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

Abstract

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.

A multi-criteria evaluation and optimization of sustainable fiber-reinforced concrete developed with nylon waste fibers and micro-silica

“…The use of MSF improves the crack-resistance, tensile and bending behavior of cementitious materials (Kazmi et al 2018a). Munir et al (2021) noticed an increase in the energy absorption capacity, peak strength, and peak strains of plain concrete samples under axial compression load with the rise in macro-polypropylene bers. An increase in the tensile and exural strength of concrete has also been observed with the use of MSF (Das et al 2018; Kazmi et al 2018a;Ali et al 2020b).…”

Prediction of Ecofriendly Concrete Compressive Strength Using Gradient Boosting Regression Tree Combined with GridSearchCV Hyperparameter-Optimization Techniques

“…The use of demolition waste as RA to create RAC has been investigated by several researchers [ 53 , 54 ]. However, RAC characteristics are inferior to NCA when porous mortar binds the RA [ 15 ].…”

A Statistical Model of Fibre Distribution in a Steel Fibre Reinforced Concrete

“…It also significantly improves post-cracking properties under tension [ 2 ] and increases the strength in impact tests [ 3 , 4 , 5 , 6 , 7 ], affects well long-term performance when exposed to aggressive environment [ 8 ]. The addition of fibres in concrete develops the stress transfer mechanism by bridging cracks [ 9 ]. Due to good physical and mechanical parameters of SFRC it is applied for making various structural elements such as foundation slabs [ 10 ], bridge slabs [ 11 ], industrial floors [ 12 ], columns [ 13 , 14 ] or tunnel elements [ 15 , 16 , 17 , 18 ].…”