Fly Ash Activator
Optimising Compressive Strength: Investigating the Ideal
They found an optimal compressive strength of 38 MPa was achieved when the liquid-to-binder ratio was 0.6, and NaOH was used as the alkaline activator. The fly ash-to-GGBS ratio in the mix was 3:1 (405 kg/m 3), and curing was performed at a high temperature using an external heat source. It is worth noting that the liquid-to-binder ratio was ...
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Observations on the rheological response of alkali activated …
This paper reports the influence of activator type and concentration on the rheological properties of alkali-activated fly ash suspensions. A thorough investigation of the …
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Estimation of compressive strength of waste concrete utilizing fly ash …
The data consist of GGBS (kg/m 3), Alkaline activator (kg/m 3), Fly ash (kg/m 3), SP dosage (kg/m 3), NaOH Molarity, Aggregate (kg/m 3), Temperature (°C) and compressive strength as output ...
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Performances and microstructure of one-part fly ash …
Although researchers often use single activator to prepare fly ash geopolymers. However, the application of compound activation system will be beneficial to solve the problems of low efficiency of low pH activator and high cost of high pH activator [28]. The synergistic activation of FA/slag geopolymers with calcium hydroxide/sodium sulfate ...
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Improvement of cemented rockfill by premixing low-alkalinity activator …
Addition of premixed activator to fly ash enhanced the formation of Ca6Si6O17(OH)2, and CaO∙Al2O3∙xSiO2∙yH2O. Activator causes densification of the microstructure and this occurs ...
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Effects of High CaO Fly Ash and Sulfate Activator as a Finer …
In this study, the effects or high CaO fly ash and sulfate activator on cementless grouting material were investigated through LW grouting applied at an actual construction field. The following conclusions can be drawn. (1) CGM could decrease the gel time by about 16.7% compared with OPC. When CGM is applied as a binder for LW grouting in the ...
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Early activation of high volume fly ash by ternary activator …
DOI: 10.1016/j.jenvman.2020.110638 Corpus ID: 218689847; Early activation of high volume fly ash by ternary activator and its activation mechanism. @article{Sun2020EarlyAO, …
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Composition and microstructure of alkali activated fly ash …
All these displacements are indicating that the vitreous component of the fly ash is reacting with the alkali activator and therefore that new 1987 9 10 FAN8 3 5 4 8 1 7 2 Fly ash 1800 1500 6 1200 900 600 300 Wavenumber (cm-1) Fig. 2. FTIR spectra of fly ash and alkali activated fly ash mortars. products of reaction are being formed (the main ...
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Fresh mechanical and durability properties of alkali-activated fly ash …
Alkaline activator solution. Potassium silicate (K 2 SiO 3), potassium hydroxide (KOH), ... ASTM C618-12a (2014) Standard Specification for Coal Fly Ash and Raw or Calcined Natural Pozzolan for Use in Concrete., pp 1–5. Nedeljković M, Li Z, Ye G (2018) Setting, strength, and Autogenous shrinkage of alkali-activated fly ash and slag pastes ...
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Effect of Na2CO3 on the tensile creep of slag-fly ash
The total Na 2 O equivalent (the mass ratio of Na 2 O of hybrid activators to binder) of alkali-activated slag-fly ash system (ASF) was 6%, where the hybrid activator was composed of Na 2 SiO 3 and Na 2 CO 3, and the binder was composed of slag, fly ash and hybrid activator. The binder-sand ratio and water-binder ratio were 1/3 and 0.45 ((water ...
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Fly ash-based artificial aggregates synthesized through alkali
The shortage of natural aggregates caused by massive infrastructure construction has promoted the development of alternative aggregates. In this study, artificial aggregates based on alkali-activated technology were designed and manufactured, where fly ash (FA) and a blended sodium silicate/hydroxide solution were used as the precursor and activator, …
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Investigation of different ways of activation of fly …
Cement industry emits large amount of CO2. One of the ways to reduce this emission is to use cement replacements, such as fly ash, in binding mixtures. Blends …
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Impact of the Fly Ash/Alkaline Activator Ratio on …
The fly ash and alkali activator solution quantities were varied in a range from 1 to 1.75 during preparation to realize the effects of minute changes on geopolymerization and the associated properties. The necessary amount …
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(PDF) Reaction, Phases, and Microstructure of Fly Ash …
The alkaline activator has a significant effect on the microstructure and mechanical properties of fly ash-based alkali activated products. This paper aims to identify the reaction products of fly ...
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Investigation of different ways of activation of fly ash…
The amount of fly ash used as replacement of cement usually does not exceed 35%. However, composites containing much higher quantity of fly ash in the binding material arouse interest [8, 10,11,12,13,14,15]. Portland cement in low-cement mixtures acts as hydraulic component and activator for fly ash.
