Synergistic enhancement of converter steelmaking slag, blast furnace slag, Bayer red mud in cementitious materials: Strength, phase composition, and microstructure

Zhang, Wei; Hao, Xiansheng; Wei, Chao; Zeng, Qingsen; Ma, Shanliang; Liu, Xiaoming; Zhang, Zengqi; Webeck, Elizabeth

doi:10.1016/j.jobe.2022.105177

Cited by 17 publications

(4 citation statements)

References 28 publications

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“…In addition to this, the cementitious systems also contain residual RO phases (MgO, FeO, MnO) from the raw materials, Ca(OH) 2 and calcite from the carbonation reaction. It has been shown that a large portion of the hydration products of alkali-activated cementitious systems is amorphous gels, which do not have very distinct diffraction peaks in XRD spectra; instead, they exhibit widely diffuse peaks [26,27]. The diffuse peaks in CCR-GBFS-SS cementitious systems are mainly concentrated in 2θ = 25-35 • , and are mainly attributed to amorphous C-(A)-S-H gels.…”

Section: Hydration Products and Chemical Structure Of Cementitious Sy...mentioning

confidence: 99%

Study on the Properties and Hydration Mechanism of Calcium Carbide Residue-Based Low-Carbon Cementitious Materials

Wang,

et al. 2024

Buildings

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Alkali-activated cementitious materials, as an environmentally friendly cementitious material, can effectively reduce carbon emissions and improve the utilisation of solid wastes. However, traditional strong alkali activators have limitations such as high carbon emissions and poor safety. In order to overcome the defects of traditional strong alkaline activators and realise the high value-added use of calcium carbide residue (CCR), this paper adopts CCR as an alkaline activator to activate granulated blast furnace slag (GBFS)-steel slag (SS) cementitious systems for the preparation of alkaline-activated cementitious materials. The effects of CCR content and SS content on the compressive strength and working performance of CCR-GBFS-SS cementitious systems are analysed, along with the hydration process of CCR-GBFS-SS cementitious systems and the mechanism of action through the hydration products, their chemical structure and their microscopic morphology. The research results show that CCR-GBFS-SS cementitious systems have a 28-day compressive strength of 41.5 MPa and they can be controlled by the setting time; however, the flow performance is poor. The SS content can be increased to improve the flow performance; however, this will reduce the compressive strength. In CCR-GBFS-SS cementitious systems, CCR is the main driving force of hydration reactions, GBFS mainly provides active silica and aluminium and the amorphous C-(A)-S-H gel and ettringite formed by the synergistic action of multiple solid wastes are the main sources of compressive strength. With the extension of the curing time, the amount of hydration products in the cementitious systems gradually increases and the matrix of the cementitious systems gradually becomes denser. This study will provide a reference for the consumption of low-value solid waste such as CCR and the preparation of low-carbon cementitious materials from multi-component solid wastes.

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Section: Hydration Products and Chemical Structure Of Cementitious Sy...mentioning

confidence: 99%

Study on the Properties and Hydration Mechanism of Calcium Carbide Residue-Based Low-Carbon Cementitious Materials

Wang,

et al. 2024

Buildings

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“…The alkali in RM and sulfate in desulfurization gypsum can effectively activate the chemical reactivity of steel slag, and promote the generate of C-S-H gel and ettringite. Zhang et al [20] prepared a multi-solid waste cementitious material containing RM, converter steel slag and blast furnace slag. The study revealed that the optimal synergistic effect among the three solid waste materials occurred when the converter steel slag content is 30 wt%.…”

Section: Introductionmentioning

confidence: 99%

“…Nonetheless, there are certain differences in the chemical mineral composition of RM in different regions, so the activation conditions of RM may also be different. Moreover, the current studies mainly focused on low-iron and high-calcium RM and high-iron and low-calcium RM [13][14][15][16][17][18][19][20].…”

