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Characteristics of Preplaced Aggregate Concrete Fabricated with …
This study assesses the characteristics of preplaced aggregate concrete prepared with alkali-activated cement grout as an adhesive binder. Various binary blends of slag and fly ash without fine aggregate as a filler material were considered along with different solution-to-solid ratios. The properties of fresh and hardened grout along with the properties of hardened …
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A systematic research on ed concrete: The effects of content
In total, 39 mixes of specimens were prepared in this study to examine the effects of content, fly ash, slag powder, silica fume and water-to-binder ratios on the properties of ed concrete specimens. ... The properties of ed concrete were more sensitive to silica fume with different addition levels compared to other mineral ...
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Preparation and performance optimization of fly ash- slag- red …
Cement production emits a large amount of CO 2 into the atmosphere and consumes significant mineral resources, necessitating urgent green transformation in this traditional industry. To address carbon emissions in the building materials sector and effectively utilize industrial solid waste, this study presents the preparation of geopolymer mortar using a …
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Effect of CaO on the shrinkage and microstructure of alkali …
Measures that have been employed to mitigate the early-age shrinkage of AAS includes the addition of mineral admixtures, such as fly ash or metakaolin [9], [10], reducing the surface tension of pore solutions [11], [12], high temperature curing [13], [14], use of internal curing materials [15], fibers [16], and expansion agents [4], [17].These approaches have …
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Fly ash and slag
Fly ash particles from Polish power stations: a) siliceous fly ash b) calcium fly ash c) fluidized bed combustion fly ash [12]. In order to reduce CO 2 emissions, the power industry started to burn coal with addition of other fuels, mainly biomass (zero-emission fuel).
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Alkali and sulfate effects on mechanical properties and …
Slag contains chemical components such as CaO and SiO 2. The silicon-rich phase C-S-H formed under the action of an activator has stronger atomic bonds and greater …
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Why use Fly Ash and Slag in Concrete?
Another difference between slag and fly ash is that while fly ash will rarely surpass 35% of the cement content, slag can substitute 50% of the cement content, or even higher for different applications. This contributes to the large cost savings from slag cement. ... Fly ash and Slag will typically be 18% cheaper than Portland cement. When a ...
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Effects of Blended Steel Slag-Superfine Fly Ash Mineral …
The chloride permeability of concrete with slag or (20wt%, 30wt%, and 40wt% of binder) and binary slag and fly ash (the ratio of slag and fly ash 5:5, 4:6 and 6:4) was investigated in this study.
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Fly ash, silica fume, slag & other mineral by-products in concrete
Semantic Scholar extracted view of "Fly ash, silica fume, slag & other mineral by-products in concrete" by V. Malhotra et al. Skip to search form Skip to main content Skip to account menu. Semantic Scholar's Logo. Search 224,413,768 papers from all fields of science. Search.
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The Impact of Fly Ash on the Properties of Cementitious
Fly ash is an industrial waste residue discharged from coal-fired power plants, known as an "urban mineral". In 2020 alone, the annual discharge of fly ash in China reached …
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Investigation and Utilization of Alkali-Activated Grouting
Furthermore, the sample contains weathered mineral particles of larger sizes in certain areas. These particles are mainly composed of quartz and exhibit heterogeneous hardness properties. ... Tuo, Y. Effect of Different Alkali Equivalent, fly Ash and Slag Content on the Mechanical Properties and Microstructure of Alkali-activated Fly Ash-slag ...
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Modeling the hydration of concrete incorporating fly ash or slag
Maekawa [10], [11], [12] proposed a general hydration model (DuCOM) for concrete incorporating fly ash and slag. Fly ash and slag reactions are treated separately from those of ordinary Portland cement, and some interactions are taken into account through the free water content and the calcium hydroxide concentration.
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(PDF) Mechanistic Investigation for Solidification of Pb …
This study obtained the optimal solidification conditions of fly ash from a grate incinerator, which are mineral slag content of 40%, activator content of 4%, and water content of 27.5%.
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Fresh and mechanical properties of SCC with fly ash and copper slag …
The physical properties of cementing and secondary cementitious materials are tabulated in the Table 1, including inert materials such as fine aggregate and coarse aggregate.Microstructures of copper slag, fly ash and cement were observed with the help of SEM analysis and presented in Fig. 1a, Fig. 1b, Fig. 1c respectively. The suitability of fine aggregate …
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Mechanistic Investigation for Solidification of Pb in Fly Ash by
With the increase in municipal solid waste incineration, fly ash, its heavy metal content, and its disposal methods have attracted wide attention. This work investigates if the alkali-activated mineral slag gel solidification of heavy metals in fly ash has positive significance in promoting the harmless treatment of fly ash. This study obtained the optimal solidification …
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Slag vs Fly Ash: Unveiling the Power of Byproducts
Similar to slag, fly ash offers numerous advantages that have led to its widespread use in construction, including: Supplementary Material. One of its most notable qualities is its pozzolanic properties, which means it reacts with calcium hydroxide in the presence of water to form cementitious compounds. When mixed with concrete, this enables ...
