Abstract
The ash landfills are a major environmental issue. The use of ash for the highway and railway substructure achieves a double benefit: it significantly reduces the deposited quantities of ash as well as the consumption of natural materials such as crushed stone, gravel and sand. The investigation of engineering properties of fly ash from the power plant in Serbia was conducted at the Laboratory of Soil Mechanics at the Faculty of Civil Engineering in Belgrade. Relevant physical and mechanical properties of ash and mixtures with binders (cement/lime) were investigated. The ash was also tested from the aspect of the potential environmental impact, which primarily depends on the leaching behaviour of the present trace elements. The results of the study showed that fly ash meets technical and environmental requirements and that has the potential for use in highway substructure, such as construction of embankments and stabilization of soft soils. Benefits of utilization of ash and slag was shown in the case of the construction of a high embankment on soft soil on the highway section Obrenovac-Ub in Serbia.
Highlights
Fly ash is a by-product of coal burning in thermal power plants
The objective of this research was to investigate of engineering properties of fly ash from the power plant „Nikola Tesla B“ (TENT B) in Serbia and to investigate benefits of utilization of ash in the case of the construction of a high embankment on soft soil
If subsoil stabilization was to be performed with fly ash, this would reduce settlements, by 30% on average, since the largest deformation of subsoil happen in the surface low bearing and compressible layer
Summary
Fly ash is a by-product of coal burning in thermal power plants. Fly ash is a pozzolan, that is, silicate or aluminum-silicate material that combines with calcium hydroxide in isolated form and in the presence of water (from lime, Portland cement or dust from the calcinator) forming compounds with binding properties. Fly ashes from Serbian power plants have pozzolanic properties and, because of low concentrations of calcium compounds (less than 10 % CaO), they are devoid of self–cementing characteristics. Any reduction of deposits of fly ash and its reuse brings multiple benefits such as: natural resources savings, preventing ecosystem change, reduction of pollution of soil, underground and surface waters and air by selecting the appropriate method of installation of this material. Utilization of fly ash in civil engineering results in significant economic effects, since ash and slag are cheap materials, and the installation method is relatively simple. The objective of this research was to investigate of engineering properties of fly ash from the power plant „Nikola Tesla B“ (TENT B) in Serbia and to investigate benefits of utilization of ash in the case of the construction of a high embankment on soft soil.
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