Department of Architecture and Architectural Engineering, Yonsei University, Seoul 03722, Republic of Korea.
Department of Architecture and Architectural Engineering, Yonsei University, Seoul 03722, Republic of Korea.
Environ Res. 2021 Feb;193:110359. doi: 10.1016/j.envres.2020.110359. Epub 2020 Oct 28.
Wood is a sustainable resource and building material. It provides an excellent response to climate change and has excellent insulation performance. However, structural defects may occur due to decay from moisture, resulting in poor dimensional stability. The rich organic substances contained in wood can lead to mold when the moisture content is consistently high, adversely affecting the health of occupants. Therefore, we attempted to compensate for the disadvantages of wood in regard to water stability while maintaining the high thermal insulation performance and carbon dioxide storage capacity, using biochar from thermally decomposed spruce under oxygen limiting conditions. A wood-derived biocomposite was prepared by mixing biochar and soft wood-based chips using the hot-press method, and the thermal conductivity, specific heat, water vapor resistance factor, moisture adsorption, and moisture desorption performances were analyzed. The thermal conductivity of WB10 with 10 wt% biochar content was 0.09301 W/mK. This is a 7.98% decrease from 0.10108 W/mK, the thermal conductivity of WB0 without biochar. The water vapor resistance factor tended to increase when the biochar ratio increased. As the proportion of biochar increased, the equilibrium moisture content in high relative humidity tended to decrease, and it was found that the moisture adsorption and desorption performances were affected by the ratio of the biochar. Therefore, wood-derived biocomposites using biochar can be used in environmentally friendly materials, with improved thermal insulation performance and water stability.
木材是一种可持续的资源和建筑材料。它对气候变化有很好的响应，具有优异的隔热性能。然而，由于水分引起的腐烂，结构缺陷可能会发生，从而导致尺寸稳定性差。木材中含有的丰富有机物在水分含量持续较高时会导致霉菌滋生，对居住者的健康产生不利影响。因此，我们试图在保持高隔热性能和二氧化碳储存能力的同时，弥补木材在水稳定性方面的劣势，使用在缺氧条件下热解的云杉产生的生物炭。通过将生物炭和软木基刨花混合使用热压法制备了一种木材衍生的生物复合材料，并分析了其导热系数、比热容、水蒸气阻透系数、吸湿和解吸性能。含 10wt%生物炭的 WB10 的导热系数为 0.09301 W/mK，比不含生物炭的 WB0 的导热系数 0.10108 W/mK 降低了 7.98%。随着生物炭比例的增加，水蒸气阻透系数趋于增加。随着生物炭比例的增加，高相对湿度下的平衡水分含量趋于降低，并且发现吸湿和解吸性能受到生物炭比例的影响。因此，使用生物炭的木材衍生生物复合材料可以用于环保材料，提高其隔热性能和水稳定性。
