Hong Yao-Ming, Choudhury Sharan Roy
Department of Natural Resource and Environmental Studies, National Dong Hwa University, Hualien 97401, Taiwan.
Department of Green Technology for Sustainability, Nanhua University, Chiayi 62248, Taiwan.
Materials (Basel). 2024 Dec 16;17(24):6148. doi: 10.3390/ma17246148.
The construction industry contributes significantly to global carbon emissions, accounting for approximately 27% of total emissions. With the increasing demand for concrete, there is a growing need to explore alternative materials that can reduce environmental impact. This study investigates the potential of using oyster shell powder, a waste material, as a partial replacement for fine aggregates in concrete. The methodology involves replacing fine aggregates with oyster shell powder in varying proportions (0%, 10%, 20%, 30%, and 40%) and testing the compressive strength of the resulting concrete after 56 days. The concrete mix used in this study consists of 16.67% cement, 33.33% fine aggregates, and 50% coarse aggregates (10-20 mm). The findings show that increasing oyster shell content reduces the concrete's compressive strength; however, at 40% replacement, the concrete still achieves a compressive strength of 30 MPa, which meets the required building strength standards. Additionally, the use of oyster shell powder reduces the unit weight of concrete by approximately 10% at the 40% substitution rate, due to the lower specific gravity of oyster shells compared to sand. This research highlights the potential of using oyster shell powder as a viable solution for mitigating oyster shell waste while providing an alternative material for fine aggregates in concrete.
建筑业对全球碳排放贡献巨大，约占总排放量的27%。随着对混凝土需求的增加，越来越需要探索能减少环境影响的替代材料。本研究调查了将废弃材料牡蛎壳粉用作混凝土细集料部分替代品的潜力。该方法包括用不同比例（0%、10%、20%、30%和40%）的牡蛎壳粉替代细集料，并在56天后测试所得混凝土的抗压强度。本研究中使用的混凝土混合料由16.67%的水泥、33.33%的细集料和50%的粗集料（10 - 20毫米）组成。研究结果表明，增加牡蛎壳含量会降低混凝土的抗压强度；然而，在替代率为40%时，混凝土仍能达到30兆帕的抗压强度，符合所需的建筑强度标准。此外，由于牡蛎壳的比重低于沙子，在替代率为40%时，使用牡蛎壳粉可使混凝土的单位重量降低约10%。本研究突出了将牡蛎壳粉用作减轻牡蛎壳废料的可行解决方案的潜力，同时为混凝土中的细集料提供替代材料。
