Non-destructive measurements of1H,23Na and35Cl profiles in cementitious materials with NMR

Onderzoeksoutput: Hoofdstuk in Boek/Rapport/CongresprocedureConferentiebijdrageAcademicpeer review

Samenvatting

It is widely acknowledged that chloride-induced corrosion is one of the main degradation mechanisms in civil structures based on reinforced concrete. Gaining insight into the transport phenomena can improve the assessment of durability aspects of existing structures. At the moment there is lack of experimental data on this topic that can be used to validate or discredit the wide range of models available in literature. While such models might be correct, erroneous input is bound to lead to false predictions (i.e., the garbage in, garbage out principle). Nowadays there is a wide range of non-destructive techniques available. While most of these methods are able to detect chloride content non-destructively, of them are able to measure moisture and ion transport simultaneously. For research a method that can measure combined moisture and ion profiles with high accuracy and high temporal and spatial resolution would be desired as to verify transport models. Using a specially designed Nuclear Magnetic Resonance (NMR) setup quasisimultaneously the1H,23Na and35Cl content can be measured in cementitious materials. As the gyromagnetic ratio of the selected nuclei is too far apart to be combined into one insert we have opted to use the main field of a 1.5T whole body MRI system (Philips Intera). The sensitivity of the current setup is sufficient to monitor the intrusion of seawater in cementitious materials. The relaxation of1H,23Na and35Cl can be used to obtain pore-size information, and thereby information on the pore-ion concentration distribution during transport. Moreover the setup has shown that by multi nuclei measurements more insight could be gained on interactions with the cement matrix. It is seen that the Na/Cl ratio changes during the hydration, indication a chemical/ physical interaction with cement matrix.

Originele taal-2Engels
TitelLife-Cycle of Engineering Systems
SubtitelEmphasis on Sustainable Civil Infrastructure - 5th International Symposium on Life-Cycle Engineering, IALCCE 2016, 16-19 October 2016, Delft, The Netherlands
Plaats van productieBoca Raton
UitgeverijCRC Press
Pagina's1013-1017
Aantal pagina's5
ISBN van geprinte versie9781138028470
StatusGepubliceerd - 2017
Evenement5th International Symposium on Life-Cycle Engineering (IALCCE 2016) - Delft, Nederland
Duur: 16 okt 201619 okt 2016
Congresnummer: 5
http://www.ialcce2016.org/

Congres

Congres5th International Symposium on Life-Cycle Engineering (IALCCE 2016)
Verkorte titelIALCCE 2016
Land/RegioNederland
StadDelft
Periode16/10/1619/10/16
Internet adres

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