Evolution Characteristics of the Cracks in the Completely Disintegrated Carbonaceous Mudstone Subjected to Cyclic Wetting and Drying

Figure 3

Sketch of the new test instrument. 1: heat lamp for drying the sample; 2: fan for accelerating the air convection; 3: sample; 4: electronic scale for weighing the sample; 5: exhaust vent for discharging the water vapor during drying; 6: digital camera for taking high-definition images; 7: vacuum saturation cylinder for saturating the sample; 8: saturator for containing the sample; 9: piezometer for monitoring the pressure in the vacuum saturation cylinder; 10: bucket; 11: water pipe; 12: pump for providing vacuum power.