The microstructure of carbonated concrete after exposed to different
CO2 concentrations were examined using JSM 5910LV
Scanning Electron Microscope (SEM) with an acceleration voltage
of 15–20 keV and working distance of 5–9 mm. Small strips
(25 mm 25 mm) were first cut out from the surface of carbonated
concrete cubes using a diamond saw. Then the samples were
cut into thin sections using a thin-bladed low-rpm precision circular
saw. To obtain a high quality smooth surface, a rotary disc
equipped with silicon carbide papers (#1200 and #2000) was used
to polish the samples. The samples were then immersed in acetone
to stop further hydration in the surface zone and cleaned using an
ultrasonic vibrator. Finally, the specimens were vacuum dried and
coated with a thin layer of gold. Each sample was photographed at
a magnification of 1000, 5000, 10,000 and 20,000 times
accordingly.
equation.
The microstructure of carbonated concrete after exposed to differentCO2 concentrations were examined using JSM 5910LVScanning Electron Microscope (SEM) with an acceleration voltageof 15–20 keV and working distance of 5–9 mm. Small strips(25 mm 25 mm) were first cut out from the surface of carbonatedconcrete cubes using a diamond saw. Then the samples werecut into thin sections using a thin-bladed low-rpm precision circularsaw. To obtain a high quality smooth surface, a rotary discequipped with silicon carbide papers (#1200 and #2000) was usedto polish the samples. The samples were then immersed in acetoneto stop further hydration in the surface zone and cleaned using anultrasonic vibrator. Finally, the specimens were vacuum dried andcoated with a thin layer of gold. Each sample was photographed ata magnification of 1000, 5000, 10,000 and 20,000 timesaccordingly.equation.
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