Concrete/mortar water phase transition studied by single-point MRI methods.
A series of magnetic resonance imaging (MRI) water density and T2* profiles in hardened concrete and mortar samples has been obtained during freezing conditions (-50 degrees C < T < 11 degrees C). The single-point ramped imaging with T1 enhancement (SPRITE) sequence is optimal for this study given the characteristic short relaxation times of water in this porous media (T2* < 200 microseconds and T1 < 3.6 ms). The frozen and evaporable water distribution was quantified through a position based study of the profile magnitude. Submillimetric resolution of proton-density and T2*-relaxation parameters as a function of temperature has been achieved.
Prado
P J
PJ
Department of Physics, University of New Brunswick, Fredericton, Canada.
Balcom
B J
BJ
Beyea
S D
SD
Armstrong
R L
RL
Bremner
T W
TW
Grattan-Bellew
P E
PE
D002484:Cementation; D003252:Construction Materials; D005615:Freezing; D006801:Humans; D008279:Magnetic Resonance Imaging; D016062:Porosity; D014867:Water
D014867:Water