Metallographic experiments for cement
Cement is also known as a net slurry hardener. It is a hardened cement paste, called cement, written cement in English, sometimes written caement, which is a non-nonhomogeneous body consisting of gelinite, a core of unhydrated cement particles, pores, etc.
01 mounting
Due to the porosity in the cement, use TJ2562 for vacuum mounting, the resin is mixed proportionally in the Theta Vacuum cold mounting machine and the specimen is placed in the ThetaMount pressure cold mounting machine and cured under pressure for about 12h.；
Equipment
Theta Vacuum cold mounting machine
ThetaMount pressure cold mounting machine
Consumables
TJ2562
Parameter
0.2MPa，12h
02 Grinding
Grind the sample with Alpha-600 automatic grinder&polisher，abrasive paper P800→P2500；
Equipment
Alpha-600 automatic grinder&polisher
Consumables
Abrasive paper：P800；P1200；P2000；P2500
Parameter
Pressure：20N，speed：130rpm，time：2min
（P2000&P2500 time：5min）
03 Polishing
Polish the specimen with Alpha-600 automatic grinder&polisher, polish it with SC polishing cloth and 2μm water-free based polycrystalline diamond suspension.
Equipment
Alpha-600 automatic grinder&polisher
Consumables
SC polishing cloth，2μm water-free based polycrystalline diamond suspension
Parameter
Pressure： 20N，Speed：150rpm，Time: 5~10min
04 Observation
Equipment
MN 60 Series metallographic microscope
Parameter
50×→500×
09 Analysis
Cement is porous, for this reason vacuum cold mounting and resin is applied to fill the pores. The fine grinding should be extended appropriately to remove the fractured layer produced during the rough grinding. Cement is sensitive to water, so it must be polished with a non-water-based polishing suspension when polishing.
