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353 results on '"Barbieri, Luisa"'

12. Chemical resistance in acidic environments of alkali-activated lightweight composites based on secondary raw materials.

Author

Lancellotti, Isabella, Dal Poggetto, Giovanni, Barbieri, Luisa, Nguyen, Hoang, and Leonelli, Cristina

Subjects
BASIC oxygen furnaces, CHEMICAL resistance, COMPRESSIVE strength, ACID throwing, PORTLAND cement, KAOLIN
Abstract

The durability problems in Portland cement are related to decalcification of C–S–H; alkali-activated composites are proposed as alternative, focusing on acid exposure and resistance. They were prepared from recycled materials, basic oxygen furnace carbonated and desulfurization slags. The standard material is 100% metakaolin geopolymer compared to slag-based alkali-activated materials (AAMs) with and without reinforcement of fibers (basalt, and cellulose), added in 4 wt%. The acidic environments are H2SO4, HCl, and HNO3N = 2.14 (10, 7.5, and 12.5 wt%, respectively). The chemical resistance is improved by the addition of basalt fibers. The decrease in weight loss is 48% in HNO3 and 47% in HCl for AAM-Bas sample, while for AAM-Cell it is 9% in HCl and 34% in HNO3. The compressive strength of the AAM and AAM-Bas samples remains constant after HCl attack, while this acid attacks cellulose samples, which are stable in HNO3 and have a compressive strength of 10 MPa. [ABSTRACT FROM AUTHOR]

Published
2024
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21. Sustainable glasses in the SiO2–P2O5–CaO–K2O system from waste and concentrated solar power Vidrios sostenibles en el sistema SiO2-P2O5-CaO-K2O a partir de residuos y radiación solar concentrada

Author

Romero, Maximina, Padilla, Isabel, Barbieri, Luisa, Andreola, Fernanda, López-Delgado, Aurora, Romero, Maximina, Padilla, Isabel, Barbieri, Luisa, Andreola, Fernanda, and López-Delgado, Aurora

Abstract

Sustainable glasses were prepared by green technology including the use of different wastes as raw materials and concentrated solar power (CSP) as renewable energy. The raw materials used to formulate the glasses were animal bone flour ash, which presents high contents of CaO, PO and alkaline oxides; glassy sand from the waste of packaging glass submitted to a primary treatment, composed principally of SiO; and potassium carbonate of reagent grade. Different exposure times to solar radiation were tested. For comparison, the same composition of glass was melted into a conventional electric furnace. The use of CSP to produce glasses reduces the melting time by approximately 90%, with consequent energy savings. The increased CSP processing time results in more amorphous and thermally stable glasses. The results showed the viability of producing ecofriendly glasses in the SiO–PO–CaO–KO system, which could be used as matrix-based fertilizers.

Published
2023

27. Effect of the chemical composition of different types of recycled glass used as aggregates on the ASR performance of cement mortars

Author

Saccani, Andrea, Bignozzi, Maria Chiara, Barbieri, Luisa, Lancellotti, Isabella, and Bursi, Elena

Subjects
Aggregates (Building materials) -- Analysis -- Chemical properties, Mortar -- Analysis -- Chemical properties, Cements (Building materials) -- Analysis -- Mechanical properties, Business, Construction and materials industries
Abstract

ABSTRACT Glass with different chemical compositions, deriving from separate collection, has been used as fine aggregate to formulate cementitious mortars, substituting natural sand. Glass coming from cathode-ray tube monitors, fluorescent [...]

Published
2017
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42. Preliminary Study on Sustainable NPK Slow-Release Fertilizers Based on Byproducts and Leftovers: A Design-of-Experiment Approach

Author

Barbi, Silvia, Barbieri, Francesco, Andreola, Fernanda, Lancellotti, Isabella, Barbieri, Luisa, and Montorsi, Monia

