Bending and Shear Behaviour of Waste Rubber Concrete-Filled FRP Tubes with External Flanges

Ferdous, Wahid; Alajarmeh, Omar; Zhuge, Yan; Mohammed, Ali A.; Bai, Yu; Aravinthan, Thiru; Schubel, Peter

doi:10.3390/polym13152500

Cited by 11 publications

(5 citation statements)

References 43 publications

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“…The results defined the R 2 value equals to 0.86. The developed equation is provided below: f cu = 0.0554ρ − 100.55; R 2 = 0.70; Adjusted R 2 = 0.69 (1) where,…”

Section: Correlationships Between Density Thermal and Mechanical Prop...mentioning

confidence: 99%

“…The properties of rubberised concrete are affected by the parameters of rubber particles, namely rubber content, rubber particle size, and surface conditions of rubber particles. The mechanical properties of rubberised concrete are negatively affected as the content of rubber particles increases [1][2][3], attributed to the poor bonding between rubber particles and the cement matrix and the low stiffness of rubber.…”

Section: Introductionmentioning

confidence: 99%

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Thermal and Mechanical Properties of Concrete Incorporating Silica Fume and Waste Rubber Powder

et al. 2022

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Using waste rubber tires for concrete production will reduce the demand for natural aggregate and help to reduce environmental pollution. The main challenge of using waste rubber tires in concrete is the deterioration of mechanical properties, due to poor bonding between rubber and cement matrix. This research aims to evaluate the mechanical and thermal properties of rubberised concrete produced by using different proportions of rubber powder and silica fume. Ordinary Portland cement was partially replaced with silica fume by amounts of 5%, 10%, 15% and 20%, while sand was replaced by 10%, 20% and 30% with waste rubber powder. Tests were carried out in order to determine workability, density, compressive strength, splitting tensile strength, elastic modulus, thermal properties, water absorption and shrinkage of rubberised concrete. The compressive strength and splitting tensile strength of concrete produced using waste rubber powder were reduced by 10–52% and 9–57%, respectively. However, the reduction in modulus of elasticity was 2–36%, less severe than compressive and splitting tensile strengths. An optimum silica fume content of 15% was observed based on the results of mechanical properties. The average shrinkage of concrete containing 15% silica fume increased from −0.051% to −0.085% at 28 days, as the content of waste rubber powder increased from 10% to 30%. While the thermal conductivity of rubberised concrete was reduced by 9–35% compared to the control sample. Linear equations were found to correlate the density, splitting tensile strength, modulus of elasticity and thermal conductivity of concrete with silica fume and waste rubber powder.

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“…The results defined the R 2 value equals to 0.86. The developed equation is provided below: f cu = 0.0554ρ − 100.55; R 2 = 0.70; Adjusted R 2 = 0.69 (1) where,…”

Section: Correlationships Between Density Thermal and Mechanical Prop...mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Thermal and Mechanical Properties of Concrete Incorporating Silica Fume and Waste Rubber Powder

et al. 2022

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“…The accuracy of the stress-strain model can be judged by comparing the predicted curves with the test curves. The specific operation is to substitute the theoretical values of peak stress f cc , peak strain ε cc , ultimate stress f cu and ultimate strain ε cu of confined concrete columns into Equations (10) and (11) to determine the values of parameters a and c, thus obtaining the predicted stress-strain relationship curves of confined concrete column specimens in this database. Figure 14 compares the model prediction curve with the actual test curve of partially stirrup-only confined concrete columns studied by this test and others in the database.…”

Section: Model Performancementioning

confidence: 99%

“…At present, the research on the mechanical properties of FRP-confined concrete has been very sufficient. Research mainly focuses on the axial compression or eccentric compression properties of FRP-confined concrete [3][4][5][6][7][8][9], and some novel research, such as Wahid Ferdous et al [10], studied the bending and shear behaviour of waste rubber concrete-filled FRP tubes with external flanges. In addition, FRP can also be made into FRP reinforcement with superior environmental and mechanical properties to replace ordinary reinforcement.…”

Section: Introductionmentioning

confidence: 99%

Influence of the Cross-Sectional Shape and Corner Radius on the Compressive Behaviour of Concrete Columns Confined by FRP and Stirrups

