Materials Performance is the world's most widely circulated magazine dedicated to corrosion prevention and control. MP provides information about the latest corrosion control technologies and practical applications for every industry and environment.
MATERIAL MATTERS Continued from page 17
Q\ ZMÆMK\[
ÅJMZ WX\QK[ \W \ZIV[UQ\ \PMQZ UMI[]ZM- UMV\ LI\I J]\ \PMa LW VW\ ][M .*/ technology to physically sense changes QV X0 WZ KPTWZQLM TM^MT[ VW\M[ ;]V 1V- stead, these sensors use a chemical re- sponse instead of a physical response to UMI[]ZM MV^QZWVUMV\IT KPIVOM[
environment changes the optical signal generated by the sensor, which is re- turned to the interrogator through the [IUM ÅJMZ .WZ \PM KWZZW[QWV [MV[WZ[ developed by the research team, the LMOZMM WN KPIVOM QV MQ\PMZ \PM ZMÆMK\ML wavelength or the signal generated by the sensor is an indicator of the degree of the environment's corrosiveness, [Ia[ ;]V
18 MATERIALS PERFORMANCE March 2012
\IV\ NIK\WZ[ \PI\ QVÆ]MVKM I\UW[XPMZQK KWZZW[QWV ]\QTQbM I ÅJMZ *ZIOO OZI\QVO .*/ I[ \PM [MV[QVO MTMUMV\
CO3 ) resulting from hydrated cement
compounds reacting with atmospheric carbon dioxide (CO2
), the ensuing car-
bonation leads to a reduction of the concrete's alkalinity—to a pH value as TW_ I[
¸IVL KI][M[ I OMVMZIT JZMIS-
down in passivity of the steel rebar that UISM[ Q\ [][KMX\QJTM \W KWZZW[QWV
NACE International, Vol. 51, No. 3