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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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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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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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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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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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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Preparation of water-quenched manganese slag and fly ash …

In this paper, S95 grade ultrafine mineral admixture (UMA) was prepared by water quenched manganese slag and fly ash 1:1 compound mechanical ball milling to a specific …

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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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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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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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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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Fly Ash

1.2.7 Chemical Composition. Chemical composition of fly ashes include silica (SiO 2), alumina (Al 2 O 3), and oxides of calcium (CaO), iron (Fe 2 O 3), magnesium (MgO), titanium (TiO 2), sulfur (SO 3), sodium (Na 2 O), and potassium (K 2 O), and unburned carbon (LOI). Amongst these SiO 2 and Al 2 O 3 together make up about 45–80% of the total ash. The sub …

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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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Fly ash and slag: standards and specifications—help or hindrance?

From technical, economic and ecological points of view, siliceous by-products are now recognized and accepted as desirable and vital constituents of concrete. Current specifications for such materials tend to be restrictive to some extent, however, and in many countries there are separate standards for each admixture. These in turn inhibit the wider use of these mineral additions to …

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Toughness study of polyacrylamide-modified slag/fly ash-based …

PAM's molecular weight and content have different effects on the toughness of AASF. ... This study investigated the mechanical properties and toughness of slag/fly ash-based alkali-activated cementitious materials (AASF) by incorporating PAM with different molecular weights and dosages. ... Changes in mineral composition, growth of calcite ...

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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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Co-melting mechanisms for municipal solid waste incineration fly ash

Flux agents, such as B 2 O 3 and SiO 2, were added to decrease the melting temperature of fly ash, thereby reducing energy consumption. Gao et al., 2020, 2021 used B 2 O 3 as a flux agent to reduce the melting temperature of MSW incineration fly ash (MSWI-FA). The ash flow temperature (FT) decreased from 1211 °C to 986 °C upon adding 15% B 2 O 3 to …

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Workability, autogenous shrinkage and microstructure of alkali

The Ca/Si ratio of gels varied with the slag content [73]. with the increase of fly ash content, the reduction of Na + in N-A-S-H gel was observed, meanwhile the distribution of Ca/Si ratios was a constantly increased.

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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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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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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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(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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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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An investigation into the composition of the mineral phase of fly ash

The results show that the fly ash analyzed in this study was primarily comprised of mineral phases rich in SiO₂, Al₂O₃, and Fe₂O₃. The primary crystalline phases identified were mullite and quartz. Notably, iron-rich microspheres within the fly ash encompass hematite, magnetite and glassy phases.

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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 and slag

The use of GBFS started in 1865 in Germany [3], while the use of fly ash is dated back to the beginnings of the 20th century [2]. The world-wide production of these industrial by-products is: fly ash about 900–1000 million tons [2,8] …

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(PDF) Preparation of water-quenched manganese slag and fly ash

In this paper, S95 grade ultrafine mineral admixture was prepared by water quenched manganese slag and fly ash 1:1 compound mechanical ball milling to a specific surface area of 714 m2/kg. Its ...

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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

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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Thermal stability and strength degradation of lithium slag …

The SEM examination showed that the fly ash particles varied in size, ranging from nanosized particles up to 10 μm. The bright fly ash cenospheres represent the presence of higher iron content evident from EDS analysis. The lithium slag showed the presence of calcium-rich aluminosilicates in the form of micro and nano-sized angular particles.

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