Wei

Wang

et al. 2022

Polymers

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Axial compression tests were carried out on 72 FRP (fiber reinforced polymer)–stirrup composite−confined concrete columns. Stirrups ensure the residual bearing capacity and ductility after the FRP fractures. To reduce the effect of stress concentration at the corners of the confined square−section concrete columns and improve the restraint effect, an FRP–stirrup composite−confined concrete structure with rounded corners is proposed. Different corner radii of the stirrup and outer FRP were designed, and the corner radius of the stirrup was adjusted accurately to meet the designed corner radius of the outer FRP. The cross−section of the specimens gradually changed from square to circular as the corner radius increased. The influence of the cross−sectional shape and corner radius on the compressive behaviour of FRP–stirrup composite−confined concrete was analysed. An increase in the corner radius can cause the strain distribution of the FRP to be more uniform and strengthen the restraint effect. The larger the corner radius of the specimen, the better the improvement of mechanical properties. The strength of the circular section specimen was greatly improved. In addition, the test parameters also included the FRP layers, FRP types and stirrup spacing. With the same corner radius, increasing the number of FRP layers or densifying the stirrup spacing effectively improved the mechanical properties of the specimens. Finally, a database of FRP–stirrup composite−confined concrete column test results with different corner radii was established. The general calculation models were proposed, respectively, for the peak points, ultimate points and stress–strain models that are applicable to FRP−, stirrup− and FRP–stirrup−confined concrete columns with different cross−sectional shapes under axial compression.

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“…The current traditional methods for waste concrete are landfills or littered in the open, which not only occupies large amounts of land but also causes the waste of resources. Many scholars at home and abroad have used crushed and graded waste concrete to replace natural coarse aggregate (NCA) to prepare recycled aggregate concrete (RAC) [2][3][4]. It was found that recycled coarse aggregate (RCA) had the characteristic features of lower tensile strength, weak interfacial zone (ITZ), and higher porosity compared with NCA [5][6][7], which limited the practical engineering applications of RAC.…”

Section: Introductionmentioning

confidence: 99%

Compressive Behavior, Microstructural Properties, and Freeze–Thaw Behavior of Tailing Recycled Aggregate Concrete with Waste Polypropylene Fiber Addition

et al. 2021

Materials

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To improve the high brittleness of recycled aggregate concrete containing iron ore tailings (TRAC), the feasibility of adding polypropylene fiber (PPF) to TRAC was studied by performing a compression stress–strain curve test, scanning electron microscope characterization, and a freeze–thaw cycle test. The results indicated that PPF had a beneficial impact on reducing the brittleness of TRAC. With the increase in PPF content, the peak strain increased, the elastic modulus decreased, and the peak stress and energy absorption capacity increased at first and then decreased. Furthermore, the microstructure investigation revealed that the interface friction between the PPF, aggregate, and cement matrix was the main source of energy dissipation. When the load acted on the concrete, the stress was dispersed to the fiber monofilaments, thus effectively enhancing the peak stress and peak strain of concrete and suppressing the generation and development of cracks in the concrete. In terms of freeze–thaw resistance, adding a small amount of PPF could reduce the negative effects of the freeze–thaw process on the cement matrix. On the premise of ensuring strength, the waste utilization should be as high as possible. Therefore, it was suggested that the content of PPF in fiber-reinforced tailings recycled aggregate concrete (TRAC-PP) should be 0.6%.

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Bending and Shear Behaviour of Waste Rubber Concrete-Filled FRP Tubes with External Flanges

Cited by 11 publications

References 43 publications

Thermal and Mechanical Properties of Concrete Incorporating Silica Fume and Waste Rubber Powder

Thermal and Mechanical Properties of Concrete Incorporating Silica Fume and Waste Rubber Powder

Influence of the Cross-Sectional Shape and Corner Radius on the Compressive Behaviour of Concrete Columns Confined by FRP and Stirrups

Compressive Behavior, Microstructural Properties, and Freeze–Thaw Behavior of Tailing Recycled Aggregate Concrete with Waste Polypropylene Fiber Addition

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