Preparation, characterization, and application of an eco-friendly sand-fixing material largely utilizing coal-based solid waste

Peng, Dandan; Wang, Yaguang; Liu, Xiaoming; Tang, Binwen; Zhang, Na

doi:10.1016/j.jhazmat.2019.03.092

Cited by 44 publications

(14 citation statements)

References 45 publications

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“…Table 10 shows that the hazardous metals Na, Cr, and Pb comply with the standard requirements. According to the previous research results [ 19 , 20 , 21 , 22 ], C-S-H gel, C-A-S-H gel, and ettringite produced in cementitious materials can effectively solidify Na and heavy metal ions. It can be seen from Table 10 that the heavy metal ions were not detected in the cementitious materials at 28 d, and the leaching concentration of Na in BRM-cement, CBRM-cement, and Tailings-cement is 47.261, 28.543, and 10.397 mg/L, respectively, which indicates that more active silicon and aluminum in Tailings are involved in the hydration reaction of cementitious materials, and the gel and ettringite can effectively solidify Na and heavy metal ions.…”

Section: Resultsmentioning

confidence: 97%

“…However, the intensity of the peak is different due to the different extent of hydration reaction. Ca(OH) 2 is formed by the reaction of CaO with H 2 O, which can generate a pozzolanic reaction with the active SiO 2 and Al 2 O 3 in cementitious materials, and lead to the formation of gel and ettringite [ 19 ]. Therefore, compared to BRM-cement, the CBRM-cement and Tailings-cement get better activation and produce more active SiO 2 and Al 2 O 3 and with stronger pozzolanic reactivity.…”

Section: Resultsmentioning

confidence: 99%

“…Figure 9 shows the FTIR absorption spectra of BRM-cement, CBRM-cement, and Tailings-cement at 28 d. The absorption peak in the range of 800–1200 cm −1 is asymmetric tensile vibration of Si-O-Si or Si-O-Al connected with tetrahedron of [SiO 4 ] or [AlO 4 ] − . The bending vibration at 3440 cm −1 is an Al-OH chemical bond, which represents [Al(OH) 6 ] 3− structures of the octahedra of ettringite [ 19 ], and the absorption spectrum of Tailings-cement is the widest. The weak absorption peaks at 1643 cm −1 indicate the vibration spectrum of H-O-H.…”

Section: Resultsmentioning

confidence: 99%

“…The MIP results are shown in Table 5 . It is generally believed that in cementitious materials, the pores that are larger than 1 um are harmful, and cementitious materials with fewer harmful pores have higher mechanical properties [ 18 , 19 , 20 , 21 , 22 ]. It is obvious that the Tailings-cement owns fewer harmful pores, and the CBRM-cement takes the second place.…”

Section: Resultsmentioning

confidence: 99%

See 3 more Smart Citations

Tailings after Iron Extraction in Bayer Red Mud by Biomass Reduction: Pozzolanic Activity and Hydration Characteristics

Wang

Liu

et al. 2021

Materials

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Bayer red mud (BRM) is a kind of solid waste with high hematite content, and its effective utilization is difficult due to the special physicochemical properties. In this work, Fe2O3 in BRM was reduced to Fe3O4 by biomass, and iron concentrate and high activity tailings were obtained after magnetic separation. The pozzolanic activity and hydration characteristics of the tailings were systematically studied. The results showed that the relatively stable polymerization structures of Si-O and Al-O in BRM are destroyed under the effect of biomass reduction at 650 °C, and some fracture bonds and activation points are formed in the structures. The aluminosilicate phases in the BRM were easy to transform into the active substances of Si and Al. The pozzolanic activity of tailings is greatly improved, and its pozzolanic activity index is 91%. High polymerization degree of gel and ettringite are formed since more active substances and alkali in the tailings promote the hydration reaction of cement-based cementitious materials, which made cementitious materials have dense matrix, good mechanical properties, and environmental performance. This work has realized the full quantitative utilization of BRM and provided a feasible way for the resource utilization of BRM.