Section: Introductionmentioning

confidence: 99%

Analysis of Calcined Red Mud Properties and Related Mortar Performances

Lyu,

Li,

Fan

et al. 2024

FDMP

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Red mud (RM) is a low-activity industrial solid waste, and its utilization as a resource is currently a hot topic. In this study, the micro characteristics of red mud at different calcination temperatures were analyzed using X-ray diffraction and scanning electron microscopy. The performance of calcined red mud was determined through mortar strength tests. Results indicate that high-temperature calcination can change the mineral composition and microstructure of red mud, and increase the surface roughness and specific surface area. At the optimal temperature of 700°C, the addition of calcined red mud still leads to a decrease in mortar strength, but its activity index and flexural coefficient increase by 16.2% and 11.9% with respect to uncalcined red mud, reaching values of 0.826 and 0.974, respectively. Compared with the control group, the synergistic activation of calcined red mud with slag can increase the compressive and flexural strength of the mortar by 12.9% and 1.5%, reaching 8.7 and 62.4 MPa, respectively. Correspondingly, the activity index and flexural coefficient of the calcined RM and GGBS (Ground Granulated Blast furnace Slag) mixtures also increase to 1.015 and 1.130, respectively.

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“…The cementitious materials prepared by composite with SS can increase mortar's density, whereas the soluble alkali in RM and sulfate substances rich in EMR can be used to excite the activity of SS. A few scholars have discovered [5,7,8] that the activity of both composite excitations of SS is better than that of individual excitation. This method not only maximizes the applications of multiple solid waste resources to prepare cementitious materials but also consumes less energy, is less costly, more feasible, and better coordinated with cement.…”

Section: Introductionmentioning

confidence: 99%

Study on the Mechanical Properties and Hydration Behavior of Steel Slag–Red Mud–Electrolytic Manganese Residue Based Composite Mortar

Chen

et al. 2023

Applied Sciences

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The functional and mechanical properties of steel slag (SS)–red mud (RM)–electrolytic manganese residue (EMR)-based composite mortar under different matching ratio conditions were investigated in this paper to examine the synergistic cementing effect among multiple solid wastes. The hydration characteristics of the composite mortar and its microstructure were characterized by the heat of hydration assessment, X-ray diffraction, thermogravimetric analysis, and other tests. The results of the study showed that compared with the pure cement group, 30% SS alone will inhibit the hydration reaction of the slurry, thus reducing the mechanical properties of the mortar, while compounding the appropriate amount of RM, and EMR can effectively reduce the negative impact of SS on the mechanical properties of the mortar. The flexural and compressive strengths of the composite mortar at 28 d were the highest when 15% of SS, 12% of RM, and 3% of EMR were mixed, which were 7.2 MPa and 41.4 MPa at 28 d, respectively. Compared with the test group with 30% SS alone, the flexural and compressive strengths increased by 18.0% and 25.5%. This is mainly because the incorporation of RM and EMR not only plays the role of physical filling, but the free alkali in RM and sulfate material in EMR can also compoundly stimulate the hydration activity of SS to produce more calcium alumina (AFt) and hydrated calcium silicate (C–S–H gel), thus improving the microstructure of mortar, which makes the overall decrease of 26.35% of multiharmful and harmful pores and the overall increase of harmless and less harmful pores of composite mortar specimens of 43.57%.

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Synergistic enhancement of converter steelmaking slag, blast furnace slag, Bayer red mud in cementitious materials: Strength, phase composition, and microstructure

Cited by 17 publications

References 28 publications

Study on the Properties and Hydration Mechanism of Calcium Carbide Residue-Based Low-Carbon Cementitious Materials

Study on the Properties and Hydration Mechanism of Calcium Carbide Residue-Based Low-Carbon Cementitious Materials

Analysis of Calcined Red Mud Properties and Related Mortar Performances

Study on the Mechanical Properties and Hydration Behavior of Steel Slag–Red Mud–Electrolytic Manganese Residue Based Composite Mortar

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