Lin Yanling, Ren Yuzhe, Ge Tiange, Al-Ajamee Mohammed, Xu Yinglei, Mohamed Abubaker Ahmed Mohamed Salih, Ma Lu, Huang Liliang
School of Construction Engineering, Jiangsu Open University, No.399 North Jiangdong Road, Nanjing, China.
Key Laboratory of Ministry of Education for Geomechanics and Embankment Engineering, Hohai University, No.1 Xikang Road, Nanjing, China.
Sci Rep. 2024 Nov 18;14(1):28500. doi: 10.1038/s41598-024-77133-y.
With the rapid expansion of construction engineering, the demand for traditional materials, particularly natural river sand, has surged, resulting in excessive resource exploitation and significant ecological damage. In response, the use of waste oyster shells as a sustainable alternative for fine aggregates has gained attention. However, limited research has been conducted on the dynamic properties of mortar with this substitution. This study explores the potential of using crushed oyster shell sand (OSS) as fine aggregates in mortar. A series of Split Hopkinson Pressure Bar (SHPB) tests under different gas pressures (p) (0.2, 0.3, and 0.4 MPa) were carried out on mortar samples with five OSS replacement ratios (R) (0%, 20%, 50%, 80%, and 100%), using a water-to-cement ratio of 0.55. The results showed that when the OSS replacement rate (R) increased from 0 to 20%, there was a significant increase in peak stress (σ) and elastic modulus (E), attributed to the filling effect of OSS, which enhanced the absorbed energy (E) and strength contribution rate (SCR). However, at R above 20%, a sharp decline in σ and E was observed, primarily due to porous characteristics of OSS. Correspondingly, E decreased, reducing the impact resistance of mortar. Moreover, the negative SCR suggests detrimental effects on mortar integrity at higher OSS R levels. Predictive relationships for peak stress and elastic modulus across different replacement ratios were established in this study, providing a foundational reference for the design and assessment of the dynamic mechanical response of structures incorporating OSS.
随着建筑工程的迅速扩张，对传统材料尤其是天然河砂的需求激增，导致资源过度开采和严重的生态破坏。作为应对措施，将废弃牡蛎壳用作细集料的可持续替代品受到了关注。然而，关于这种替代物对砂浆动态性能的研究有限。本研究探讨了使用碎牡蛎壳砂（OSS）作为砂浆细集料的潜力。使用水灰比为0.55，对五种OSS替代率（R）（0%、20%、50%、80%和100%）的砂浆样品在不同气压（p）（0.2、0.3和0.4MPa）下进行了一系列霍普金森压杆（SHPB）试验。结果表明，当OSS替代率（R）从0增加到20%时，峰值应力（σ）和弹性模量（E）显著增加，这归因于OSS的填充效应，增强了吸收能量（E）和强度贡献率（SCR）。然而，当R高于20%时，观察到σ和E急剧下降，主要是由于OSS的多孔特性。相应地，E降低，降低了砂浆的抗冲击性。此外，负的SCR表明在较高的OSS替代率水平下对砂浆完整性有不利影响。本研究建立了不同替代率下峰值应力和弹性模量的预测关系，为包含OSS的结构动态力学响应的设计和评估提供了基础参考。
