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A Study on Tannery Sludge as a Raw Material for Cement Mortar

The paper analyses the properties (chemical and mineral composition, microstructure, density, etc.) of recycled tannery sludge (TS) and the possibilities for using it in cement mortar mixture. Mortar specimens containing 3–12% of tannery sludge by weight of cement and 3–9% of tannery sludge by weigh...

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Autores principales: Malaiškienė, Jurgita, Kizinievič, Olga, Kizinievič, Viktor
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2019
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6539026/
https://www.ncbi.nlm.nih.gov/pubmed/31086022
http://dx.doi.org/10.3390/ma12091562
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author Malaiškienė, Jurgita
Kizinievič, Olga
Kizinievič, Viktor
author_facet Malaiškienė, Jurgita
Kizinievič, Olga
Kizinievič, Viktor
author_sort Malaiškienė, Jurgita
collection PubMed
description The paper analyses the properties (chemical and mineral composition, microstructure, density, etc.) of recycled tannery sludge (TS) and the possibilities for using it in cement mortar mixture. Mortar specimens containing 3–12% of tannery sludge by weight of cement and 3–9% of tannery sludge by weight of sand were tested. Flowability, density, ultrasonic pulse velocity (UPV), flexural and compressive strength, water absorption and sorptivity of the mortar were analysed. X-ray diffraction (XRD) and scanning electron microscopy (SEM) analysis of tannery sludge and mortar are presented. The tests revealed that replacement of 6% of cement with tannery sludge in the mix increased flexural and compressive strength and UPV values, whereas water absorption decreased. SEM and XRD analysis revealed that specimens with tannery sludge contained lower amounts of ettringite and higher amounts of portlandite; the obtained structure was denser and contained more calcium hydrosilicates (C-S-H). Chromium leaching values in cement mortars were found not to exceed the limit values set forth in Directive 2003/33/EC.
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spelling pubmed-65390262019-06-05 A Study on Tannery Sludge as a Raw Material for Cement Mortar Malaiškienė, Jurgita Kizinievič, Olga Kizinievič, Viktor Materials (Basel) Article The paper analyses the properties (chemical and mineral composition, microstructure, density, etc.) of recycled tannery sludge (TS) and the possibilities for using it in cement mortar mixture. Mortar specimens containing 3–12% of tannery sludge by weight of cement and 3–9% of tannery sludge by weight of sand were tested. Flowability, density, ultrasonic pulse velocity (UPV), flexural and compressive strength, water absorption and sorptivity of the mortar were analysed. X-ray diffraction (XRD) and scanning electron microscopy (SEM) analysis of tannery sludge and mortar are presented. The tests revealed that replacement of 6% of cement with tannery sludge in the mix increased flexural and compressive strength and UPV values, whereas water absorption decreased. SEM and XRD analysis revealed that specimens with tannery sludge contained lower amounts of ettringite and higher amounts of portlandite; the obtained structure was denser and contained more calcium hydrosilicates (C-S-H). Chromium leaching values in cement mortars were found not to exceed the limit values set forth in Directive 2003/33/EC. MDPI 2019-05-13 /pmc/articles/PMC6539026/ /pubmed/31086022 http://dx.doi.org/10.3390/ma12091562 Text en © 2019 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Malaiškienė, Jurgita
Kizinievič, Olga
Kizinievič, Viktor
A Study on Tannery Sludge as a Raw Material for Cement Mortar
title A Study on Tannery Sludge as a Raw Material for Cement Mortar
title_full A Study on Tannery Sludge as a Raw Material for Cement Mortar
title_fullStr A Study on Tannery Sludge as a Raw Material for Cement Mortar
title_full_unstemmed A Study on Tannery Sludge as a Raw Material for Cement Mortar
title_short A Study on Tannery Sludge as a Raw Material for Cement Mortar
title_sort study on tannery sludge as a raw material for cement mortar
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6539026/
https://www.ncbi.nlm.nih.gov/pubmed/31086022
http://dx.doi.org/10.3390/ma12091562
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