Influence of dolomite on the properties and microstructure of alkali-activated slag with and without pulverized fly ash

Ye, Hailong; Fu, Chuanqing; Yang, Guojing

doi:10.1016/j.cemconcomp.2019.05.011

Cited by 64 publications

(20 citation statements)

References 44 publications

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“…With increasing replacement levels of LBD, a higher fluidity reduction effect appeared. The decrease in flow value is similar to the results reported in previous studies [41]. H. Ye et al indicated that the dolomite incorporation decreases the workability of AAS, thus, leading to increased water demands to achieve a similar flow value.…”

Section: Resultssupporting

confidence: 89%

“…Reactive CaO and MgO inside LBD, produced calcium hydroxide, C-A-S-H gel, and magnesium hydroxide, which affected the heat evolution of the AAS system. Ye et al [41] also reported that the replacement of slag with dolomite, increased the Na 2 O content and caused the slag to react at a more advanced level.…”

Section: Resultsmentioning

confidence: 99%

“…Hailong Ye et al [41] found that the incorporation of dolomite induced porosity reduction and strength development, by enhancing the reaction degree of slag because of a filler effect. Machner et al [47] showed similar enhancement of compressive strength results and attributed the compressive strength development to the use of dolomite through carbonate addition.…”

Section: Resultsmentioning

confidence: 99%

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Effects of Light-Burnt Dolomite Incorporation on the Setting, Strength, and Drying Shrinkage of One-Part Alkali-Activated Slag Cement

et al. 2019

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This study investigates the potential of light-burnt dolomite (LBD) as a supplementary cementitious material with ground granulated blast furnace slag (GGBFS) and Ordinary Portland cement (OPC). In this work, LBD was substituted for up to 20% of GGBFS in sodium sulfate-activated slag systems. The effects of LBD incorporation on the flow, setting time, compressive and flexural strength development, and drying shrinkage were explored with, X-ray diffraction and thermogravimetric analyses. LBD incorporation resulted in greater strength development of an alkali-activated slag system. The optimum LBD content for strength development was 10%, regardless of ordinary Portland cement content. In addition, LBD decreased the drying shrinkage, accelerated the hydration process, and induced hydrotalcite formation, which can be attributed to the reactive MgO inside LBD.

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Section: Resultssupporting

confidence: 89%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

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Effects of Light-Burnt Dolomite Incorporation on the Setting, Strength, and Drying Shrinkage of One-Part Alkali-Activated Slag Cement

et al. 2019

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“…The development of short-term strength is mainly associated with the reactions of blast furnace granulated slag, while the reactions of fly ash are manifested in longer-term strength [8]. Ye (2018) and Ye et al (2019) [9,10] state that in addition to the main hydration product in alkali-activated slags in the form of a C-(A)-S H gel, phases of the hydrotalcite type are also formed, regardless of the chemical composition and source of reactants. These phases are bilayer hydroxides based on Mg-Al.…”

mentioning

confidence: 99%

“…These phases are bilayer hydroxides based on Mg-Al. Hydrotalcite plays an important role especially in the chemical resistance of alkali-activated materials, such as chloride penetration resistance, resistance to carbon dioxide penetration and resistance to sulphates [9,10].…”

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confidence: 99%

Effect of Admixtures on Durability Characteristics of Fly Ash Alkali-activated Material

Procházka

Boháčová

2020

Emerg Sci J

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This paper deals with the possibility of partial replacement of blast furnace slag with fly ash and fly ash after denitrification by SNCR method in alkali-activated materials based on granulated blast furnace slag. The aim of this paper is to verify the effect of fly ash on properties of alkali-activated materials based on blast furnace granulated slag. Frost resistance and resistance to aggressive environments, represented by demineralized water were tested. The reference mixture was based on blast furnace granulated slag activated by sodium water glass with silicate modulus of 2. Mixtures with an ash content of 10, 20, and 30% were then compared with the reference mixture. The influence of the denitrification process on fly ash and its use in mixed alkali activated materials was also compared. As a part of the experiment, alkali-activated pastes were also prepared. Infrared spectroscopy with Furier transformation was subsequently determined on these pastes. The reference mixture achieved the highest compressive strength in the experiment and the strength decreased with increasing amount of fly ash. In terms of flexural strength, the highest values were reached for mixtures with 10% slag replacement by fly ash. In the case of frost resistance, the significant increase of flexural strength, which was 50% for the reference mixture, is particularly interesting. For compressive strength, the frost resistance coefficient ranged from 0.95 to 1.00. In the case of resistance to aggressive environments, no differences were observed in the compressive strength, on the other hand, flexural strength decrease of up to 20% was detected for 10 and 20 percent replacement of slag with fly ash that did not undergo denitrification. Monitored properties did not show any negative effect of the denitrification process on fly ash properties. Infrared spectroscopy identified the main hydration product in the region of 945 cm-1which is a C-(A)-S-H gel and in combined mixtures with fly ash also N-A-S-H gel. Doi: 10.28991/esj-2020-01247 Full Text: PDF

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Processing and characterization of waste dolomite dust filled hemp‐epoxy composites

Maurya,

Mahapatra,

Satapathy

2024

Materialwissenschaft Werkst

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The necessity to adapt sustainable development, green chemistry and industrial ecology leads to the creation of newer materials and the utilization of waste. In this context, this work aims at exploring the feasibility of the fabrication of hybrid composites comprised of a polymeric resin reinforced with a natural fiber (hemp) and an industry waste filler (dolomite dust). While the hemp fiber content is kept constant, epoxy‐based hybrid composites are fabricated with different weight percentages of dolomite dust using the conventional hand lay‐up route. The microstructural features of the constituent materials are studied using stereo and scanning electron microscopes which show the shape and size of dolomite particles and the arrangement of fibers. An x‐ray diffraction analysis revealed the presence of hematite, graphite, lime and manganite. The presence of functional groups like hydroxyl, carboxyl and azide is ascertained from the transmittance spectra of Fourier transform infrared spectroscopy. The density and void fractions are increasing with the amount of filler particles in the composite. It is observed that the tensile and flexural strengths of the composites marginally drop with increase in dolomite dust content, but there is a reasonable improvement in their inter‐laminar shear strength, micro‐hardness and impact strength values.

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Influence of dolomite on the properties and microstructure of alkali-activated slag with and without pulverized fly ash

Cited by 64 publications

References 44 publications

Effects of Light-Burnt Dolomite Incorporation on the Setting, Strength, and Drying Shrinkage of One-Part Alkali-Activated Slag Cement

Effects of Light-Burnt Dolomite Incorporation on the Setting, Strength, and Drying Shrinkage of One-Part Alkali-Activated Slag Cement

Effect of Admixtures on Durability Characteristics of Fly Ash Alkali-activated Material

Processing and characterization of waste dolomite dust filled hemp‐epoxy composites

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