Subjects
Chemistry, QD1-999, Article
Abstract

In this study, an organic nitrogen-based coating was developed based on black soldier fly (BSF) prepupae reared on poultry dejections and deposited on ceramic lightweight aggregates (LWAs), containing phosphorous (P) and potassium (K) from agroresidues, leading to a complete nitrogen, phosphorus, and potassium (NPK) fertilizer. To obtain a resistant coating with good adhesion to LWAs, different plasticizing agents were tested (e.g., glycerol, cellulose, and polyethylene glycol). The coating formulation was optimized through a design-of-experiment (DoE) approach to correlate the effect of each mixture component on the coating's performance. BSF biomass was characterized through chemical and thermal routes, as well as the final coated LWAs, confirming their general agreement to fertilizer's requirements. Release tests in static conditions highlighted the barrier action of the coating, preventing uncontrolled release of potassium and phosphorus contained in the LWAs as well as the release of nitrogen after 21 days (near to 20%). Germination and growth tests indicated a valuable increase of the growth index, whereas the germination process is limited by the coating barrier effect. This work proposes a new product in the field of slow-release fertilizers designed by rational methodologies and innovative materials based on waste valorization, fully in agreement with a circular economy perspective.

Published
2020

49. Antibacterial properties and cytotoxicity of 100% waste derived alkali activated materials

Author

Sgarlata, Caterina, Dal Poggetto, Giovanni, Piccolo, Federica, Catauro, Michelina, Traven, Katja, kemičarka, Češnovar, Mark, Nguyen, Hoang, Yliniemi, Juho, Barbieri, Luisa, Ducman, Vilma, Lancellotti, Isabella, and Leonelli, Cristina

Subjects
social acceptance, antibacterial properties, cytotoxicity, alkali-activated materials, slag, stone wool, waste utilization, social acceptance, stone wool, antibakterijske lastnosti, citotoksičnost, alkalijsko aktivirani materiali, žlindra, kamena volna, izkoriščanje odpadkov, družbeno sprejemanje, slag, žlindra, izkoriščanje odpadkov, udc:620.1/.2, družbeno sprejemanje, cytotoxicity, alkalijsko aktivirani materiali, citotoksičnost, waste utilization, alkali-activated materials, kamena volna, antibacterial properties, antibakterijske lastnosti
Abstract

In this study we compare the leaching behavior and the antibacterial and cytotoxic properties of 100% slag or stone wool derived alkali activated materials. The antibacterial activity was measured as the inhibiting capacity against two Gram- negative bacterial strains, Escherichia coli and Pseudomonas aeruginosa and one Gram-positive bacterial strain: Enterococcus faecalis. The cytotoxicity properties were tested on mouse embryonic fibroblast NIH-3T3 cell-line. It was proved that the high quality of the 3D aluminosilicate network of the consolidated materials obtained from powders of CaO or MgO-rich slags or stone wool, opportunely activated with NaO and/or Na-silicate, was capable of stabilizing heavy metal cations. The concentrations of leachate heavy cations were lower than the European law limit when tested in water. The effect of additives in the composites, basal fibers or nanocellulose, did not reduce the chemical stability and slightly influenced the compressive strength. Weight loss in water increased by 20% with basalt fibers addition, while it remained almost constant when nanocellulose was added. All the consolidated materials, cement-like in appearance, exhibited limited antibacterial properties (viability from 50 to 80% depending on the bacterial colony and the amount of sample) and absence of cytotoxicity, envisaging good acceptance from part of the final consumer and zero ecological impact. CaO-rich formulations can replace ordinary Portland cement (showing bacterial viability at 100%) with a certain capability for preventing the reproduction of the E. coli and S. aureus bacteria with health and environmental protection results.

Published
2021

50. Influence of fine aggregates on the microstructure, porosity and chemico-mechanical stability of inorganic polymer concretes

Author

Kamseu, Elie, Ponzoni, Chiara, Tippayasam, Chayanee, Taurino, Rosa, Chaysuwan, Duangrudee, Bignozzi, Maria Chiara, Barbieri, Luisa, and Leonelli, Cristina

Subjects
Concrete -- Analysis -- Mechanical properties, Building materials -- Service life, Porosity -- Analysis, Business, Construction and materials industries
Abstract

ABSTRACT This work investigates the effects of the structure, the bulk chemical composition and amount of the aluminosilicate fines on the strength development, pore refinement, water permeability, moisture control capacity [...]

Published
2015
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