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Saltcrete is a mixture of cement with salts and brine, usually originating from liquid waste treatment plants. Its role is to immobilize hazardous waste and in some cases lower-level radioactive waste in the form of solid material. It is a form of mixed waste. Saltcrete is being replaced by saltstone, which is less permeable and leachable. Saltstone is a mixture of the salt cake (mostly sodium nitrate and other salts) with concrete and fly ash. The example of saltcrete sites in the United States is The Rocky Flats Environmental Technology Site or RFETS located approximately 15 miles northwest of Denver, Colorado. A historical mission was the manufacture of nuclear weapons components by using various radioactive and hazardous materials, including plutonium, uranium and beryllium, this place was chosen for the certain reason by the Atomic Energy Commission or the AEC. Around 4 decades for the production operation, between 1952 to 1992, the site was listed on National Priorities List for cleanup by the Environmental Protection Agency or EPA. After the cold war's end in 1991, the RFETS mission was cleanup and closure in 1994 and activated again in 2003. == Saltcrete-related background of RFETS == In June, 1997 Kaiser-Hill Company, L.L.C., also known as CH2M HILL, the DOE Integrating Management Contractor for RFETS, contracted with Envirocare of Utah, Inc., also known as EnergySolutions, to transport, treat and dispose of more than 13,000 cubic meters of radioactively and hazardously contaminated mixed waste, including the Saltcrete waste stream. Shipment of Saltcrete began in July, 1997. -The first phase of 1,705 cubic meters of the Saltcrete waste stream was successfully transported, treated and disposed in less than 8 weeks. -The second phase of 1,710 cubic meters was completed in the first quarter of FY98 in the same amount of time. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Saltcrete」の詳細全文を読む スポンサード リンク
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