Fly ash is a sustainable material used in the construction field to fill voids, and is used for backfilling in the coal mines. It is especially attractive for embankment construction over weak …
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Valorization of Boron Mine Tailings in Alkali-Activated Mortars ... were combined with sodium silicate to activate the binding phase. Double hooked-end steel fibers were incorporated into the alkali-activated mix in varying volumetric proportions up to 3% to enhance its ductility. ... W., X. Yao, T. Yang, and Z. Zhang. 2018. "The degradation ...
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ft.]) were cast using W/CM in the range of 0.31 to 0.46, various types of fly ash with replacement levels of 56 or 58%, and various types of normal density and lightweight aggregates.Surface ...
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There are numerous successful attempts on the utilization of fly ash either alone or mixed with lime, gypsum or both (Mishra and Rao, 2006) and it has been recognized that its …
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Ash blend compositions are varied according to a simplex-centroid mixture experimental design. Activator to ash mass ratios are varied from 0.8 to 2.0, the higher value being applied for ash compositions with higher Si/Al ratio. The impact of ash blend composition on early strength is adequately modeled by an incomplete quadratic mixture model.
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A review on the geotechnical response of fly ash-colliery spoil blend and stability of coal mine dump. Shahbaz Dandin, Mrudula Kulkarni, Makrand Wagale and Sandeep Sathe. Journal: Cleaner Waste Systems, 2022, Volume 3, Page 100040. …
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Growing dependence on coal-fired power plants for electrical generation in many countries presents ongoing environmental challenges. Burning pulverized coal in thermal power plants (TPPs) generates large amounts of fly ash (FA) that must be disposed of or otherwise handled, in an environmentally-sound manner. A possible option for dealing with fly ash is to …
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The fly ash particles are formed upon the solidification of molten material suspended in the exhaust gases upon coal combustion. The rapid cooling of these particles leads to fly ashes generally being spherical, ranging in size from 0.5 to 300 μm.Furthermore, the rapid cooling of the ash prevents crystallisation of mineral phases, resulting in fly ash consisting primarily of a …
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This study used a synthesized coal fly ash-based composite coagulant (containing Al ³⁺, Fe ³⁺, Mg ²⁺, Si ⁴⁺ and Ca ²⁺ ) to remove impurities such as Fe, Mg, Mn, Ni, Al, Si, Ca ...
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The metakaolin-fly ash (MK-FA) blend activated by sodium-based alkaline liquid was used as the alkali-activated binder, and MS from crushed limestone was used as fine aggregate for the preparation ...
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Thermal performance, combustibility, and fire propagation of fly ash-metakaolin (FA-MK) blended geopolymer with the addition of aluminum triphosphate, ATP (Al(H2PO4)3), and monoaluminium phosphate ...
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Request PDF | Two-step method for preparation of NaA-X zeolite blend from fly ash for removal of cesium ions | Pure zeolites can be synthesized from silica extracts obtained from fly ash by ...
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The developed FA/MT-based geopolymers represent a promising green material for both the remediation of As-bearing lands and the construction industry. industrial solid wastes (e.g., fly ash, red mud, mine tailing, etc.) by alkali activation has been demonstrated to be an effective alternative to immobilize arsenic into the geopolymer matrix.18 ...
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Herein we demonstrate that geopolymerization of a mixture of the toxic-bearing mine tailings and the coal fly ash (FA) with a blending of sodium hydroxide (NaOH) and sodium silicate solution can ...
