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 …
WhatsApp: +86 18221755073
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.
WhatsApp: +86 18221755073
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] …
WhatsApp: +86 18221755073
In order to develop a cost-effective one-part alkali-activated recycled coarse aggregate concrete (AARC), fly ash sinking beads (FASB), granulated blast furnace slag …
WhatsApp: +86 18221755073
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 …
WhatsApp: +86 18221755073
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 …
WhatsApp: +86 18221755073
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 ...
WhatsApp: +86 18221755073
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.
WhatsApp: +86 18221755073
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 ...
WhatsApp: +86 18221755073
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.
WhatsApp: +86 18221755073
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 …
WhatsApp: +86 18221755073
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 ...
WhatsApp: +86 18221755073
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 …
WhatsApp: +86 18221755073
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.
WhatsApp: +86 18221755073
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.
WhatsApp: +86 18221755073
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 …
WhatsApp: +86 18221755073
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 …
WhatsApp: +86 18221755073
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 ...
WhatsApp: +86 18221755073
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.
WhatsApp: +86 18221755073
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%.
WhatsApp: +86 18221755073
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 …
WhatsApp: +86 18221755073
The addition of fly ash in modified steel slag changed its chemical and mineral composition. The aluminium in fly ash reacted with calcium and iron in steel slag to form C 4 AF. The silicon in fly ash decreased the content of silicon in modified steel slag and then formed the Ca-Si-Al-O glass.
WhatsApp: +86 18221755073
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).
WhatsApp: +86 18221755073
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.
WhatsApp: +86 18221755073
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 …
WhatsApp: +86 18221755073
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 …
WhatsApp: +86 18221755073
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 …
WhatsApp: +86 18221755073
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 …
WhatsApp: +86 18221755073
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 …
WhatsApp: +86 18221755073
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.
WhatsApp: +86 18221755073
Materials. The experimental materials included the following: fly ash with a density of 2.55 g/cm 3, slag with a density of 3.1 g/cm 3 and a specific surface area of 429 m 2 /kg, technical-grade water glass with a modulus of 3.3 and a content of 34%, analytically pure sodium hydroxide whose NaOH content is over 96%, analytically pure sodium hypochlorite solution as …
WhatsApp: +86 18221755073
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%....
WhatsApp: +86 18221755073
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 …
WhatsApp: +86 18221755073
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 …
WhatsApp: +86 18221755073
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.
WhatsApp: +86 18221755073
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 ...
WhatsApp: +86 18221755073
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.
WhatsApp: +86 18221755073
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 ...
WhatsApp: +86 18221755073