New York-based, family-owned producer supplies ready-mix concrete and aggregates. In 2010, its projects included the World Trade Center Memorial and Second Avenue Subway in Manhattan.

74 INDEPENDENT CONCRETE PIPE / INDIANAPOLIS

Manufacturer of reinforced concrete pipe for storm and sanitary sewers across the U.S. has facilities in Ohio, Kentucky, Indiana, Missouri, and Illinois. Currently working on $600 million Louisville Airport project in Kentucky. www.icpipe.com

75 OZINGA BROTHERS, INC. / CHICAGO

Producer and supplier of ready-mix and decorative concrete, and exposed aggregates and overlay materials to metro Chicago, Indiana, and Michigan. Affiliates include Entrée Kitchen catering service. www.ozinga.com