Particle characteristics and hydration activity of ground granulated blast furnace slag powder containing industrial crude glycerol-based grinding aids

Zhao, Jihui; Wang, Dongmin; Yan, Peiyu; Zhao, Shijiao; Zhang, Dawang

doi:10.1016/j.conbuildmat.2015.12.043

Cited by 26 publications

(8 citation statements)

References 39 publications

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“…Pal et al [10] investigated the relationship between the hydraulic index (HI) of slag and the influencing factors of slag, including glass content, fineness, and chemical composition. Zhao et al [11] studied the particle characteristics and hydration activity of GGBFS containing industrial crude glycerol-based milling aids. e result indicated that means and milling aids strongly affect the activity of GGBFS.…”

Section: Introductionmentioning

confidence: 99%

Influences of Ultrafine Slag Slurry Prepared by Wet Ball Milling on the Properties of Concrete

Dai

et al. 2018

Advances in Materials Science and Engineering

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e application of ultrafine ground-granulated blast-furnace slag (GGBFS) in concrete becomes widely used for high performance and environmental sustainability. e form of ultrafine slag (UFS) used in concrete is powder for convenience of transport and store. Drying-grinding-drying processes are needed before the application for wet emission. is paper aims at exploring the performances of concrete blended with GGBFS in form of slurry. e ultrafine slag slurry (UFSS) was obtained by the process of grinding the original slag in a wet ball mill, which was mixed in concrete directly. e durations of grinding were 20 min, 40 min, and 60 min which were used to replace Portland cement with different percentages, namely, 20, 35, and 50, and were designed to compare cement with original slag concrete. e workability was investigated in terms of fluidity. Microstructure and pore structure were evaluated by X-ray diffraction (XRD), scanning electron microscopy (SEM), and mercury intrusion porosimetry (MIP). e fluidity of concrete mixed with UFSS is deteriorated slightly. e microstructure and early strength were obviously improved with the grind duration extended.

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Section: Introductionmentioning

confidence: 99%

Influences of Ultrafine Slag Slurry Prepared by Wet Ball Milling on the Properties of Concrete

Dai

et al. 2018

Advances in Materials Science and Engineering

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“…Generally, only after being ground into powder, could steel slag have hydration activity and be used as supplementary cementitious materials [9,10]. The smaller the particle size of steel slag powder, the higher its hydration activity [11,12]. However, the grindability of steel slag is much worse than that of other mineral admixtures such as fly ash and granulated blast-furnace slag, seriously impeding the preparation efficiency of steel slag powder and its application performance in building materials.…”

Section: Introductionmentioning

confidence: 99%

Comparison of Grinding Characteristics of Converter Steel Slag with and without Pretreatment and Grinding Aids

2016

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Abstract:The converter steel slag cannot be widely used in building materials for its poor grindability. In this paper, the grinding characteristics of untreated and pretreated (i.e., magnetic separation) steel slag were compared. Additionally, the grinding property of pretreated steel slag was also studied after adding grinding aids. The results show that the residues (i.e., oversize substance) that passed a 0.9 mm square-hole screen can be considered as the hardly grinding phases (HGP) and its proportion is about 1.5%. After the initial 20 min grinding, the RO phase (RO phase is a continuous solid solution which is composed of some divalent metal oxides, such as FeO, MgO, MnO, CaO, etc.), calcium ferrite, and metallic iron phase made up most of the proportion of the HGP, while the metallic iron made up the most component after 70 min grinding. The D50 of untreated steel slag could only reach 32.89 µm after 50 min grinding, but that of pretreated steel slag could reach 18.16 µm after the same grinding time. The grinding efficiency of steel slag was obviously increased and the particle characteristics were improved after using grinding aids (GA), especially the particle proportions of 3-32 µm were obviously increased by 7.24%, 7.22%, and 10.63% after 40 min, 50 min, and 60 min grinding, respectively. This is mainly because of the reduction of agglomeration and this effect of GA was evidenced by SEM (scanning electron microscope) images.

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“…The content of calcium ferrite and the RO phase in BOF slag is reduced in the process of high-temperature reconstruction. The content of the calcium ferrite phase and the RO phase in BOF slag decrease in the process of high temperature modification, and these two phases are also the most difficult to grind from the perspective of mineral hardness [12]. Therefore, the grindability of steel slag is improved after high-temperature reconstruction treatment due to the changes of these two factors.…”

Section: Reconstructionmentioning

confidence: 99%

“…At the same time, some studies show that the metal iron in steel slag is one of the main reasons for the poor grindability of steel slag [11]. However, in different milling stages, the factors affecting the milling efficiency usually vary with different milling characteristics [12].…”

Section: Introductionmentioning

confidence: 99%

Phases Reconstruction and Foaming Modification of Basic Oxygen Furnace Slag on Its Grindability

et al. 2021

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Basic oxygen furnace (BOF) slag is a main byproduct produced during the converter steelmaking process. The poor grindability of BOF slag limits its added-value application. In this paper, the grinding characteristics of unmodified and reconstructed BOF slag were compared. Additionally, the grinding property of reconstructed steel slag was also studied after SiC foaming. The results show that the solid solution of divalent metal oxides’ RO phase, considered as the hardly grinding phase, discomposes after lime-bauxite reconstruction. The characteristics of BOF slag were tested through particle size analysis, XRD, SEM and MIP. The SSA (specific suface area) and the particle diameter of unmodified BOF slag could reach 303.1 m2/kg and 51.75 µm after 10 min of grinding, but that of reconstructed BOF slag could reach 354.5 m2/kg and 18.16 µm after the same grinding time, respectively. The grinding efficiency of steel slag was obviously increased and the particle characteristics were improved after foaming modification. BOF formed as a porous structure after SiC foaming; its porosity, SSA, and particle diameter can reach 31.79%, 424.4 m2/kg, and 24.36 μm and increased by 10.31%, 19.72%, and 39.04%, compared with the reconstructed steel slag of undoped foaming agent, respectively, and the grindability was further improved. A theoretical basis for large-scale BOF slag utilization is provided.

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Particle characteristics and hydration activity of ground granulated blast furnace slag powder containing industrial crude glycerol-based grinding aids

Cited by 26 publications

References 39 publications

Influences of Ultrafine Slag Slurry Prepared by Wet Ball Milling on the Properties of Concrete

Influences of Ultrafine Slag Slurry Prepared by Wet Ball Milling on the Properties of Concrete

Comparison of Grinding Characteristics of Converter Steel Slag with and without Pretreatment and Grinding Aids

Phases Reconstruction and Foaming Modification of Basic Oxygen Furnace Slag on Its Grindability

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