Department of Metallurgical and Materials Engineering, Federal University of Technology, Akure, Ondo State, Nigeria.
Department of Metallurgical and Materials Engineering, Kogi State Polytechnic, Osara, Kogi State, Nigeria.
Environ Sci Pollut Res Int. 2023 Jan;30(5):11823-11837. doi: 10.1007/s11356-022-22955-4. Epub 2022 Sep 13.
The development of agricultural waste-doped fired bricks is an important step toward achieving lightweight eco-efficient bricks with improved thermal insulation property. Recent research in masonry has been tailored towards the production of energy-efficient building by incorporating waste materials as additives. This effectuates a safe waste disposal, cost effectiveness, and also serve as a giant stride towards environmental sustainability. This study examines the viability of using walnut shell as additive in fired clay at various firing temperatures. Pulverized walnut shell was added to clay at a proportion of 0-10 wt.% by weight of clay. The samples were fired at temperatures of 950 °C and 1100 °C. The samples were probed for mechanical properties and durability. Morphology of the brick samples were examined under scanning electron microscope. The result of the research showed increased water absorption and specific heat capacity while mechanical and bulk density were observed to reduce. Linear shrinkage and thermal conductivity reduced with increase in walnut content of which linear shrinkage and thermal conductivity values experienced at 1100 °C was higher than at 950 °C. Resistance of bricks to salt crystallization increased with firing temperature. All samples met various standard requirement for masonry except sample prepared with 10 wt.% walnut shell whose compressive and flexural strengths fell below the required standard. The study established the use of walnut shell for development of sustainable energy-efficient bricks.
农业废弃物烧制砖的发展是实现轻质生态高效砖并改善其保温性能的重要步骤。最近的砌体研究针对通过将废物材料作为添加剂来生产节能建筑进行了调整。这实现了安全的废物处理、成本效益，并且也是迈向环境可持续性的重要一步。本研究探讨了将核桃壳作为不同烧制温度下烧制粘土的添加剂的可行性。将粉碎的核桃壳按粘土重量的 0-10wt.%的比例添加到粘土中。将样品在 950°C 和 1100°C 的温度下烧制。对样品的机械性能和耐久性进行了探测。通过扫描电子显微镜检查砖样品的形态。研究结果表明，吸水率和比热容增加，而机械强度和体积密度降低。线性收缩和热导率随核桃含量的增加而降低，其中在 1100°C 下的线性收缩和热导率值高于在 950°C 下的值。砖的抗盐结晶能力随烧制温度的升高而提高。除了抗压强度和抗弯强度低于要求标准的 10wt.%核桃壳样品外，所有样品均符合砌体的各种标准要求。该研究确立了使用核桃壳来开发可持续的节能砖。
