About Us

Mission Statement

To set the standards for performance & safety in the construction supply business by:


Corporate Values


Company Background & History

When R.S. Sweetman purchased C.A. Wagner Construction Co. in 1952, the company specialized in heavy/highway construction. Later, Sweetman Construction Co. diversified into other phases of road building and heavy construction projects in South Dakota and surrounding states.

Founded in 1930, Concrete Materials produced crushed rock from a small processing plant in west Sioux Falls. The company later added a small sand production plant near Rowene and, after World War II, opened Sioux Falls' first ready mix concrete plant adjacent to the original rock quarry. Sweetman Construction Co. purchased Concrete Materials in 1952.

Since its inception in the 1950s, the company has continued growing and expanding. Concrete Materials owns and operates aggregate and concrete production facilities in Chancellor, Yankton, and Sioux Falls, where we also have a stone quarry, sand and gravel processing plants, ready mix concrete plants, and asphalt plants. In 1992, Concrete Materials purchased Brandon Materials Co., operating a ready mix concrete plant and a sand and gravel processing plant in nearby Brandon, SD. Ellis & Eastern Railroad Co., founded in 1987, also operates in the Sioux Falls market area. In 2005, Concrete Materials expanded into the masonry block production business with the acquisition of the Gage Brothers block plant in Harrisburg, SD, and another plant in Rock Valley, IA, in the early 2000s, as well as adding various landscape block lines to their product list.  In 2012, Rail to Road was started, placing Sweetman Construction Co. in the business of Transloading. Transloading is the term used for the handling of goods shipped via rail to and from customers not located on a rail line.

Concrete Materials is committed to producing only the very best quality materials to serve the construction industry in eastern South Dakota and surrounding states.



G.P. Sweetman, Chairman of the Board


Patrick Sweetman, Chief Executive Officer


  • Title: Chief Executive Officer
  • Years of experience: 14
  • Education: Bachelor of Science Degree in Finance from Santa Clara University (1995)
  • Special Certificates/Awards/Activities: ACI Certified, National Ready Mix Concrete Association (NRMCA) Production Control Technician, and NRMCA Concrete Technologist


Kevin Moore, CPA, Chief Financial Officer

  • Title: Treasurer & Chief Financial Officer
  • Years of experience: 23
  • Education: Bachelor of Science Degree in Accounting from the University of South Dakota (1985)
  • Special Certificates/Awards/Activities: Certified Public Accountant, Member of American Institute of CPA's, Member of South Dakota CPA Society, Member of Construction Financial Management Association (CFMA), Member and Secretary of Siouxland Chapter of CFMA, Leadership Sioux Falls Graduate and Member, Secretary and Past President of Sioux Falls Midtown Sertoma


Billy Pollema, Aggregate Division Manager 

  • Title: Aggregate Division Manager


Stu Horsted, Ready Mix Division Manager


  • B.S. in Civil Engineering from South Dakota State University (1993)
  • American Concrete Institute (ACI) Concrete Field Testing Technician
  • ACI Concrete Flatwork Technician
  • National Ready Mix Concrete Association (NRMCA) Concrete Technologist
  • NRMCA Board Member, 2013-
  • SD Associated General Contractor Heavy Highway Utilities (SDAGC-HHU) Associate Board Member, 2008-2011

Clark Meyer, Transportation Division Manager, Rail to Road President, Ellis & Eastern Railroad President

  • Title: Transportation & Rail to Road President
  • Years of experience: 18
  • Education: Bachelor of Science in Computer Science, Associates Degree in Mathematics and Business
  • Special Certificates/Awards/Activities: Leadership of Sioux Falls-18 (2004), Bituminous Technician (Level II), American Concrete Institute (Level 3)

Bob Matzke, Block Division Manager

   •Title: Block Division Manager





Community Involvement

Concrete Materials proudly supports these & other non-profit organizations:


Member Affiliations