effect of activation technique on fly ash

Effect of sodium sulfate on the alkali activation of fly ash

The effect of alkali concentration and curing temperature regime on fly ash-based geopolymer pastes was investigated in this study by using NaOH solutions.

Effects of Activation and Modification on the ...

The fly ash was activated and modified respectively by acid and alkali- soluble method, BET, XRD, SEM and EDS were used to investigate the specific surface area, phase, surface microstructure and the major elements of the original coal fly ash and the modified sample.

Role of additives in improved thermal activation of coal ...

In order to clarify the activation effect of Na 2 CO 3 and NaOH on coal fly ash and further clarify the activation mechanisms, X-ray diffraction (XRD) technique was used to analyze the crystallographic texture of coal fly ash.

Microcalorimetric study of the effect of calcium hydroxide ...

The objective of this research is to know, through the flow of heat released, the effect of the addition of calcium hydroxide and the temperature on the alkaline activation of coal fly ash with a solution of sodium hydroxide. The heat flow of the samples was measured from an isothermal conduction ...

Effect of mechanochemical activation on reactivity of ...

Combinations of cement kiln dust and fly ash were used to develop cementitious material through mechanochemical activation. Mixture combinations made with two different proportions were subjected to various grinding regimes to activate the material.

Effectiveness of fly ash activation on the corrosion ...

By adopting various activation techniques such as physical, thermal and chemical methods, hydration of fly ash blended cement concrete was accelerated and thereby improved the …

The Effect of Mechano-Chemical Activation of Fly Ash ...

7. Investigation of the effects of fly ash – nanoparticle combination on flowability and resistance to segregation as well as strength development of eco-friendly SCC. Based on the established correlations, it was concluded that the use of nano-engineering approach and mechano-chemical activation of fly ash can provide an improved performance of

Studies on Physio Chemical Properties of Fly Ash for their ...

Studies on Physio Chemical Properties of Fly Ash for their Effective Alkali Activation Revathi 1, Jeyalakshmi * Rajamane2, Sivasakthi, Dhinesh3 1Department of Chemistry, SRM University 2Centre for Advance Concrete Research (CACR), SRM University 3Scientific Officer, Centre for Advance Concrete Research (CACR), SRM University

Chemical Activation of Low Calcium Fly Ash Part II: Effect ...

evolution studies reveal that the possible surface renewal effect of the fly ash particles may be key to the effective chemical activation. The optimization studies show that the sodium hydroxide concentration between 0.05 N and 0.1N produces the best alkali activation effect for the low calcium fly ash. ACKNOWLEDGEMENTS

Effect of the Alkali-Activation on the Mechanical Property ...

Effect of the Alkali-Activation on the Mechanical Property of Geopolymer Composite ... "Effect of the Alkali-Activation on the Mechanical Property of Geopolymer Composite", Materials Science Forum, Vol. 804, pp. 15-18, 2015 ... The effects of fly ash amount and water/binder ratio were investigated on compressive strength and heavy metals ...

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 ...

STRENGTH DEVELOPMENT OF CONCRETE WITH FLY ASH …

STRENGTH DEVELOPMENT OF CONCRETE WITH FLY ASH ADDITION ... The chemical process is due to the activation of the non-crystalline silica, the major constituent of fly ... the effect of fly ash on setting time should be analysed considering the amount of water required to get a normal consistency.

Effect of Water Ratio in Fly-Ash Concrete on the Process ...

Effect of Water Ratio in Fly-Ash Concrete on the Process of Alkali Activation Rostislav Šulc Department of Construction Technology CTU in Prague, Faculty of Civil Engineering e-mail: [email protected] Abstract Since 2003 research work of fly-ash alkali activation has been proceeding. This work is provided by the

(40m) Effect of Activation Condition for Production of ...

(40m) Effect of Activation Condition for Production of Activated Carbon from Fly Ash

An XRD study of the effect of the SiO2-Na2O ratio on the ...

An XRD study of the effect of the SiO2-Na2O ratio on the alkali activation of fly ash.pdf - Download as PDF File (.pdf), Text File (.txt) or read online. Scribd is …

Effect of the activation method on the ... - DeepDyve

Read "Effect of the activation method on the properties and adsorption behavior of bagasse fly ash-based activated carbon, Fuel Processing Technology" on DeepDyve, the largest online rental service for scholarly research with thousands of academic publications available at your fingertips.

SINTEF REPORT - Forskning, teknologi og innovasjon

The third activation technique, mechanical activation, appears to be one of the more promising technique. One possibility is the extraction of the finer, more reactive particles from the bulk fly ash …

Effect of internal alkali activation on pozzolanic ...

