Table 2.

Sample properties and test methods.

Description	Test method
Appearance, mass and density	Survey, dimensions, weight and density measurement
Air pore content and distribution	X-ray computed tomography (CT), optical microscopy and mercury intrusion porosimetry (MIP)
Characteristics of the microstructure	Scanning electron microscopy (SEM) and micro x-ray computed tomography (µ-CT)
Mechanical properties (compressive strength, stiffness and E-modulus)	Ultrasound measurement and destructive pressure test