Characterization of Porous Cementitious Materials Using Microscopic Image Processing and X-ray CT Analysis

Area of Science:

• Materials Science
• Civil Engineering
• Concrete Technology

Background:

• Lightweight concrete use is rising due to reduced dead load in infrastructure.
• Pore characteristics significantly influence lightweight concrete properties like strength and insulation.
• Accurate pore characterization is vital for optimizing concrete performance.

Purpose of the Study:

• To comparatively analyze pore characteristics in cementitious materials.
• To evaluate three distinct testing methods for pore identification.
• To establish relationships between pore structure and material density.

Main Methods:

• Water absorption tests to determine water-permeable porosities.
• Microscopic image processing for 2D pore analysis (pore ratio, size, number).
• X-ray computed tomography (X-ray CT) for 3D pore analysis (volume ratio, size, distribution, open/closed pores).

Main Results:

• Water absorption, microscopic imaging, and X-ray CT provided complementary data on pore characteristics.
• Established relationships between oven-dried density and various porosity measurements.
• Detailed 2D and 3D pore parameters were quantified for 12 cementitious materials.

Conclusions:

• The combined application of water absorption, microscopic imaging, and X-ray CT offers a comprehensive approach to pore characterization in cementitious materials.
• Understanding pore structure is key to enhancing lightweight concrete performance.
• This comparative study validates the utility of multiple techniques for robust material analysis.