MOC-Diatomite Composites Filled with Multi-Walled Carbon Nanotubes

Area of Science:

• Materials Science
• Civil Engineering
• Nanotechnology

Background:

• Magnesium oxychloride cement (MOC) composites are gaining attention for their mechanical properties and sustainability.
• Previous attempts to enhance MOC performance faced challenges like aggregation and reduced water resistance.

Purpose of the Study:

• To design and test MOC-based composites doped with multi-walled carbon nanotubes (MWCNTs) and diatomite.
• To investigate the impact of MWCNTs and diatomite on MOC's macrostructural, microstructural, mechanical, hygric, and thermal properties.

Main Methods:

• Composites were fabricated with partial MgO substitution by diatomite and MWCNT doping.
• Characterization involved SEM, EDS, HR-TEM, XRD, OM, and STA-MS.
• Mechanical, hygric, and thermal properties were assessed after 28 days of hardening.

Main Results:

• MWCNT and diatomite incorporation significantly improved composite compactness, mechanical strength, and stiffness.
• Water absorption and imbibition rates were substantially reduced.
• Enhanced thermal properties were observed, indicating potential for climate moderation.

Conclusions:

• The combination of MWCNTs and diatomite is a valuable modification for MOC matrices.
• These enhanced MOC composites show promise for developing advanced, sustainable building materials.