Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
New method to measure the rapid chloride migration coefficient of chloride-contaminated concrete
AbstractThe apparent chloride diffusion coefficient, Dapp, which is obtained by fitting chloride profiles as the result of time-consuming immersion tests can be substituted in a model on chloride ingress by the rapid chloride migration (RCM) coefficient of concrete, DRCM, which is determined under electrically accelerated conditions. Until now, it was not possible to measure DRCM of chloride-contaminated concrete, as already inherent chlorides interfere with the common colorimetric indicator used for penetration depth measurements. Furthermore, carbonation may also interfere with the penetration depth reading. To overcome these problems, the regular test has been modified by using iodide as penetrating ion and iodate–starch acetic acid as indicator. A strong linear relationship between the regular RCM test and the newly developed Rapid Iodide Migration (RIM) Test was found. Carbonated specimens can be tested using the RIM test without additional interference. Thus, the new method enables the quantification of the actual concrete quality sampled from existing structures during a condition assessment.
New method to measure the rapid chloride migration coefficient of chloride-contaminated concrete
AbstractThe apparent chloride diffusion coefficient, Dapp, which is obtained by fitting chloride profiles as the result of time-consuming immersion tests can be substituted in a model on chloride ingress by the rapid chloride migration (RCM) coefficient of concrete, DRCM, which is determined under electrically accelerated conditions. Until now, it was not possible to measure DRCM of chloride-contaminated concrete, as already inherent chlorides interfere with the common colorimetric indicator used for penetration depth measurements. Furthermore, carbonation may also interfere with the penetration depth reading. To overcome these problems, the regular test has been modified by using iodide as penetrating ion and iodate–starch acetic acid as indicator. A strong linear relationship between the regular RCM test and the newly developed Rapid Iodide Migration (RIM) Test was found. Carbonated specimens can be tested using the RIM test without additional interference. Thus, the new method enables the quantification of the actual concrete quality sampled from existing structures during a condition assessment.
New method to measure the rapid chloride migration coefficient of chloride-contaminated concrete
Lay, S. (Autor:in) / Liebl, S. (Autor:in) / Hilbig, H. (Autor:in) / Schießl, P. (Autor:in)
Cement and Concrete Research ; 34 ; 421-427
21.08.2003
7 pages
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
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