Microanalytical characterizations, mechanical strength and water resistance performance of solidified dredged sludge with industrial solid waste and architecture residue soil

• DOI: 10.1016/j.cscm.2022.e01492
• Publication Date: 2022-09-19T05:44:08Z
• Authors: Ye Liu; Haijun Lu; Mengyi Liu; Lei Cai; Na Wei; Yajun Liu
• Keywords: Ettringite; Silt; Industrial waste

Industrial solid waste (slag, desulphurization gypsum, fly ash) and construction soil architecture residue are used to solidify dredged silt develop a novel cover material. Through the application of shear, compressive, permeability tests, shear strength parameters, unconfined compressive strength, volume shrinkage hydraulic conductivity cured were assessed under different curing times wet-dry cycles conditions. The result shown slag played most significant role in consolidation process, followed by FGD gypsum ash. X-ray diffraction (XRD), Fourier-transform infrared spectroscopy (FT-IR), scanning electron microscopy with energy dispersive (SEM-EDS) nuclear magnetic resonance (NMR) detection methods employed determine hydration products, chemical characteristics, microscopic morphology pore structure solidified sludge, identify solidification mechanisms industrial slag. After wet dry cycles, micropores foramen (0.1–0.5 µm) continued dominate pores, accounting for 64–76 % space. Hydration products sludge primarily consisted C-S-H, C-A-S-H, N-A-S-H gelled along ettringite zeolite.