Relationship between Phase Composition and Mechanical Properties of Peat Soils Stabilized Using Oil Shale Ash and Pozzolanic Additive

摘要: Construction of road embankments in peatlands commonly involves replacement the peat with a fill-up soil an adequate load-bearing capacity. This usually requires lowering water level, turning peatland from carbon sink to source greenhouse gases. Thus, alternatives are sought that less costly both economic and ecological terms. Mass-stabilization technology can provide cheap substitute for Portland cement. Calcareous ashes (waste materials), supplemented pozzolanic alkali additives facilitate accelerate setting hardening processes, attractive excavation or techniques. Silica fume waterglass were used as agents KOH soil-alkalizing agent. X-ray fluorescence (XRF), Fourier-transform infrared spectroscopy (FTIR), diffraction (XRD) analyses stress–strain tests performed hardened samples. Crystallization feldspars was observed all test Comparable achieved ashes. It shown Estonian kukersite (oil shale) pulverized firing circulating fluidized bed incineration process (produced energy sector quantitatively major solid waste Estonia) be binding stabilization, even without addition Hardened samples behaved ductile material, cellulose fibers naturally present gave peat–ash composite plasticity, acting mechanically same way steel glass fiber ordinary reinforced concrete. The effect reinforcement higher cases load displacement composite, making material usable constructions.