Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Deteriorated Concrete from Liner of WIPP Waste Shaft
Samples of a fly-ash concrete were studied after 6 years in service underground. The cores studied represented a construction joint and other areas of exposure to local groundwater. Observed evidence of deterioration, relative to companion cores of nondeteriorated concrete, included softening of the paste fraction, discoloration, an extensive network of microfractures cutting through both paste and aggregates, and crystalline deposits along fractures. In laboratory studies, we sought to determine the causes of these features, by studies of phase composition, chemical composition, and microstructure. X-ray diffraction analyses revealed magnesium chloride hydroxide hydrate, gypsum, and brucite in subsamples that should have been cement paste and along fractures. We attribute the condition of the concrete to chemical alteration by interaction with magnesium-bearing groundwater, which occurs naturally in the service environment.
Deteriorated Concrete from Liner of WIPP Waste Shaft
Samples of a fly-ash concrete were studied after 6 years in service underground. The cores studied represented a construction joint and other areas of exposure to local groundwater. Observed evidence of deterioration, relative to companion cores of nondeteriorated concrete, included softening of the paste fraction, discoloration, an extensive network of microfractures cutting through both paste and aggregates, and crystalline deposits along fractures. In laboratory studies, we sought to determine the causes of these features, by studies of phase composition, chemical composition, and microstructure. X-ray diffraction analyses revealed magnesium chloride hydroxide hydrate, gypsum, and brucite in subsamples that should have been cement paste and along fractures. We attribute the condition of the concrete to chemical alteration by interaction with magnesium-bearing groundwater, which occurs naturally in the service environment.
Deteriorated Concrete from Liner of WIPP Waste Shaft
L. D. Wakeley (Autor:in) / T. S. Poole (Autor:in) / J. P. Burkes (Autor:in)
1992
100 pages
Report
Keine Angabe
Englisch
Radiation Pollution & Control , Radioactive Wastes & Radioactivity , Ceramics, Refractories, & Glass , Hydrology & Limnology , Physical & Theoretical Chemistry , Concrete , Fly ash , Chemical attack(Degradation) , Waste disposal , Radioactive wastes , Brines , Cements , Chemical composition , Chemicals , Chlorides , Cores , Deposits , Deterioration , Discoloration , Gypsum , Hydrates , Hydroxides , Interactions , Isolation , Laboratories , Magnesium , Microstructure , Networks , Pastes , Softening , Underground , Wastes , X ray diffraction , Ground water , Microcracking , Fracture(Mechanics) , Aggregates(Materials) , Construction materials , Underground structures , Degradation , Brine , Waste isolation pilot , Portland cement , WIPP , Waste shaft liners , Concrete linings
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