Evaluation of reactive Si and Al amounts in various geopolymer precursors by a simple method

Buruberri, L.H.; Tobaldi, David Maria; Caetano, Ana P.F.; Seabra, M.P.; Labrincha, J.A.

doi:10.1016/j.jobe.2018.11.017

Cited by 25 publications

(5 citation statements)

References 41 publications

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“…In 2017, a study revealed that waste rock wool is an ideal replacement for slag and fly ash from iron and metal to produce geopolymer concrete due to its high silicon and aluminum content [ 34 ]. This finding was confirmed using the selective solubility tests at pH 11.6 [ 84 , 85 ], which revealed that the selective solubility of milled waste rock wool (SiO 2 —73.0%, Al 2 O 3 —87.3%) was almost twice higher than fly ash’s (SiO 2 —32.9.0%, Al 2 O 3 —35.8%) [ 34 ].…”

Section: Repurposing As Fillers In Compositesmentioning

confidence: 79%

Waste Mineral Wool and Its Opportunities—A Review

et al. 2021

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Massive waste rock wool was generated globally and it caused substantial environmental issues such as landfill and leaching. However, reviews on the recyclability of waste rock wool are scarce. Therefore, this study presents an in-depth review of the characterization and potential usability of waste rock wool. Waste rock wool can be characterized based on its physical properties, chemical composition, and types of contaminants. The review showed that waste rock wool from the manufacturing process is more workable to be recycled for further application than the post-consumer due to its high purity. It also revealed that the pre-treatment method—comminution is vital for achieving mixture homogeneity and enhancing the properties of recycled products. The potential application of waste rock wool is reviewed with key results emphasized to demonstrate the practicality and commercial viability of each option. With a high content of chemically inert compounds such as silicon dioxide (SiO2), calcium oxide (CaO), and aluminum oxide (Al2O3) that improve fire resistance properties, waste rock wool is mainly repurposed as fillers in composite material for construction and building materials. Furthermore, waste rock wool is potentially utilized as an oil, water pollutant, and gas absorbent. To sum up, waste rock wool could be feasibly recycled as a composite material enhancer and utilized as an absorbent for a greener environment.

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Section: Repurposing As Fillers In Compositesmentioning

confidence: 79%

Waste Mineral Wool and Its Opportunities—A Review

et al. 2021

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“…Most of the particles fall within the range of 1–20 µm. The finer particles produced after ball milling of the OBA could increase its reactivity in alkaline medium and thus alters the geopolymerisation reactions [17,18]. It has been also reported that rapid geopolymer condensation occurs at room temperature when the median the particle sizes is less than 10 µm [19].…”

Section: Resultsmentioning

confidence: 99%

Olive biomass ash-based geopolymer composite: development and characterisation

Jaradat

Matalkah

2020

Advances in Applied Ceramics

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Alternative fuels are being used increasingly to reduce energy costs and benefit the economics of electric power industries. Olive residues could be among those alternative fuels. This paper investigates the potential use of olive biomass ash (OBA) to develop a new sustainable binder (geopolymer composite). Refined binder chemistry was developed where the alkali and silica contents of the OBA are supplemented by calcined kaolin (CK) as alumina-rich constituents targeting balanced chemistry. The results showed that optimum formulation was achieved when 40 wt-% OBA and 60 wt-% CK were blended yielding geopolymer concrete with 28day compressive strength of 30 MPa. Further refinements were carried out by adding of CaO or NaOH. The compressive strength reached to more than 45 MPa when 5 wt-% CaO or 10 wt-% NaOH was added to the optimum blend. microstructural and mineralogical studies were performed to get insight into the microstructural changes and explain the findings.

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“…Eriochrome cyanine R as a chromogenic agent of aluminum, has stability and selectivity, and can form a red-blue complex with aluminum under neutral conditions [ 95 ], so the root tips of 1–2 cm cut and treated for different times are cleaned with pure water for 0.5 h, then stained with 0.1% Eriochrome cyanine R solution for 0.5 h, and finally washed with pure water for 0.5 h, observed and photographed under a microscope (XSp-36-1600X-LED, Phoenix, China).…”

Section: Methodsmentioning

confidence: 99%

Physiological, Biochemical, and Transcriptomic Responses of Neolamarckia cadamba to Aluminum Stress

Dai

Chen

Liu

et al. 2020

IJMS

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Aluminum is the most abundant metal of the Earth’s crust accounting for 7% of its mass, and release of toxic Al3+ in acid soils restricts plant growth. Neolamarckia cadamba, a fast-growing tree, only grows in tropical regions with acidic soils. In this study, N. cadamba was treated with high concentrations of aluminum under acidic condition (pH 4.5) to study its physiological, biochemical, and molecular response mechanisms against high aluminum stress. High aluminum concentration resulted in significant inhibition of root growth with time in N. cadamba. The concentration of Al3+ ions in the root tip increased significantly and the distribution of absorbed Al3+ was observed in the root tip after Al stress. Meanwhile, the concentration of Ca, Mg, Mn, and Fe was significantly decreased, but P concentration increased. Aluminum stress increased activities of antioxidant enzymes such as superoxide dismutase (SOD), catalase from micrococcus lysodeiktic (CAT), and peroxidase (POD) in the root tip, while the content of MDA was decreased. Transcriptome analysis showed 37,478 differential expression genes (DEGs) and 4096 GOs terms significantly associated with treatments. The expression of genes regulating aluminum transport and abscisic acid synthesis was significantly upregulated; however, the genes involved in auxin synthesis were downregulated. Of note, the transcripts of several key enzymes affecting lignin monomer synthesis in phenylalanine pathway were upregulated. Our results shed light on the physiological and molecular mechanisms of aluminum stress tolerance in N. cadamba.

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Evaluation of reactive Si and Al amounts in various geopolymer precursors by a simple method

Cited by 25 publications

References 41 publications

Waste Mineral Wool and Its Opportunities—A Review

Waste Mineral Wool and Its Opportunities—A Review

Olive biomass ash-based geopolymer composite: development and characterisation

Physiological, Biochemical, and Transcriptomic Responses of Neolamarckia cadamba to Aluminum Stress

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