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Section: Resultsmentioning

confidence: 97%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

See 2 more Smart Citations

Tailings after Iron Extraction in Bayer Red Mud by Biomass Reduction: Pozzolanic Activity and Hydration Characteristics

Wang

Liu

et al. 2021

Materials

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“…The green sustainable development of cement has been a concern of international scholars, and research focus has mainly been on energy conservation, emission reduction and environmental protection, in order to meet the needs of carbon neutrality. Industrial solid wastes, such as fly ash, and blast furnace and steel slag, have been widely used as supplementary cementitious materials in the field of cement and concrete [ 4 , 5 , 6 ].…”

Section: Introductionmentioning

confidence: 99%

Rapid Evaluation of the Pozzolanic Activity of Bayer Red Mud by a Polymerization Degree Method: Correlations with Alkali Dissolution of (Si+Al) and Strength

et al. 2021

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A large amount of Bayer process red mud is discharged in the process of alumina production, which has caused significant pollution in the environment. The pozzolanic activity of Bayer red mud as a supplementary cementitious material is a research hotspot. In this work, a new method for Fourier-transform infrared spectrometry is used to determine the polymerization degree of Bayer red mud in order to evaluate its pozzolanic activity. Based on the results of the dissolution concentration of (Si+Al), strength index and polymerization degree of Bayer red mud, the relationships between different evaluation methods were analyzed, and the relevant calculation formulas of pozzolanic activity were obtained. The results showed that different evaluation methods can reflect the variation law of pozzolanic activity in Bayer red mud. The polymerization degree of Bayer red mud had a good linear relationship with the pozzolanic activity index obtained by the strength index and dissolution concentration of (Si+Al), respectively. The polymerization degree was negatively correlated with pozzolanic activity index and dissolution concentration of (Si+Al), and the correlation coefficients were greater than 0.85. Therefore, this method was found to be effective and hence can be used as a rapid and simple test for pozzolanic activity evaluation of Bayer red mud.

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Versatile Quasi‐Solid Ionic Conductive Elastomer Inspired by Desertification Control Strategy for Soft Iontronics

Zhou

Jin

Zeng

et al. 2023

Adv Funct Materials

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Ionic conductors, such as hydrogels, ionogels, and eutectogels, have attained considerable research interest in various advanced application scenarios. However, such ionic conductors still suffer from the restriction of inherent liquid compositions, which may leak or evaporate. Herein, inspired by the control strategy of desertification caused by soil erosion, a novel internal‐external dual enhancement design strategy, i.e., increasing the interaction between the filler itself and its matrix, is proposed to firmly embed the deep eutectic solvent (DES) into polyurethane (PU) to prevent liquid leakage, such that the prepared ionic conductive elastomers (PU‐DESs) are quasi‐solid. The PU‐DESs exhibit marvelous versatility including high stretchability, tensile strength, toughness, self‐healing efficiency, antibacterial ability, ionic conductivity, and excellent freezing tolerance. More intriguingly, benefiting from their quasi‐solid feature, PU‐DESs are endowed with long‐term environmental stability. Thanks to these superb versatile features, PU‐DESs are further successfully applied in the wearable sensor and triboelectric nanogenerator (TENG) for monitoring human motions and converting mechanical energy into electrical energy, breaking away from the limitations of previous most soft iontronics such as liquid leakage or evaporation and weak mechanical strength. Hence, this study establishes an effective material design strategy for various soft iontronics demanding environmental stability and durability.

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Preparation, characterization, and application of an eco-friendly sand-fixing material largely utilizing coal-based solid waste

Cited by 44 publications

References 45 publications

Tailings after Iron Extraction in Bayer Red Mud by Biomass Reduction: Pozzolanic Activity and Hydration Characteristics

Tailings after Iron Extraction in Bayer Red Mud by Biomass Reduction: Pozzolanic Activity and Hydration Characteristics

Rapid Evaluation of the Pozzolanic Activity of Bayer Red Mud by a Polymerization Degree Method: Correlations with Alkali Dissolution of (Si+Al) and Strength

Versatile Quasi‐Solid Ionic Conductive Elastomer Inspired by Desertification Control Strategy for Soft Iontronics

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