Fly ash is often added to concrete as a filler and to improve strength and durability. The pozzolanic reaction between the silica and alumina in low-calcium fly ash and the Ca(OH)2from hydrated...

Activation of fly ash and its effects on cement properties 1

Activation of fly ash and its effects on cement properties 1 Yueming Fan *, Suhong Yin, Zhiyun Wen, Jingyu Zhong South China University of Technology, Guangzhou, 510641, People's Republic of China Manuscript received 23 December 1997; accepted manuscript 25 September 1998 Abstract A new method of fly ash activation with addition of Ca(OH) 2

Effects of Portland cement on activation mechanism of ...

TY - JOUR. T1 - Effects of Portland cement on activation mechanism of class F fly ash geopolymer cured under ambient conditions. AU - Kaja,A.M.

Mechanical Activation of Fly Ash by High Energy Planetary ...

Fly ash has a high potential to be converted into geopolymeric material due to its abundant supplies and low cost. However, large particle size of the fly ash caused low reactivity which results in low properties of the end product. The improvement on the fly ash properties by mechanical activation allows it as a new possible raw material in wider application besides solving the low reactivity ...

EVALUATION OF IN PLACE STRENGTH OF HIGH-VOLUME …

The fly ash mixture was designed so that the early strengths (3, and 7 days) of the mixture is comparable to the Portland cement control mixture. This is how, in practice, the concrete producer who is concerned about early-age strengths and wants to maximize fly ash use will approach the fly ash mixture proportioning.

Effect of the Alkali Metal Activator on the Properties of ...

The present study investigates the effect of mainly Na + and K + on the physical and chemical properties of fly ash-based geopolymeric binders both before and after setting has occurred. A variety of tests were conducted, including rheological measurements, various leaching tests, compressive strength testing, specific surface area ...

THE TYPE OF MECHANO-ACTIVATOR EFFECT ON …

characteristics of coal fly ash have been enhanced [11]. This study aimed enhanced reactivity fly ash by mechanical activation with a vibratory ring mill, planetary ball mill and conventional ball mill as well. At the same time, the best mechanical activation technique finding for mechanical activa-tion of fly ash could be the aim of this study.

Abstract: Effect of Activation Condition for Production of ...

Activated carbon (AC) was produced from Waste oil fly ash (OFA) by physico-chemical treatment method. The OFA was first treated with different types of oxidizing agent followed by steam gasification at different activation temperature.

INVESTIGATION OF FLY ASH ACTIVATION WITH CHEMICAL ...

based on the substitution of clinker with fly ashes usually suffer from lower early strengths (Fraay, 1990, Huettl, 2000, Lee C. Y. et al., 2003, Mueller et al.). Several studies have been published regarding the activation of fly ash through chemical compounds, both inorganic (e.g.

CONCRETE Optimizing the Use of Fly Ash in Concrete

the fly ash, the calcium content is also useful in predicting how effective the fly ash will be in terms of reducing the heat of hydration (Thomas 1995), controlling expansion due to alkali-silica reaction (Shehata 2000), and providing resistance to sulfate attack (Shashiprakash 2002). These issues are addressed in sections Effect of Fly Ash on the

Influence of activation of fly ash on the mechanical ...

Use of fly ash extremely enhanced all concrete strengths after exposure to elevated temperatures. 3. Activation of fly as has a pronouncing effect on improving concrete properties at early ages. 4. Aquis Na 2 SiO 3 activator is the superior activator for fly ash in view of enhancing concrete compressive, splitting tensile and flexural strengths. 5.

The effect of temperature on micro-mechanical properties ...

The main crystalline phases of fly ash identified were quartz, mullite and cristobalite. According to the XRD results for fly ash based geopolymer without thermal treatment (Curve b), this geopolymer was more amorphous than fly ash, which could be attributed to that the alkali-activation process can change vitreous structure and dissolve a

Alkaline Activation, Procedure for Transforming Fly Ash ...

Alkaline activation is a chemical process in which a powdery aluminosilicate such as a fly ash is mixed with an alkaline activator to produce a paste capable of setting and hardening within a …

(PDF) Effect of mechanical activation of fly ash added to ...

Recycling fly ash is a good example of valorization of waste. It gives a solution the environmental problem by avoiding land filling, and reducing CO2 emission in the atmosphere.

mechanical activation of power Gábor Mucsi station fly ash ...

by grinding. the objective of this paper is to investigate the effect of mechanical activation of fly ash by grinding on physico-chemical and minerological properties. it can be established that there are numerous techniques for mechanical activation of fly ash, e.g. planetary ball mill, vibratory

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