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Calcite formation on steamed concrete surfaces and its potential for sealing cracks

Zemann, M.; Herrmann, N.; Dehn, F.

Abstract (englisch):
Under accidental conditions, concrete containments of nuclear power plants often remain as final barrier to the environment. To evaluate the contribution of self-healing processes of cracked concrete containments, small scale experiments were conducted for given accident scenarios to examine the mineralogical processes on cement crack surfaces in contact with hot steam-air mixes. The surface analyses with ESEM, µ-RFA and microscope showed a calcite formation, where layer thicknesses increased along the exposure times until reaching a stable level. The potential for crack healing was principally demonstrated through flow measurements, where the outflowing mass decreased during the experiments along with increasing calcite formation.

DOI: 10.1016/j.conbuildmat.2019.01.091
Zugehörige Institution(en) am KIT Institut für Massivbau und Baustofftechnologie (IMB)
Materialprüfungs- und Forschungsanstalt Karlsruhe (MPA)
Publikationstyp Zeitschriftenaufsatz
Jahr 2019
Sprache Englisch
Identifikator ISSN: 0950-0618
KITopen-ID: 1000090349
Erschienen in Construction and building materials
Band 203
Seiten 1–8
Nachgewiesen in Scopus
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