Performance of Concrete Mixes Containing TBM Muck as Partial Coarse Aggregate Replacements

This study investigated the potential utilization of the TBM muck obtained from the Gold Line of the Doha Metro Project as a partial replacement of coarse aggregates in concrete mixes. First, the TBM muck particles were screened to coarse aggregate standard sizes. Then, concrete mixes were prepared...

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Autores principales:	Ala Abu Taqa, Mohamed Al-Ansari, Ramzi Taha, Ahmed Senouci, Ghaleb M. Al-Zubi, Mohamed O. Mohsen
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	TBM muck coarse aggregates recycling sustainability compressive strength flexural strength Technology T Electrical engineering. Electronics. Nuclear engineering TK1-9971 Engineering (General). Civil engineering (General) TA1-2040 Microscopy QH201-278.5 Descriptive and experimental mechanics QC120-168.85
Acceso en línea:	https://doaj.org/article/b3d7d4d9f8bc43e5ac00ac9055431288
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spelling	oai:doaj.org-article:b3d7d4d9f8bc43e5ac00ac90554312882021-11-11T17:50:42ZPerformance of Concrete Mixes Containing TBM Muck as Partial Coarse Aggregate Replacements10.3390/ma142162631996-1944https://doaj.org/article/b3d7d4d9f8bc43e5ac00ac90554312882021-10-01T00:00:00Zhttps://www.mdpi.com/1996-1944/14/21/6263https://doaj.org/toc/1996-1944This study investigated the potential utilization of the TBM muck obtained from the Gold Line of the Doha Metro Project as a partial replacement of coarse aggregates in concrete mixes. First, the TBM muck particles were screened to coarse aggregate standard sizes. Then, concrete mixes were prepared using 0%, 25%, 50%, and 75% TBM muck replacement of coarse aggregates. The compressive and flexural strengths were determined for all mixes at 28 and 56 days. Moreover, the results obtained were validated using EDX analysis and SEM images. A <i>t</i>-statistical analysis did not show a significant impact of TBM muck usage on the compressive strength results of the concrete mixes. However, another <i>t</i>-statistical analysis showed that TBM muck replacement of coarse aggregates had adversely affected the flexural strength results. The EDX analysis indicated the presence of Na<sup>+</sup> ions, which can replace the Ca<sup>2+</sup> ions in the C-S-H gel, cause discontinuities of it, and hence reduce the strength at later ages. Finally, the SEM images showed that the ettringite and carbon hydroxide (C-H) contents in the mixes with TBM muck were higher than that of the control mix, while the C-S-H gel was less in such mixes.Ala Abu TaqaMohamed Al-AnsariRamzi TahaAhmed SenouciGhaleb M. Al-ZubiMohamed O. MohsenMDPI AGarticleTBM muckcoarse aggregatesrecyclingsustainabilitycompressive strengthflexural strengthTechnologyTElectrical engineering. Electronics. Nuclear engineeringTK1-9971Engineering (General). Civil engineering (General)TA1-2040MicroscopyQH201-278.5Descriptive and experimental mechanicsQC120-168.85ENMaterials, Vol 14, Iss 6263, p 6263 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	TBM muck coarse aggregates recycling sustainability compressive strength flexural strength Technology T Electrical engineering. Electronics. Nuclear engineering TK1-9971 Engineering (General). Civil engineering (General) TA1-2040 Microscopy QH201-278.5 Descriptive and experimental mechanics QC120-168.85
spellingShingle	TBM muck coarse aggregates recycling sustainability compressive strength flexural strength Technology T Electrical engineering. Electronics. Nuclear engineering TK1-9971 Engineering (General). Civil engineering (General) TA1-2040 Microscopy QH201-278.5 Descriptive and experimental mechanics QC120-168.85 Ala Abu Taqa Mohamed Al-Ansari Ramzi Taha Ahmed Senouci Ghaleb M. Al-Zubi Mohamed O. Mohsen Performance of Concrete Mixes Containing TBM Muck as Partial Coarse Aggregate Replacements
description	This study investigated the potential utilization of the TBM muck obtained from the Gold Line of the Doha Metro Project as a partial replacement of coarse aggregates in concrete mixes. First, the TBM muck particles were screened to coarse aggregate standard sizes. Then, concrete mixes were prepared using 0%, 25%, 50%, and 75% TBM muck replacement of coarse aggregates. The compressive and flexural strengths were determined for all mixes at 28 and 56 days. Moreover, the results obtained were validated using EDX analysis and SEM images. A <i>t</i>-statistical analysis did not show a significant impact of TBM muck usage on the compressive strength results of the concrete mixes. However, another <i>t</i>-statistical analysis showed that TBM muck replacement of coarse aggregates had adversely affected the flexural strength results. The EDX analysis indicated the presence of Na<sup>+</sup> ions, which can replace the Ca<sup>2+</sup> ions in the C-S-H gel, cause discontinuities of it, and hence reduce the strength at later ages. Finally, the SEM images showed that the ettringite and carbon hydroxide (C-H) contents in the mixes with TBM muck were higher than that of the control mix, while the C-S-H gel was less in such mixes.
format	article
author	Ala Abu Taqa Mohamed Al-Ansari Ramzi Taha Ahmed Senouci Ghaleb M. Al-Zubi Mohamed O. Mohsen
author_facet	Ala Abu Taqa Mohamed Al-Ansari Ramzi Taha Ahmed Senouci Ghaleb M. Al-Zubi Mohamed O. Mohsen
author_sort	Ala Abu Taqa
title	Performance of Concrete Mixes Containing TBM Muck as Partial Coarse Aggregate Replacements
title_short	Performance of Concrete Mixes Containing TBM Muck as Partial Coarse Aggregate Replacements
title_full	Performance of Concrete Mixes Containing TBM Muck as Partial Coarse Aggregate Replacements
title_fullStr	Performance of Concrete Mixes Containing TBM Muck as Partial Coarse Aggregate Replacements
title_full_unstemmed	Performance of Concrete Mixes Containing TBM Muck as Partial Coarse Aggregate Replacements
title_sort	performance of concrete mixes containing tbm muck as partial coarse aggregate replacements
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/b3d7d4d9f8bc43e5ac00ac9055431288
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_version_	1718432021715353600

Performance of Concrete Mixes Containing TBM Muck as Partial Coarse Aggregate Replacements

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