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Geoenvironmental and Geotechnical Issues of Coal Mine Overburden and Mine Tailings. Chapter. Fly Ash Based Geopolymer Modified Bitumen (GMB) binder—An Overview ... This geopolymer modified bitumen binder (GMB) blend reduces carbon emissions while increasing chemical and thermal effects. Geopolymer exhibits good mechanical qualities at …
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In this paper, class-C fly ash (FA) and ground granulated blast-furnace slag (GGBS)-based geopolymer activated in NaOH and NaOH + Na 2 SiO 3 was studied regarding setting time, compressive strength, porosity, microstructure, and formation of crystalline phases. When comparing the effects of alkali type on the FA and GGBS geopolymer composites, …
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A review on the geotechnical response of flyash-colliery spoil blend and stability of coal mine dump Shahbaz Dandin ⁎, Mrudula Kulkarni, Makrand Wagale, Sandeep Sathe
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Geopolymers have been considered a promising replacement for ordinary Portland cement (OPC) as a binding material. As geopolymers can be produced from alumina- and silica- rich industrial and agro-industrial waste materials and by-products such as blast furnace slags, mine tailings, coal ashes, etc., geopolymer technology has a great potential for environmental management …
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ft.]) were cast using W/CM in the range of 0.31 to 0.46, various types of fly ash with replacement levels of 56 or 58%, and various types of normal density and lightweight aggregates.Surface ...
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This study aims to determine the engineering properties of concrete with a ternary blend of fly ash, wheat straw ash, and maize cob ash. A total of 73 concrete cubes, 42 reinforced concrete prisms ...
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From the perspective of resource recovery and environmental protection, coal gangue-fly ash cemented backfill coal mining has become an important direction for the green …
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A treatment process for Acid mine drainage (AMD) using coal fly ash (CFA) was developed. AMD was treated with CFA as the alkaline agent at different CFA: AMD ratios and pH, electrical conductivity (EC) evolution monitored over time. In a separate
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This document presents a study on the strength, porosity, and corrosion resistance of mortars made with ternary blends of ordinary Portland cement, rice husk ash, and fly ash. The results showed that ternary blends produced …
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Ash obtained from coal and biomass combustion can be characterized into two types, which are bottom ash and fly ash (Agrela et al., 2019; Clarke and Preto, 2011).Bottom ash is composed of the residual ash that settles on the bottom of the boiler after combustion, while fly ash is the finer coal or biomass ash that floats into the exhaust stacks and is collected by …
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DOI: 10.1016/j.clwas.2022.100040 Corpus ID: 252767251; A review on the geotechnical response of fly ash-colliery spoil blend and stability of coal mine dump @article{Dandin2022ARO, title={A review on the geotechnical response of fly ash-colliery spoil blend and stability of coal mine dump}, author={Shahbaz Dandin and Mrudula Sanjay Kulkarni and Makrand Wagale and …
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This study investigates the potential approach of utilising CO 2 to produce carbonated fly ash (CFA) in a cement blend for new 'green' construction materials. The aqueous fly ash (FA) carbonation experiments are performed in a batch ... Tu et al., 2015), mine tailings (Meyer et al., 2014), cement kiln dust (Huntzinger et al., 2009), and FA ...
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We previously studied the feasibility of using GF fly ash in cemented backfill mining (Li et al., 2020); the slag-fly ash-based cemented material system disintegrates the network structure of the glass body in the BFS under the FGD gypsum and GF fly ash excitation, such as [SiO 4] 4− and [AlO 4] 5−, and the microscopic physical-encapsulation produced by the dense …
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The mixture was divided into three different groups, with constant water to fly ash ratio of 0.1, and different alkaline content: 0.4, 0.45, and 0.5 of fly ash rather than two curing techniques ...
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Thermal performance, combustibility, and fire propagation of fly ash-metakaolin (FA-MK) blended geopolymer with the addition of aluminum triphosphate, ATP (Al(H 2 PO 4) 3), and monoaluminium phosphate, MAP (AlPO 4) were evaluated in this paper.To prepare the geopolymer mix, fly ash and metakaolin with a ratio of 1:1 were added with ATP and MAP in a …
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Strength and Microstructure of Class-C Fly Ash and GGBS Blend Geopolymer Activated in NaOH & NaOH + Na. 2. SiO. 3. Sasui Sasui . 1, Gyuyong Kim . 1, *, Jeongsoo Nam . 1, Tomoyuki Koyama . 2. and ...
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