Shrinkage properties of plain and recycled steel–fibre-reinforced rapid hardening mortars for repairs

Al-musawi, Hajir; Figueiredo, Fábio P.; Guadagnini, Maurizio; Pilakoutas, Kypros

doi:10.1016/j.conbuildmat.2018.11.099

Cited by 26 publications

(9 citation statements)

References 25 publications

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“…about 18.8% lower than that of F0. This finding is consistent with Al-musawi et al (2019) that RTSF with high tensile strength can bridge the crack induced by shrinkage, which transfers the stress leading to the enhancement in tensile strength. Regarding the hybrid fibre combination, increasing the PPF content did not induce a consistent trend in reducing the drying shrinkage.…”

Section: Drying Shrinkagesupporting

confidence: 91%

Experimental study on engineering properties of concrete reinforced with hybrid recycled tyre steel and polypropylene fibres

Zhong

Zhang

2020

Journal of Cleaner Production

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Recycled tyre steel fibre (RTSF) is considered as a potential and sustainable alternative to manufactured steel fibre (MSF), while RTSF resulted in lower energy absorption capacity and more serious corrosion problem in concrete compared to MSF. This paper presents an experimental study on engineering properties of concrete reinforced with hybrid RTSF (0.5%e0.9% V f ) and polypropylene fibre (PPF, 0.1% e0.5% V f ). Results show that combining RTSF with PPF could compensate the serious workability loss caused by RTSF and the workability was improved by 38.9%e66.7%. However, the compressive, splitting tensile and flexural strengths were weakened significantly when PPF was over 0.3% V f in hybrid fibre reinforcement (total content of 1.0% V f ). The strain field shown in digital image correlation images suggests that hybrid RTSF and PPF can create a synergistic effect in restraining the crack growth and the post-cracking behaviour of concrete especially toughness that was enhanced with the presence of PPF. RTSF was more effective in restraining shrinkage of concrete than PPF. With the increase of PPF content in hybrid fibre reinforcement, the chloride migration coefficient of concrete was reduced by 4.9%e6.8% as compared with the mixture reinforced with only RTSF.

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Section: Drying Shrinkagesupporting

confidence: 91%

Experimental study on engineering properties of concrete reinforced with hybrid recycled tyre steel and polypropylene fibres

Zhong

Zhang

2020

Journal of Cleaner Production

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“…Besides the geometric properties, the purity of recycled tyre steel fibres also plays a crucial role in the effective reinforcement of cement composites with RTSFs. As supported by numerous scientific papers [ 15 , 24 , 26 , 34 , 35 , 36 , 37 , 38 , 39 ], rubber and textile contaminants present in untreated tyre steel fibres have a deteriorating effect on reinforcement effectiveness by, for example, creating a continuous barrier on the fibre surface, reducing the adhesion of the fibres to the cement matrix.…”

Section: Discussionmentioning

confidence: 99%

“…Studies of the effects of various types of tyre fibres and their mixture with manufactured steel fibres on the rheological and mechanical properties of concrete [ 26 , 34 , 35 , 36 ] indicate that, due to the presence of rubber and textile contaminants and steel dust, higher amounts of the steel cord obtained from tyres should be added compared to manufactured steel fibres. The most commonly used and financially viable tyre recycling methods involve a combination of mechanical shredding and granulation to produce steel fibres with irregular shapes, lengths, and diameters.…”

Section: Introductionmentioning

confidence: 99%

Effectiveness of Concrete Reinforcement with Recycled Tyre Steel Fibres

et al. 2022

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The role of searching for industrial waste management solutions in construction is key for environmental protection. Research in recent years has focused on solutions aimed at reducing the carbon footprint. This paper presents the results of tests conducted on concrete reinforced with treated recycled tyre steel fibres (RTSFs) compared to the same amount of manufactured steel fibres (MSFs). The effectiveness of concrete reinforcement with RTSFs was analysed using the fracture mechanics parameters of cementitious composites. Rheological tests, residual flexural tensile strength tests, work of fracture measurements, toughness indices, examinations of the fibre distribution in the concrete, and SEM observations of the concrete fractures with fibres were performed. Determining the work of fracture and toughness indices was an innovative aspect of this paper. As the amount of RTSFs increased, a decrease in the consistency was observed, although the distribution of fibres in the concrete was uniform, as proven by the results of computer tomography tests. Concrete reinforced with RTSFs that is purified and refined during the recycling process might have better properties than concrete reinforced with the same amount of MSFs. The application of RTSFs in construction has environmental and economic benefits in addition to the strengthening of cementitious composites.

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“…In some papers, the RSF content of mortars is referenced for concluding the optimized content of RSF for concrete. For example, Liew and Akbar [ 12 ] and Ahmed et al [ 31 ] reported that the research carried out by [ 32 ] showed that 45 kg/m 3 of RSF increased the compressive strength of the concrete. However, research by the authors [ 32 ] was related to the impact of RSF on cement mortars, not concrete.…”

Section: Introductionmentioning

confidence: 99%

“…For example, Liew and Akbar [ 12 ] and Ahmed et al [ 31 ] reported that the research carried out by [ 32 ] showed that 45 kg/m 3 of RSF increased the compressive strength of the concrete. However, research by the authors [ 32 ] was related to the impact of RSF on cement mortars, not concrete. Similarly, the research of [ 33 ] was related to incorporating RSF in mortars, and [ 12 ] reported it as concrete.…”

Section: Introductionmentioning

confidence: 99%

A Comprehensive Review of Incorporating Steel Fibers of Waste Tires in Cement Composites and Its Applications

et al. 2022

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Accumulating vast amounts of pollutants drives modern civilization toward sustainable development. Construction waste is one of the prominent issues impeding progress toward net-zero. Pollutants must be utilized in constructing civil engineering structures for a green ecosystem. On the other hand, large-scale production of industrial steel fibers (ISFs) causes significant damage to the goal of a sustainable environment. Recycled steel fibers (RSFs) from waste tires have been suggested to replace ISFs. This research critically examines RSF’s application in the mechanical properties’ improvement of concrete and mortar. A statistical analysis of dimensional parameters of RSFs, their properties, and their use in manufacturing various cement-based composites are given. Furthermore, comparative assessments are carried out among the improvements in compressive, split tensile, and flexural strengths of plain and RSF-incorporated concrete and mortar. In addition, the optimum contents of RSF for each strength property are also discussed. The influence of RSFs parameters on various strength properties of concrete and mortars is discussed. The possible applications of RSF for various civil engineering structures are reviewed. The limitations and errors noticed in previous review papers are also outlined. It is found that the maximum enhancement in compressive strength (CS), split tensile strength (STS), and flexure strength (FS) are 78%, 149%, and 157%, respectively, with the addition of RSF into concrete. RSF increased cement mortars’ CS, STS, and FS by 46%, 50.6%, and 69%, respectively. The current study encourages the building sector to use RSFs for sustainable concrete.

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Shrinkage properties of plain and recycled steel–fibre-reinforced rapid hardening mortars for repairs

Cited by 26 publications

References 25 publications

Experimental study on engineering properties of concrete reinforced with hybrid recycled tyre steel and polypropylene fibres

Experimental study on engineering properties of concrete reinforced with hybrid recycled tyre steel and polypropylene fibres

Effectiveness of Concrete Reinforcement with Recycled Tyre Steel Fibres

A Comprehensive Review of Incorporating Steel Fibers of Waste Tires in Cement Composites and Its Applications

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