El uso de glauconita gastada en la producción de agregados ligeros

Franus, Wojciech; Franus, Małgorzata; Latosińska, Jolanta; Wójcik, Rafał

doi:10.3989/cyv.252011

Cited by 17 publications

(8 citation statements)

References 13 publications

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“…Much effort has been recently invested to modify the LWAs’ structure using a variety of materials including different fly ashes, glass, sewage or industrial sludges, mining residues, polishing residues, used sorbents and/or contaminated soils [3,4,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27]. Some of these materials may contribute to the foaming or bloating of LWAs during sintering, thus increasing their porosity [28].…”

Section: Introductionmentioning

confidence: 99%

Modification of Lightweight Aggregates’ Microstructure by Used Motor Oil Addition

et al. 2016

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An admixture of lightweight aggregate substrates (beidellitic clay containing 10 wt % of natural clinoptilolite or Na-P1 zeolite) with used motor oil (1 wt %–8 wt %) caused marked changes in the aggregates’ microstructure, measured by a combination of mercury porosimetry (MIP), microtomography (MT), and scanning electron microscopy. Maximum porosity was produced at low (1%–2%) oil concentrations and it dropped at higher concentrations, opposite to the aggregates’ bulk density. Average pore radii, measured by MIP, decreased with an increasing oil concentration, whereas larger (MT) pore sizes tended to increase. Fractal dimension, derived from MIP data, changed similarly to the MIP pore radius, while that derived from MT remained unaltered. Solid phase density, measured by helium pycnometry, initially dropped slightly and then increased with the amount of oil added, which was most probably connected to changes in the formation of extremely small closed pores that were not available for He atoms.

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Section: Introductionmentioning

confidence: 99%

Modification of Lightweight Aggregates’ Microstructure by Used Motor Oil Addition

et al. 2016

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“…The Maximum Leaching (ML) method was applied to achieve the immobilization level of heavy metals from building materials [61,62]. It allowed determination of the maximal leaching of the substances from the tested materials in extreme conditions of the environment.…”

Section: Methodsmentioning

confidence: 99%

Mechanical and Physical Properties of Hydrophobized Lightweight Aggregate Concrete with Sewage Sludge

et al. 2016

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This article is focused on lightweight aggregate-concrete modified by municipal sewage sludge and lightweight aggregate-concrete obtained from light aggregates. The article presents laboratory examinations of material physical parameters. Water absorptivity of the examined material was decreased by the admixture of water emulsion of reactive polysiloxanes. Water transport properties were determined using Time Domain Reflectometry, an indirect technique for moisture detection in porous media. Together with basic physical parameters, the heat conductivity coefficient λ was determined for both types of lightweight aggregate-concrete. Analysis of moisture and heat properties of the examined materials confirmed the usefulness of light aggregates supplemented with sewage sludge for prospective production.

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“…The high K content of the clay mineral makes glaucony a beneficial source of K in soils and appealing as a soil conditioner for agricultural systems. Additionally, glaucony has been used in other applications including the removal of heavy metals from aqueous solutions, dating minerals and rocks, and to obtain lightweight aggregate [18][19][20].…”

Section: Introductionmentioning

confidence: 99%

Potassium and Metal Release Related to Glaucony Dissolution in Soils

et al. 2019

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Plant nutrients such as potassium (K) may be limited in soil systems and additions (i.e., fertilizer) are commonly required. Glaucony is a widely distributed and abundant marine-derived clay mineral present in soils worldwide which may serve as a source of potassium. The South Island of New Zealand contains numerous deposits of glaucony-rich rocks and related soils providing an opportunity to explore how glaucony might be a beneficial source of potassium. Here, the geochemistry of glaucony and its suitability as a mineral source of soil K from four deposits in New Zealand was examined using spatially resolved chemical analyses and dissolution experiments. Geochemical and morphological analyses revealed that glaucony from all deposits were K-enriched and were of the evolved (6%–8% K2O) to highly evolved type (>8% K2O). Glaucony derived from growth inside pellets contain elevated K and Fe concentrations compared to bioclast-hosted glaucony. Solubility analysis showed that K was released from glaucony at rates higher than any other metal present in the mineral. Additionally, decreasing the pH and introducing an oxidizing agent (i.e., birnessite which is ubiquitous in soil environments) appeared to accelerate K release. Trace metals including Cr, Zn, Cu, and Ni were present in the solid phase analysis; however, further investigation with a focus on Cr revealed that these elements were released into solution at low concentrations and may present a source of soil micronutrients. These results suggest that glaucony may offer a source of slow releasing K into soils, and so could be used as a locally sourced environmentally sustainable K resource for agriculture, whether in New Zealand or worldwide

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El uso de glauconita gastada en la producción de agregados ligeros

Cited by 17 publications

References 13 publications

Modification of Lightweight Aggregates’ Microstructure by Used Motor Oil Addition

Modification of Lightweight Aggregates’ Microstructure by Used Motor Oil Addition

Mechanical and Physical Properties of Hydrophobized Lightweight Aggregate Concrete with Sewage Sludge

Potassium and Metal Release Related to Glaucony Dissolution in Soils

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