Reliability Based Design of RC Beams With Recycled Aggregate and Steel Fibres

Kang, Won‐Hee; Ramesh, Rakul Bharatwaj; Mirza, Olivia; Senaratne, Sepani; Tam, Vivian W.Y.; Wigg, Dane

doi:10.1016/j.istruc.2017.05.002

Cited by 19 publications

(11 citation statements)

References 22 publications

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“…Many researchers reported in the literature, the mechanical properties particularly the tensile strength and modulus of elasticity of concrete were significantly decreased due to the incorporation of recycled aggregate either partial or full . To overcome these negative effects of recycled aggregate concrete, a few researchers have introduced the SFs in recycled aggregate concrete . Carneiro et al .…”

Section: Introductionmentioning

confidence: 99%

Influence of different types of fiber on the properties of recycled aggregate concrete

Meesala

2019

Structural Concrete

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Utilization of recycled aggregate from the construction and demolition waste as a partial substitution of natural aggregate in the concrete has been increased in the recent times in order to minimize the consumption of natural resources and the harmful effects to the environment. The present investigation mainly focuses on the influence of different fibers on mechanical and other properties of concrete made with 50% of recycled coarse aggregate (RCA) as well as concrete with 100% natural aggregate. Three types of fibers such as Woolen fibers (WF), Glass fibers (GF), and Steel fibers (SF) were used in both normal and recycled aggregate concrete mixes. The workability, compressive strength, split tensile and flexural strengths, modulus of elasticity, density, water absorption and volume of voids, and ultrasonic pulse velocity (UPV) properties of all the mixes were investigated. From the experimental findings it was observed that the fibers significantly improve the mechanical properties of both normal and recycled aggregate concretes. Further among the WF, GF, and SF, SFs had shown more positive impact on the properties of concrete. K E Y W O R D S compressive strength, flexural strength, glass fibers, recycled aggregate concrete, steel fibers, ultrasonic pulse velocity (UPV), woolen fibers

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Section: Introductionmentioning

confidence: 99%

Influence of different types of fiber on the properties of recycled aggregate concrete

Meesala

2019

Structural Concrete

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“…Furthermore, the presence of fibres in RAC has recently been investigated (Afroughsabet et al, 2017;Gao et al, 2017;Kang et al, 2017;Senaratne et al, 2016;Vaishali and Rao, 2012). Generally, presence of fibres influences concrete behaviour in compression, flexure, tension and crack development.…”

Section: Improving Properties Of Racmentioning

confidence: 99%

The potency of recycled aggregate in new concrete: a review

Anike

Saïdani

Ganjian

et al. 2019

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Purpose This paper aims to review the effect of using recycled aggregates (RA) on the properties of recycled aggregate concrete (RAC) following the steady rise in global demand for concrete and the large generation of construction and demolition waste. Design/methodology/approach This study reviewed relevant literature of research work carried out by previous researchers, leading to a deeper understanding of the properties of both RA and RAC. The properties of RA and RAC reported in the various studies were then compared to their corresponding natural aggregate (NA) and natural aggregate concrete, as well as the specifications provided in different codes of practice. In addition, the mix design methods appropriate to RAC and the cost implication of using RA were reviewed. Findings Findings show that the contribution of RA to strength appears inferior in comparison to NA. The shortcoming is attributed to the mortar attached to the RA, which raises its water absorption capacity and lowers its density relative to those of NA. However, it has been reported that the use of regulated quantity of RA, new mixing and proportioning methods, the addition of admixtures and strengthening materials such as steel fibres, can improve both mechanical and durability properties of RAC. Cost evaluation also showed that some savings can be realized by using RA instead of NA. Originality/value This research serves as a guide for future works and suggests that the use of RA as aggregate in new concrete is technically possible, depending on the mix design method adopted.

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“…In this context, various techniques, including pre-soaking in acid, mechanical grinding, presoaking in water, pozzolan slurry, heat grinding, polymer emulsion, carbonation, and calcium carbonate bio deposition, were used to enhance the performance of RAC [37][38][39][40][41][42]. A variety of fibres were also used to improve the deformation, bending, compressive, ductility, toughness, impact, and fatigue performance of RAC [43][44][45][46][47][48]. Steel fibre-reinforced RAC with 25% coarse natural aggregates (CNA) replaced with coarse recycled aggregates (CRA) showed a 13% rise in compressive strength for a 0.75% steel fibre dosage [45].…”

Section: Introductionmentioning

confidence: 99%

Axial Stress-Strain Performance of Recycled Aggregate Concrete Reinforced with Macro-Polypropylene Fibres

Munir

Kazmi

et al. 2021

Sustainability

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The addition of macro-polypropylene fibres improves the stress-strain performance of natural aggregate concrete (NAC). However, limited studies focus on the stress-strain performance of macro-polypropylene fibre-reinforced recycled aggregate concrete (RAC). Considering the variability of coarse recycled aggregates (CRA), more studies are needed to investigate the stress-strain performance of macro-polypropylene fibre-reinforced RAC. In this study, a new type of 48 mm long BarChip macro-polypropylene fibre with a continuously embossed surface texture is used to produce BarChip fibre-reinforced NAC (BFNAC) and RAC (BFRAC). The stress-strain performance of BFNAC and BFRAC is studied for varying dosages of BarChip fibres. Results show that the increase in energy dissipation capacity (i.e., area under the curve), peak stress, and peak strain of samples is observed with an increase in fibre dosage, indicating the positive effect of fibre addition on the stress-strain performance of concrete. The strength enhancement due to the addition of fibres is higher for BFRAC samples than BFNAC samples. The reduction in peak stress, ultimate strain, toughness and specific toughness of concrete samples due to the utilisation of CRA also reduces with the addition of fibres. Hence, the negative effect of CRA on the properties of concrete samples can be minimised by adding BarChip macro-polypropylene fibres. The applicability of the stress-strain model previously developed for macro-synthetic and steel fibre-reinforced NAC and RAC to BFNAC and BFRAC is also examined.

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Reliability Based Design of RC Beams With Recycled Aggregate and Steel Fibres

Cited by 19 publications

References 22 publications

Influence of different types of fiber on the properties of recycled aggregate concrete

Influence of different types of fiber on the properties of recycled aggregate concrete

The potency of recycled aggregate in new concrete: a review

Axial Stress-Strain Performance of Recycled Aggregate Concrete Reinforced with Macro-Polypropylene Fibres

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