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Effect of relative GGBS/fly contents and alkaline solution
Effect of activator sodium silicate/sodium hydroxide ratio on strength development for mortars with binders consisting of: (A) GGBS as sole binder (G100), (B) GGBS: fly ash ratio of 3:1 (G75F25 ...
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Early activation of high volume fly ash by ternary activator …
Fly ash, as a by-product generated by the thermal power industry, is the largest industrial waste in the world. Only about 20–30% is used to form blended cement (Fernández …
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Improvements on activated sludge settling and flocculation …
Improvements on activated sludge settling and flocculation using biomass-based fly ash as activator. Pedram Fatehi. Scientific Reports. Biomass-based fly ash and wastewater are undesired products of the pulping industry. Recently, the use of biomass-based fly ash as an adsorbent (i.e., a valued material) for constituents of wastewater effluents ...
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An overview and experimental study on hybrid binders containing …
They concluded that fly ash (FA), blast furnace slag (BFS), metakaolin (MK), rice husk ash (RHA) and palm oil fuel ash ... The effects of ground granulated blast-furnace slag blending with fly ash and activator content on the workability and strength properties of geopolymer concrete cured at ambient temperature. Mater. Des., 62 (2014), pp. 32-39.
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Evaluation of Expansive Soil Amended with Fly Ash and …
This paper presents the use of fly ash (FA) and liquid alkaline activator (LAA) to amend the engineering behavior of expansive soil (ES) based on a series of unconfined compressive strength (UCS), expansion ratio (ER), California bearing ratio (CBR), and free swell index (FSI) tests conducted on various sets of natural and amended ES with different …
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Effects of alkaline-activated fly ash and Portland cement …
This paper studies the effects of sodium-based alkaline activators and class F fly ash on soil stabilisation. Using the unconfined compressive strength test (UCS), the effectiveness of this binder is compared with that of a common cement-based binder. Influence of the activator/ash ratio, sodium oxide/ash ratio and sodium hydroxide concentration was also …
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The Compressive Strength Development of Alkali Activated Fly Ash…
Ground granulated blast furnace slag (GGBFS) and fly ash were used as precursors, and an activator solution prepared by mixing 10 M sodium hydroxide (NaOH) and sodium silicate (Na2SiO3), which has ...
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Fresh mechanical and durability properties of alkali-activated …
The mechanism of activation of fly ash with alkali-activated solutions was described by Palomo et al. in 1999. Later, in 2006 Fernandez-Jimenez et al. studied …
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Impact of Reduced Activator Concentration and Curing …
The compressive test result shows that the maximum water content that can replace the activator solution is 20% by activator mass for fly ash-based geopolymers and 30% by activator mass for ...
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Composition and microstructure of alkali activated fly ash …
Additionally, in the bibliography many references about zeolite synthesis by alkali hydrothermal reaction of coal fly ashes can be found [14], [15], [16], [17].In these works it has been already explained that the type of zeolite formed at the end of the process will mainly depend on the experimental conditions (nature and concentration of the activator, curing …
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The effects of ground granulated blast-furnace slag blending with fly
The parameters studied were GGBFS content as a replacement of fly ash, alkaline activator content, and the sodium silicate to sodium hydroxide ratio (SS/SH) in the activator. Two series of geopolymer concrete mixtures with different amounts of alkaline activator were used in this study. In series A, four geopolymer mixtures were prepared with ...
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Observations on the rheological response of alkali activated fly ash …
This paper reports the influence of activator type and concentration on the rheological properties of alkali-activated fly ash suspensions. A thorough investigation of the rheological influences (yield stress and plastic viscosity) of several activator parameters, including: (i) the cation type and concentration of alkali hydroxide and (ii) the alkali-to-binder …
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Strength Development of Soil–Fly Ash Geopolymer: …
In this study, fly ash was added to residual soil to produce soil–fly ash geopolymer bricks. This study investigated the effects of fly ash/soil, alkali activator/ash, Na 2 Si O 3 / KOH (or NaOH), additional water content, curing condition, and curing temperature on the compressive strength of soil–fly ash geopolymer. The results showed that the optimum …
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Influence of Activator and Superplasticizer on Fly Ash …
The samples with the activator to fly ash ratio of 0.50 were tested. Figure 5 gives the flow value of geopolymer mortars using different activator concentrations and admixture content. The workability is decreased with an increase in activator concentration.
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Effect of sodium carbonate/sodium silicate activator on …
Reactions between the fly ash/slag composite mix and the Na2CO3/Na2SiO3 activator were monitored through Isothermal conduction calorimetry. The resulting products were analyzed with the help of ...
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