The effect of grinding on the physical properties of fly ashes and a portland cement clinker

Bouzoubaa, N.; Zhang, M.H.; Bilodeau, A.; Malhotra, V. M.

doi:10.1016/s0008-8846(97)00194-4

Cited by 90 publications

(40 citation statements)

References 5 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…In this way, the material is shifted into a metastable state resulting in its higher reactivity. An enhanced reactivity of various materials such as fly ash [7] or blast furnace slag [6] after the mechanical activation have been observed before. Chemical activation improves the reactivity through altering the pH of the solution, where the hydration reaction should occur.…”

Section: Introductionmentioning

confidence: 75%

Valorisation of Stainless Steel Slags as a Hydraulic Binder

Krisková¹,

Pontikes²,

Zhang³

et al. 2013

Acta Metall Slovaca

View full text Add to dashboard Cite

This work is focused on exploring various cold and hot stage treatment paths of stainless steel slag as a tool to improve its hydraulic properties. At a cold stage, mechanical and chemical activation was applied on industrial stainless steel slag; and it was found that both activation methods effectively improve the reactivity of the studied slag. In addition, the detailed investigation of hydration on two major phases, γ -C 2 S and merwinite, revealed that their hydration resulted in the formation of C -S -H gel, typically formed during the hydration of OPC. Regarding the hot stage treatment, the combination of the chemistry modification with the addition of fly ash at 30 wt. % and fast cooling by means of water quenching resulted in a complete amorphisation of the material. Ultimately, the produced material possessing similar properties to granulated blast furnace slag could be used as a latent hydraulic material in blended cements.Keywords: stainless steel slag, γ -dicalcium silicate, merwinite, hydration, SEM IntroductionStainless steel production consists of the following three steps: melting of stainless steel scrap in an electric arc furnace (EAF), carbon removal via argon oxygen decarburization (AOD) or vacuum oxygen decarburization (VOD) process and final steel treatment and alloying in a ladle, called ladle metallurgy (LM) [1]. A relatively large amount of slag is generated in each of these steps resulting in an annual worldwide stainless steel slag production of more than 10 Mt [2]. EAF slag is typically valorized as aggregate for road constructions, while slags from secondary refining processes (AOD, LM) are more problematic to be valorized because of their powdery nature, free CaO and MgO content and a potential leaching of heavy metals. A promising higher value applications such as their use as a hydraulic binder, have been proposed for these slags [3]. Secondary stainless steel slags mainly consist of γ -dicalcium silicate (γ -C 2 S) and merwinite (C 3 MS 2 ), while both these phases are considered to be non -hydraulic or only mildly hydraulic [4,5]. Thus, the reactivity of these phases needs to be improved in order to valorise them as a binder.

show abstract

Section: Introductionmentioning

confidence: 75%

Valorisation of Stainless Steel Slags as a Hydraulic Binder

Krisková¹,

Pontikes²,

Zhang³

et al. 2013

Acta Metall Slovaca

View full text Add to dashboard Cite

show abstract

“…According to Schiller and Ellerbrock [10,11] , water demand is composed of three fractions: low proportion of chemical water needed to form the initial hydration products, the second proportion needed to lubricate the initial hydration products, and a large amount of water to lubricate the surfaces of the cement grains. PG and CLS are usually used as retarder and water reducer, respectively, so both of them can help lubricate the surface of cement grains.…”

Section: Resultsmentioning

confidence: 99%

Grey Connection Analysis between Cement Particle Size Distribution and Compressive Strength

Sun¹,

Liu²,

Shui³

et al. 2015

Proceedings of the 2015 International Conference on Architectural, Civil and Hydraulics Engineering

View full text Add to dashboard Cite

This paper studied the effect of triethanolamine(TEA), glycerin(PG) and lignosulphonate(CLS), used as grinding aids respectively, on cement particle size distribution and mortar strength. Grey connection analysis was made between cement particle size distribution and compressive strength. Results showed that TEA and CLS significantly increased the volume proportion of particles with diameter less than 10μm and decreased the volume proportion of particles with diameter larger than 30μm. PG showed opposite effect. According to grey connection index, cement particles with diameter ranging from 10μm to 20μm played a decisive role in the early compressive strength, and particles with diameter between 20μm and 30μm took a major effect on the late compressive strength.

show abstract

“…The drawback of these technologies is that only a certain part of the total mass is utilized and the rest is landfilled. Furthermore, the pozzolanic activity is not improved [9]. A possible option might be the combined application of grinding and classification as a closed circuit by classification of the fine particles, then mechanical activation of the coarse fraction by grinding.…”

Section: Mechanical Activationmentioning

confidence: 99%

Mechanical activation of power station fl y ash by grinding – A review

Mucsi¹

2016

Epitoanyag - JSBCM

View full text Add to dashboard Cite

Power station fly ash has good application possibilities mainly in the construction industry, nevertheless, significant amount is landfilled due to their relatively low reactivity and heterogeneity. Hydraulic properties of fly ashes can be tailored by mechanical activation achieving a higher added value product, for example supplementary cementing materials (scms). the improved properties are higher specific surface area and desired particle size distribution (containing submicron size particles) as well as higher amount of reactive components that can be optimized 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 mill or stirred media mill. on the other hand, most of the results reported in the literature are focusing on material related investigations, but beside this, from energetic point of view the process related evaluation has even higher importance. keywords: mechanical activation, grinding, power station fly ash, reactivity, energy efficiency.Gábor Mucsi Associate Professor and Deputy Dean at the university of miskolc, Faculty of earth science and engineering, institute of raw material Preparation and environmental Processing. His main fields in education and research are mechanical processes -comminution, especially fine grinding, mechanical activation -and utilization of industrial by-products and waste materials. He has more than 100 publications.

show abstract

The effect of grinding on the physical properties of fly ashes and a portland cement clinker

Cited by 90 publications

References 5 publications

Valorisation of Stainless Steel Slags as a Hydraulic Binder

Valorisation of Stainless Steel Slags as a Hydraulic Binder

Grey Connection Analysis between Cement Particle Size Distribution and Compressive Strength

Mechanical activation of power station fl y ash by grinding – A review

Contact Info

Product

Resources

About