Preliminary investigation on the pozzolanic activity of superfine steel slag

Shi, Yan; Chen, Haiyan; Wang, Jia; Feng, Qiming

doi:10.1016/j.conbuildmat.2015.02.062

Cited by 68 publications

(22 citation statements)

References 20 publications

(21 reference statements)

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“…For 50%, the ratios of 7 and 28 days strength of original slag, UFSS20, UFSS40, and UFSS60 were found to be 63.7%, 65.7%, 69.3%, and 74.2%, respectively. e above results confirmed the trend obtained in dry ground slag by Yan Shi and Arash Aghaeipour [19,20]. e reasons for the above results may be the disparity of activity and particle size of slag.…”

Section: Compressive Strengthsupporting

confidence: 79%

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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: Compressive Strengthsupporting

confidence: 79%

“…However, slag exhibits a pozzolanic reaction in the presence of calcium hydroxide (Ca(OH) 2 ) formed upon cement hydration [20]. e extent of slag involved in the reaction could be reflected by the amount of calcium hydroxide under same content conditions.…”

Section: Microstructure Testsmentioning

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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“…%), a sufficient amount of hydrates like calcium silicate hydrate (C-S-H) gels could not be produced, resulting in the lower compressive strength. Shi et al [6] investigated the properties of a cement mortar with a superfine steel slag (D 50 = 5.3 μm) and found that the compressive strength of the cement mortar continuously decreased when the replacement weight ratio of the superfine SS was above 10 %.…”

Section: The Compressive Strengthmentioning

confidence: 99%

“…However, this direct improper disposal without any utilisation results in many problems in terms of disposal costs, land occupation and environmental contamination. Because of its certain cementitious properties [6,7], SS has gradually become an alternative additive to partially replace cement in paste, and mortar and concrete in construction applications. It is also often used as a fine or coarse aggregate in concrete production [8][9][10][11][12][13][14].…”

Section: Introductionmentioning

confidence: 99%

The Influence of Steel Slag With Variable Particle Size Distribution on the Workability and Mechanical Properties of Concrete

Zang¹

2018

Ceramics - Silikaty

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The present research investigated the influence of steel slag (SS) with variable particle size on the workability and mechanical properties of concrete. Different SS size ranges (0-15 μm, 15-30 μm, 30-45 μm and 45-80 μm) were obtained by sieving and then were characterised by a laser particle size analyser and a scanning electron microscope (SEM). The slump, compressive strength, pore structures and thermal analysis were used to evaluate the effect of the SS particle size on cement and concrete properties. The experimental results showed that finer SS (0-15 μm and 15-30 μm) resulted in negative effects on the workability, while 30-45 μm and 45-80 μm SS particles presented completely opposite results. Both of these effects were more apparent as the steel slag replacement ratio was increased up to 30 wt. %. Concrete samples with 0-15 μm and 45-80 μm SS particles presented comparable 7-and 28-day compressive strength to the control concrete when their replacement ratios were less than 10 wt. %. Moreover, the concrete samples with 45-80 μm SS particles at 5 % dosage developed the highest compressive strengths at 7 and 28 days, which were 2 % and 5 % higher than the control sample, respectively. The pore structure results indicated that a composition of 5 % 45-80 μm SS particles was advantageous for refining the pore structures of cement paste, further contributing to the 28-day compressive strength development of concrete.

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Preliminary investigation on the pozzolanic activity of superfine steel slag

Cited by 68 publications

References 20 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

The Influence of Steel Slag With Variable Particle Size Distribution on the Workability and Mechanical Properties of Concrete

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