Martin Marietta Materials, Inc., together with its subsidiaries, supplies aggregates products and heavy building materials for the construction industry in the United States and internationally. It operates through Mid-America Group, Southeast Group, West Group, Cement, and Magnesia Specialties segments. The company mines, processes, and sells granite, limestone, sand, gravel, and other aggregate products for use in the public infrastructure, and nonresidential and residential construction industries, as well as in the agriculture, railroad ballast, chemical, and other applications. It also offers asphalt products, ready mixed concrete, and road paving construction services; and produces Portland and specialty cements for use in infrastructure projects, and nonresidential and residential construction, as well as in the railroad, agricultural, utility, and environmental industries. In addition, the company manufactures and markets magnesia-based chemical products for the industrial, agricultural, and environmental applications; and dolomitic lime primarily for use in the steel industry. Its chemical products are used in flame retardants, wastewater treatment, pulp and paper production, and other environmental applications.