Mechanical Properties of Recycled Aggregate Concretes Containing Silica Fume and Steel Fibres

In this study, the impact of steel fibres and Silica Fume (SF) on the mechanical properties of recycled aggregate concretes made of two different types of Recycled Coarse Aggregates (RCA) sourced from both low- and high-strength concretes were evaluated through conducting 60 compressive strength tes...

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Autores principales:	Soheil Jahandari, Masoud Mohammadi, Aida Rahmani, Masoumeh Abolhasani, Hania Miraki, Leili Mohammadifar, Mostafa Kazemi, Mohammad Saberian, Maria Rashidi
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	compressive behaviour elastic modulus recycled aggregates steel fibres silica fume 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/56976c8015bd4c31ab9954cdd6421168
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spelling	oai:doaj.org-article:56976c8015bd4c31ab9954cdd64211682021-11-25T18:16:05ZMechanical Properties of Recycled Aggregate Concretes Containing Silica Fume and Steel Fibres10.3390/ma142270651996-1944https://doaj.org/article/56976c8015bd4c31ab9954cdd64211682021-11-01T00:00:00Zhttps://www.mdpi.com/1996-1944/14/22/7065https://doaj.org/toc/1996-1944In this study, the impact of steel fibres and Silica Fume (SF) on the mechanical properties of recycled aggregate concretes made of two different types of Recycled Coarse Aggregates (RCA) sourced from both low- and high-strength concretes were evaluated through conducting 60 compressive strength tests. The RCAs were used as replacement levels of 50% and 100% of Natural Coarse Aggregates (NCA). Hook-end steel fibres and SF were also used in the mixtures at the optimised replacement levels of 1% and 8%, respectively. The results showed that the addition of both types of RCA adversely affected the compressive strength of concrete. However, the incorporation of SF led to compressive strength development in both types of concretes. The most significant improvement in terms of comparable concrete strength and peak strain with ordinary concrete at 28 days was observed in the case of using a combination of steel fibres and SF in both recycled aggregate concretes, especially with RCA sourced from high strength concrete. Although using SF slightly increased the elastic modulus of both recycled aggregate concretes, a substantial improvement in strength was observed due to the reinforcement with steel fibre and the coexistence of steel fibre and SF. Moreover, existing models to predict the elastic modulus of both non-fibrous and fibrous concretes are found to underestimate the elastic modulus values. The incorporation of SF changed the compressive stress-strain curves for both types of RCA. The addition of steel fibre and SF remarkably improved the post-peak ductility of recycled aggregates concretes of both types, with the most significant improvement observed in the case of RCA sourced from a low-strength parent concrete. The existing model to estimate the compressive stress-strain curve for steel fibre-reinforced concrete with natural aggregates was found to reasonably predict the compressive stress-strain behaviour for steel fibres-reinforced concrete with recycled aggregate.Soheil JahandariMasoud MohammadiAida RahmaniMasoumeh AbolhasaniHania MirakiLeili MohammadifarMostafa KazemiMohammad SaberianMaria RashidiMDPI AGarticlecompressive behaviourelastic modulusrecycled aggregatessteel fibressilica fumeTechnologyTElectrical engineering. Electronics. Nuclear engineeringTK1-9971Engineering (General). Civil engineering (General)TA1-2040MicroscopyQH201-278.5Descriptive and experimental mechanicsQC120-168.85ENMaterials, Vol 14, Iss 7065, p 7065 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	compressive behaviour elastic modulus recycled aggregates steel fibres silica fume 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	compressive behaviour elastic modulus recycled aggregates steel fibres silica fume 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 Soheil Jahandari Masoud Mohammadi Aida Rahmani Masoumeh Abolhasani Hania Miraki Leili Mohammadifar Mostafa Kazemi Mohammad Saberian Maria Rashidi Mechanical Properties of Recycled Aggregate Concretes Containing Silica Fume and Steel Fibres
description	In this study, the impact of steel fibres and Silica Fume (SF) on the mechanical properties of recycled aggregate concretes made of two different types of Recycled Coarse Aggregates (RCA) sourced from both low- and high-strength concretes were evaluated through conducting 60 compressive strength tests. The RCAs were used as replacement levels of 50% and 100% of Natural Coarse Aggregates (NCA). Hook-end steel fibres and SF were also used in the mixtures at the optimised replacement levels of 1% and 8%, respectively. The results showed that the addition of both types of RCA adversely affected the compressive strength of concrete. However, the incorporation of SF led to compressive strength development in both types of concretes. The most significant improvement in terms of comparable concrete strength and peak strain with ordinary concrete at 28 days was observed in the case of using a combination of steel fibres and SF in both recycled aggregate concretes, especially with RCA sourced from high strength concrete. Although using SF slightly increased the elastic modulus of both recycled aggregate concretes, a substantial improvement in strength was observed due to the reinforcement with steel fibre and the coexistence of steel fibre and SF. Moreover, existing models to predict the elastic modulus of both non-fibrous and fibrous concretes are found to underestimate the elastic modulus values. The incorporation of SF changed the compressive stress-strain curves for both types of RCA. The addition of steel fibre and SF remarkably improved the post-peak ductility of recycled aggregates concretes of both types, with the most significant improvement observed in the case of RCA sourced from a low-strength parent concrete. The existing model to estimate the compressive stress-strain curve for steel fibre-reinforced concrete with natural aggregates was found to reasonably predict the compressive stress-strain behaviour for steel fibres-reinforced concrete with recycled aggregate.
format	article
author	Soheil Jahandari Masoud Mohammadi Aida Rahmani Masoumeh Abolhasani Hania Miraki Leili Mohammadifar Mostafa Kazemi Mohammad Saberian Maria Rashidi
author_facet	Soheil Jahandari Masoud Mohammadi Aida Rahmani Masoumeh Abolhasani Hania Miraki Leili Mohammadifar Mostafa Kazemi Mohammad Saberian Maria Rashidi
author_sort	Soheil Jahandari
title	Mechanical Properties of Recycled Aggregate Concretes Containing Silica Fume and Steel Fibres
title_short	Mechanical Properties of Recycled Aggregate Concretes Containing Silica Fume and Steel Fibres
title_full	Mechanical Properties of Recycled Aggregate Concretes Containing Silica Fume and Steel Fibres
title_fullStr	Mechanical Properties of Recycled Aggregate Concretes Containing Silica Fume and Steel Fibres
title_full_unstemmed	Mechanical Properties of Recycled Aggregate Concretes Containing Silica Fume and Steel Fibres
title_sort	mechanical properties of recycled aggregate concretes containing silica fume and steel fibres
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/56976c8015bd4c31ab9954cdd6421168
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Mechanical Properties of Recycled Aggregate Concretes Containing Silica Fume and Steel Fibres

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