@Article{jrm.2022.023214,
AUTHOR = {Dianen Liang, Zhenhao Ding, Qilin Yan, Redžo Hasanagić, Leila Fathi, Zi Yang, Longhao Li, Jianbo Wang, Houhua Luo, Qian Wang, Demiao Chu},
TITLE = {A Primary Study on Mechanical Properties of Heat-Treated Wood via <i>in-situ</i> Synthesis of Calcium Carbonate},
JOURNAL = {Journal of Renewable Materials},
VOLUME = {11},
YEAR = {2023},
NUMBER = {1},
PAGES = {435--451},
URL = {http://www.techscience.com/jrm/v11n1/49233},
ISSN = {2164-6341},
ABSTRACT = {This study aims to improve the value of fast-growing wood and extend the heat-treated wood utilization using
inorganic calcium carbonate (CaCO<sub>3</sub>) crystals via an in-situ synthesis method. CaCl<sub>2</sub> and Na<sub>2</sub>CO<sub>3</sub> solutions with
a concentration ratio of 1:1 were successively introduced into the thermally modified poplar wood obtained by
steam heat treatment (HT) at 200°C for 1.5 and 3 h, resulting in the in-situ synthesis of CaCO<sub>3</sub> crystals inside
the heat-treated wood. The filling effect was best at the concentration of 1.2 mol/L. CaCO<sub>3</sub> was uniformly distributed in the cell cavities of the heat-treated wood, and some of the crystals were embedded in the fissures of the
wood cell walls. The morphology of CaCO<sub>3</sub> crystals was mainly spherical and rhombic polyhedral. Three main
types of CaCO<sub>3</sub> crystals were calcite, vaterite, and aragonite. The HT of poplar wood at 200°C resulted in degrading the chemical components of the wood cell wall. This degradation led to reduced wood mechanical properties,
including the surface hardness (HD), modulus of rupture (MOR), and modulus of elasticity (MOE). After CaCO<sub>3</sub>
was in-situ synthesized in the heat-treated wood, the HD increased by 18.36% and 16.35%, and MOR increased by
14.64% and 8.89%, respectively. Because of the CaCO<sub>3</sub> synthesization, the char residue of the 200°C heat-treated
wood samples increased by 9.31% and the maximum weight loss rate decreased by 19.80%, indicating that the
filling with CaCO<sub>3</sub> cannot only improve the mechanical properties of the heat-treated wood but also effectively
enhance its thermal stability.},
DOI = {10.32604/jrm.2022.023214}
}