The Effect of Mixing Ratios on Physical, Mechanical, and Thermal Properties in Lightweight Composite with Magnesium Oxychloride Cement

• Published in: International journal of thermophysics Vol. 44; no. 1
• Main Authors: Davraz, M., Koru, M., Akdağ, A. E.
• Format: Journal Article
• Language: English
• Published: New York Springer US 2023; Springer Nature B.V
• Subjects: Abrasion resistance; Blowing agents; Bulk density; Classical Mechanics; Compressive strength; Condensed Matter Physics; Coverings; Fire resistance; Floor coverings; Geophysics; Heat conductivity; Heat transfer; Hydrogen peroxide; Industrial Chemistry/Chemical Engineering; Lightweight; Magnesium chloride; Mechanical properties; Mixing ratio; Physical Chemistry; Physics; Physics and Astronomy; Potassium; Potassium iodides; Raw materials; Reagents; Relative humidity; Thermal conductivity; Thermal insulation; Thermodynamic properties; Thermodynamics; Thickening agents; Wallcoverings; Apparent dry density; Thermal conductivity; Magnesium oxychloride cement; Compressive strength; Ultra-lightweight composite; Mixture ratios
• ISSN: 0195-928X; 1572-9567
• DOI: 10.1007/s10765-022-03116-8

In the construction sector, the search for sustainable, environmentally friendly, and economical materials continues to find alternatives to conventional thermal insulation materials. Magnesium oxychloride cement (MOC) is widely used in panels, industrial floor coverings, and exterior wall coverings because of some of its properties some of its advantages high strength, fire resistance, and abrasion resistance. In this study, it is aimed to produce an ultra-lightweight composite (L·MOC) with the apparent density of ≤ 150 kg·m
−3
, compressive strength of ≥ 150 kPa, and thermal conductivity of ≤ 0.05 W·(mK)
−1
by using of MOC. For the L·MOC samples obtained within the scope of the study, the effects of mixing ratios on the physical, thermal, and mechanical properties of the material were investigated in detail. The basic raw materials used in the study were MgO, MgCl
2
·6H
2
O, and water. In addition, hydrogen peroxide was used as a blowing agent, potassium iodide as a catalyst, and carboxy methylcellulose as a thickener. The demolded samples were cured for 28 days under 23 °C and 50 % relative humidity conditions. The apparent density, compressive strength, and thermal conductivity tests of the hardened specimens were performed, and hydration products and microstructure analyses were performed. Afterward, the experimental results were evaluated to investigate the effects of mixing ratios on the physical, mechanical, and thermal properties the composite samples. Thus, the optimum ratios of hydrogen peroxide, cellulose, potassium iodide, and water were determined. As a result, the production of LMOC composite with an apparent density of 101 kg·m
−3
, compressive strength of ~ 200 kPa, and thermal conductivity of 0.048 W·(mK)
−1
was achieved.
Graphical Abstract