With the increasing prominence of global environmental issues and the growing demand for sustainable development, biomass composites have attracted widespread attention as candidates for environmentally friendly and renewable construction materials. In this study, environmentally friendly biomass-ash composites (BACs) were fabricated using hydrothermally activated incinerated sewage sludge ash (HT-ISSA) as filler and straw powder with waste sawdust as the biomass matrix for hot pressing. An investigation was conducted into the effect of HT-ISSA on the physical properties of the composite, including the bending strength, compressive strength, and thermal conductivity. The composite prepared with 15 wt% HT-ISSA demonstrated an exceptionally high bending strength (30.60 MPa), compressive strength (44.76 MPa), and low thermal conductivity (0.2380 W/m·K). The enhanced physical properties of the BAC material are attributable to the change caused by hydrothermal treatment of the filler phase. Due to the introduction of hydrated calcium silicate, the cohesion performance of the filler significantly improved, thus leading to strong adhesion and penetration within the matrix. The obtained BAC is applicable for packaging and insulation materials, thus providing an effective solution for the economical and environmentally friendly recycling of incinerated sewage sludge ash and other bulk solid waste. Additionally, it contributes novel insights into alleviating the current shortage of forest resources.

中文翻译：

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水热处理后污泥焚烧飞灰生物质-灰复合材料的制备及表征

随着全球环境问题的日益突出和可持续发展需求的不断增长，生物质复合材料作为环保可再生建筑材料的候选材料受到广泛关注。本研究以水热活化焚烧污水污泥灰（HT-ISSA）为填料，以废木屑秸秆粉为生物质基体进行热压，制备了环保型生物质-灰复合材料（BAC）。研究了 HT-ISSA 对复合材料物理性能的影响，包括弯曲强度、压缩强度和导热率。用15 wt% HT-ISSA制备的复合材料表现出极高的弯曲强度（30.60 MPa）、压缩强度（44.76 MPa）和低导热率（0.2380 W/m·K）。BAC材料物理性能的增强归因于填料相的水热处理引起的变化。由于水合硅酸钙的引入，填料的粘结性能显着提高，从而导致在基体中具有很强的附着力和渗透力。所得BAC适用于包装和保温材料，为焚烧污泥灰渣等大宗固体废物的经济环保回收利用提供了有效的解决方案。此外，它还为缓解当前森林资源短缺问题提供了新颖的见解。