9 MDU RESOURCES / BISMARCK, N.D.
The Montana-Dakota Utilities Co. (MDU) recently completed a wind generation facility in North Dakota. Such projects reflect the company's commitment to a sustainable environment and environmental responsibility. www.mdu.com
10 MARTIN MARIETTA MATERIALS / RALEIGH, N.C.
Produces ready-mixed concrete in Arkansas and Texas. It is the second largest producer of crushed stone, sand, and gravel in the U.S. www.martinmarietta.com
11 BUZZI UNICEM / BETHLEHEM, PA.
Created by the 2004 merger of RC Cement and Lone Star Industries; serves the Midwest, Southwest, Northeast, and Southeast areas of the U.S. Recently built the River 7000 plant in St. Louis, which has the company's largest production line. www.buzziunicemusa.com
12 MITSUBISHI MATERIALS / CORONA, CALIF.
Company produces and sells construction materials in the U.S., China, Vietnam, and other countries. Other branches include automotive, electronics, and precious metals..mmc.co.jp/english/
13 TAIHEIYO CEMENT / GLENDORA, CALIF.
Manufactures and sells ready-mix throughout the West Coast region. In 2009, Taiheiyo acquired Nihon Ceratec, manufacturer of ceramic machinery components and electronics parts. www.taiheiyo-cement.co.jp/english$501 MILLION TO $1 BILLION
14 TXI / DALLAS
Major cement producer manufactures concrete in much of Texas and central Louisiana. TXI employees helped build a home featured on Extreme Makeover: Home Edition in October 2009. www.txi.com
15 CEMENTOS ARGOS / MEDELLIN, COLUMBIA
The U.S. makes up 34% of this producer's business. Its greatest concrete production capacity is in the U.S., where it can produce 11.6 million yards per year. www.argos.com.co
16 GRUPO CEMENTOS DE CHIHUAHUA / CHIHUAHUA, MEXICO
Reported a double-digit decline in concrete, block, and aggregate sales in 2009. Renegotiated its debt in May 2010 and reported growth in U.S. concrete and cement sales in this year's second quarter. www.gcc.com
17 CLYDE COMPANIES / OREM, UTAH
Awarded a contract for a $2.7 million overpass construction project in Twin Falls, Idaho. This year reorganized into two divisions: heavy/highway and special projects. www.clydeinc.com
18 U.S. CONCRETE INC. / HOUSTON
Filed for Chapter 11 bankruptcy protection in April 2010, and reports plans to emerge from bankruptcy by the end of August 2010. www.us-concrete.com