Faculty of Science and Applied Technology - University Guglielmo Marconi, Rome, Italy.
ACLabs- Applied Chemistry Labs, Department of Chemical, Materials and Industrial Production Engineering, University of Naples Federico II, Naples, Italy; Institute of Polymers, Composite and Biomaterials, National Research Council, Naples, Italy.
J Environ Manage. 2017 Apr 15;191:1-7. doi: 10.1016/j.jenvman.2017.01.001. Epub 2017 Jan 9.
Dredging activity in harbours and channels produces huge quantities of sediments, generally considered as waste soil (WS) to be disposed: the management of such sediments is a great environmental problem for many countries worldwide. Among the recycling possibilities, the use of dredged sediments for the manufacture of geopolymer-based materials seems to be an interesting alternative to disposal, due to their low cost and easy availability. In order to analyse the possibility to use these geopolymer materials as building materials - for instance as precast construction elements in maritime projects - a multi-disciplinary research activity has been developed at the Federico II University of Napoli (Italy). Some experimental tests have been carried out on different geopolymeric specimens made by mixing sediments from Napoli 'harbour and industrial fly ashes produced by a power plant in the South of Italy. A siliceous sand was used for comparison as an inert reference material. Chemical, morphological and mechanical properties of different specimens have been studied by X-ray diffraction, Scanning Electron Microscopy (SEM), Fourier transformed infrared spectroscopy (FTIR) and finally unconfined compression tests. The experimental results highlight that the use of dredged sediments in combination with fly ash can lead to geopolymeric matrices with interesting mechanical performances. Some differences in the microstructure of the geocomposite built with the siliceous sand or the dredged materials were found. In terms of environmental impacts, on the basis of standard leaching tests and according to Italian thresholds, the adopted dredged mixtures satisfy the prescribed limit for inert or non hazardous waste.
疏浚活动在港口和航道中产生了大量的沉积物，通常被认为是要处理的废土（WS）：这些沉积物的管理是世界上许多国家的一个重大环境问题。在回收利用的可能性中，由于其低成本和易得性，将疏浚沉积物用于制造基于地质聚合物的材料似乎是一种很有前途的处理替代方案。为了分析这些地质聚合物材料作为建筑材料的可能性 - 例如在海洋项目中作为预制建筑构件 - 那不勒斯费德里克二世大学（意大利）开展了一项多学科研究活动。已经对由那不勒斯港口沉积物和意大利南部一家发电厂产生的工业粉煤灰混合而成的不同地质聚合物标本进行了一些实验测试。为了进行比较，使用了硅质砂作为惰性参考材料。不同标本的化学、形态和机械性能通过 X 射线衍射、扫描电子显微镜（SEM）、傅里叶变换红外光谱（FTIR）和最终的无侧限抗压强度测试进行了研究。实验结果表明，将疏浚沉积物与粉煤灰结合使用可以得到具有有趣机械性能的地质聚合物基质。在采用硅质砂或疏浚材料制成的地质复合材料的微观结构方面发现了一些差异。就环境影响而言，根据标准浸出试验并根据意大利的门槛值，采用的疏浚混合物满足规定的惰性或非危险废物限值。
