Effect of Curing Conditions and CO2 Incubation on Properties of a Novel Wood-Lime Biocomposite
2022
Pargar, Farhad | Zanotti, Cristina
Wood waste from construction sites represents an environmental and financial burden. Furthermore, there is a need in everyday practice to replace CO₂-intensive construction materials and especially Portland cement, with less polluting alternatives such as slag, metakaolin, hydraulic and non-hydraulic lime, or magnesium cement, among many others. In this scenario, an eco-friendly insulator made of recycled wood chips embedded in a lime-metakaolin binder was proposed and assessed for application in the construction industry. The influence of curing regimes on carbonation, microstructure, compressive and flexural strength, density, and thermal conductivity was studied. Specimens were cured in three subsequent environments of variable duration: (i) under a plastic sheet with high moisture content, (ii) exposed to drying in standard lab conditions and, (iii) in a CO₂ incubator. Pre-conditioning of the specimens before the CO₂ curing, affected the carbonation efficiency and subsequently microstructure and mechanical properties of the biocomposite. Carbonation rate (from different curing regimes) affected mechanical properties also when comparing fully carbonated specimens, leading to different engineering properties of the biocomposite. Density and thermal conductivity were less impacted overall.
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