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The Impact of Fly Ash on the Properties of Cementitious
This paper presents a novel low-carbon binder formulated from fly ash (FA), ground granulated blast furnace slag, steel slag, and desulfurization gypsum as a quaternary solid waste-based material. It specifically examines the influence of FA content on the mechanical properties and hydration reactions of the quaternary solid waste-based binder. The mortar test …
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Slag vs Fly Ash: Unveiling the Power of Byproducts
When it comes to whether you should choose slag vs fly ash, slag may be the preferred choice for projects requiring high strength and durability. Its excellent resistance to …
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The Impact of Fly Ash on the Properties of Cementitious …
Research has shown that the high alkalinity of steel slag can effectively stimulate the volcanic ash activity of fly ash and promote the breaking of active Si-O-Si, Si-O-Al, and Al-O-Al bonds inside …
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Influence of Different Parameters on the Performance of Alkali
The effects of four parameters of fly ash content, water glass modulus, water glass solid content, and water–solid ratio on the working performance and mechanical properties of alkali-activated slag–fly ash composite cementation system were discussed. The gelling system was studied by microscopic experiments such as SEM and FTIR.
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Effect of curing conditions and mineral admixtures on strength of
This study investigates the effects of curing conditions, fly ash, and silica fume on the strength of alkali-activated steel slag. Specifically, it examines ambient air conditions at 18–20 °C and 59 %-80 % relative humidity, as well as curing in air at 20 …
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Sustainable enhancement of fly ash/steel slag composite cement: …
The mineral components of fly ash, including mullite and amorphous aluminosilicate, exhibit high reactivity. During hydration, they can react with calcium hydroxide (Ca(OH) 2 ) generated from cement hydration, thereby further …
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Comparison of environmental impacts of fly ash and slag as …
Fly ash and slag are among the most used wastes as supplementary cementitious materials (SCM) for partially replacing cement in concrete. Globally, these by-products are generated at a substantial scale, with fly ash production ranging from 900 to 1000 million tonnes and slag production from 140 to 330 million tonnes annually [15, 48].Herath et al. [22] reported …
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Hydration and Hardening Properties of High Fly-Ash Content Gel …
As more and more mines utilize the cemented paste backfill (CPB) mining method, the demand for reducing backfill cost and carbon footprint is increasing and becoming more critical. In this work, a new backfill gel binder made with 40 wt.% of low-quality Class F fly ash (FCM) is proposed to replace ordinary Portland cement (OPC). The binder hydration and gel …
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Performance of coal gangue concrete with fly ash and ground …
Some studies have demonstrated that adding an appropriate amount of supplementary cementitious materials, such as fly ash (FA) and ground-granulated blast slag (GGBS), can improve the bonding strength between concrete and aggregates ... and the torque first increased and then decreased with an increase in the mineral powder content.
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Waste glass as partial mineral precursor in alkali-activated slag/fly
Many researchers have found that the binary system of alkali-activated slag/fly ash has an improved mechanical properties and durability [11], [12], [13]. The enhanced mechanical performance and durability of alkali-activated slag/fly ash have attracted great attention by both scientific community and construction industry.
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Mechanistic study on the utilisation and mineral formation of
Fly ash, a significant byproduct of municipal solid waste incineration, garners attention for its harmless treatment and resource utilisation. Existing research has demonstrated the viability of incorporating fly ash into the sintering process and explored its influence on the sintering bonding phase.
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Micromechanics-guided development of a slag/fly ash-based …
The solid precursors used in this study were ground granulated blast furnace slag and Class F fly ash according to ASTM 618 [32] produced locally in the Netherlands. The material density of slag and fly ash are 2890 kg/m 3 and 2440 kg/m 3, respectively. The d50 particle size for slag is 17.88 μm and 33.19 μm for fly ash.
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Fresh and mechanical properties of SCC with fly ash and copper slag …
It was observed that the increase of fly ash and copper slag shows the improvement in the fresh properties. 20% fly ash used as optimum to replace copper slag in fine aggregate. 40% of copper slag ...
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Use of Fly Ash and Slag in Concrete: A Best Practice Guide
Fly ash: the use of low calcium fly ash (CSA Class F and Cl with CaO content < 20%) increases resistance to sulphate atta ck. Fly ashes with more than 20% CaO should be investigated for sulphate ...
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