Department of Civil Engineering, Indian Institute of Technology Delhi, New Delhi-110016, India.
Waste Manag. 2023 Aug 1;168:344-353. doi: 10.1016/j.wasman.2023.06.024. Epub 2023 Jun 19.
The study presents the geoenvironmental and geotechnical characterization of MSW incineration bottom ash (IBA) and examines its reuse as structural fill in reinforced soil structures (RSS).The suitability of reuse has been assessed with regard to international regulatory standards. The prime focus of the work remains on evaluating the pullout response of geosynthetic reinforcements through IBA fill to determine the interaction coefficient, which has never been addressed in the literature. The economic viability of using IBA instead of locally available river sand for a 12 m high MSE wall is also established. The column leaching test results confirm that IBA can be utilized in RSS with suitable design measures. The geotechnical investigation shows that IBA is a well-graded, non-plastic lightweight material with adequate drainage and high shear strength. The pullout test results demonstrate that the interaction coefficient of polymeric strips and geogrid in IBA (0.73-1.53 and 0.79-1.91, respectively) is comparable or higher to materials conventionally used as structural fill in RSS, indicating adequate bondage between IBA and geosynthetic reinforcement. Further, it is estimated that using IBA as a substitute for available river sand in the vicinity can potentially reduce the overall RSS project cost by 15-20%, even if IBA has to be transported 50 km away from the project site.
本研究对垃圾焚烧底灰（IBA）进行了地质环境和岩土工程特性描述，并考察了其作为加筋土结构（RSS）中结构性填土的再利用潜力。本研究参照国际监管标准，评估了 IBA 再利用的适宜性。工作的主要重点仍然是通过 IBA 填充评估土工合成材料加筋的拔出响应，以确定交互作用系数，这在文献中从未涉及过。还确定了使用 IBA 代替当地可获得的河砂作为 12 米高的 MSE 墙的经济可行性。柱浸出试验结果证实，IBA 可以在 RSS 中使用合适的设计措施。岩土工程调查表明，IBA 是一种级配良好、无塑性、重量轻的材料，具有良好的排水性和高抗剪强度。拔出试验结果表明，聚合物条带和土工格栅在 IBA 中的相互作用系数（分别为 0.73-1.53 和 0.79-1.91）与 RSS 中通常用作结构性填土的材料相当或更高，表明 IBA 与土工合成材料加筋之间具有足够的粘结力。此外，估计如果必须从项目现场运输 50 公里以外的 IBA，那么使用 IBA 替代附近现有的河砂可能会使整个 RSS 项目成本降低 15-20%。
