Mechanical performance of FRP-confined and unconfined crumb rubber concrete containing high rubber content

Youssf, Osama; Hassanli, Reza; Mills, Julie E.

doi:10.1016/j.jobe.2017.04.011

Cited by 136 publications

(68 citation statements)

References 41 publications

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“…Moreover, the choice of these parameters for every formulation was different case-by-case, often showing inconsistent values, thus making the numerical values here extrapolated extremely wide and difficult to compare. For instance, Youssf et al [65], series 22A, declared a specific gravity for crumb rubber equal to 0.85, which is outside the values observed in the literature for vulcanized rubber. As another example, Gesoglu et al [51], series 8A, use tire chips with specific gravity 1.02 and crumb rubber with specific gravity of 0.83 and 0.48.…”

Section: Bibliography Data Manipulationmentioning

confidence: 82%

“…Thus, both the x-axis and the y-axis do not present comparable data. Considering the compression strength, it is evident in Figure 1 that, for instance, the values at 10% rubber substitution that are in the 50-70 MPa range (series 15A, 20A, 22A, 24A [59,63,65,67]) are Considering the compression strength, it is evident in Figure 1 that, for instance, the values at 10% rubber substitution that are in the 50-70 MPa range (series 15A, 20A, 22A, 24A [59,63,65,67]) are very high mostly due to the use of high-strength concrete. Other series, for instance 7A and 7B [50], have a much lower reduction in strength, but since their reference concrete has a lower strength, they seem less performing with strength values in the 20-35 MPa range.…”

Section: Bibliography Data Manipulationmentioning

confidence: 98%

“…However, it is worth noting that, based on data analysis, the chemical treatment of rubber with chemical agents (e.g., NaOH) has almost no tangible effects on the mechanical performance of the cement composite even when using high-performance cement [24,48,62,66]. (iv) Lastly, using a high-performance cement as matrix can significantly reduce the loss of mechanical properties for high substitution degree of the mineral aggregate fraction [24,37,[57][58][59]62,63,65,67].…”

Section: Considerations On Specific Case Studiesmentioning

confidence: 99%

See 2 more Smart Citations

An Analytical Mini-Review on the Compression Strength of Rubberized Concrete as a Function of the Amount of Recycled Tires Crumb Rubber

et al. 2020

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Since waste tires constitute a serious environmental concern, several studies are devoted to the use of finely divided recycled rubber for the production of rubberized concrete by partial substitution of the mineral aggregate fraction. The introduction of rubber into concrete presents several advantages (e.g., improvement of toughness and thermal/electrical/acoustic insulation capacities). Unfortunately, the addition of a high content of rubber into concrete causes an important loss of mechanical resistance of the final composite. In this context, several scientific studies are devoted to investigate the best technical solutions for favoring the interfacial adhesion between rubber and cement paste, but the interpretation of the literature is often misleading. To overcome this issue, the metadata extrapolated from the single scientific works were critically re-analyzed, forming reference diagrams where the variability fields of the different rubber concrete formulations (in terms of mechanical responses as a function of the rubber content) were defined and the best performances discussed. This study evidenced the twofold role of reference diagrams, able in both presenting the data in an unambiguous manner (for a successful comparison) and providing the guidelines for future works in this research field.

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Section: Bibliography Data Manipulationmentioning

confidence: 82%

Section: Bibliography Data Manipulationmentioning

confidence: 98%

Section: Considerations On Specific Case Studiesmentioning

confidence: 99%

See 1 more Smart Citation

An Analytical Mini-Review on the Compression Strength of Rubberized Concrete as a Function of the Amount of Recycled Tires Crumb Rubber

et al. 2020

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“…The presence of rubber particles in concrete modifies its microstructure, which directly influences the interlocking behaviour between rebar ribs and concrete keys and consequently the splitting and crushing actions near the interface region. Additionally, the mechanical properties of rubberised concrete under external confinement are strongly modified for high rubber replacements [44][45][46], hence the bond behaviour of deformed bars in confined rubberised concrete is also expected to change. Although some information exists on rebar-rubberised concrete interface behaviour, it is limited to bond strengths rather than the full bond-slip behaviour, whilst the influence of confinement has not been investigated.…”

Section: Introductionmentioning

confidence: 99%

Bond-slip response of deformed bars in rubberised concrete

Bompa

Elghazouli

2017

Construction and Building Materials

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This paper is concerned with examining the complete bond-slip behaviour between deformed reinforcement bars and concrete incorporating rubber particles from recycled tyres as partial replacement for mineral aggregates. An experimental study consisting of fifty-four pull-out tests on cylindrical rubberised and normal concrete specimens, in conjunction with two reinforcement sizes with short embedment lengths, is described. In addition to a detailed assessment of the full bondslip relationship, the test results offer a direct interpretation of bond behaviour under practical levels of confinement and its influence on the failure modes. Particular emphasis is given to the characteristic bond behaviour of rubberised concrete in terms of maximum bond strength and splitting strength as well bond stiffness and slip parameters. The detailed test measurements and observations provided in this study enable the definition of key bond parameters depicting the interfacial behaviour between rubberised concrete and deformed bars. The findings also permit the development of modified approaches for reliable representation of the failure modes and bond capacities for the concrete materials considered in this investigation.

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“…A lot of studies have been conducted for partial replacement of mineral aggregate by rubber content in concrete [1][2][3][4][5][6][7][8][9][10]. Low compressive and tensile strength as compared to normal concrete was reported by the addition of rubber particles in concrete [11,12]. However, the amount of damage caused by the addition of rubber in compressive strength of rubberized concrete is dependent on the size, and type of rubber replacement [13].…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigation and Statistical Modeling of FRP Confined RuC Using Response Surface Methodology

2019

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Scrap tires that are dumped to landfill is a serious problem in China and rest of the world. The use of rubber in concrete is an effective environmental approach to reduce the amount of scrap tires around the world. However, the loss in compressive strength of concrete is a major drawback of rubberized concrete. In this paper, the fiber reinforced polymer (FRP) confinement technique is used to overcome the drawbacks of rubberized concrete (RuC). A total of sixty six RuC cylinders were tested in axial compression. The cylinders were cast using recycled rubber to replace, a) 0-50 percent fine aggregate volume, b) 0-50 percent coarse aggregate volume, and c) 40-50 percent fine and coarse aggregate volume. Twenty seven cylinders of the latter mix were then confined with one, two and three layers of CFRP jackets. Concrete suffered a substantial reduction in compressive strength up to 80 percent by fine and coarse aggregate replacement with rubber content. However, CFRP jackets recovered and further enhanced the axial compressive strength of RuC up to 600% over unconfined RuC. SEM was performed to investigate the microstructural properties of RuC. Statistical models were developed on the basis of experimental tests for FRP confined RuC cylinders using response surface method. The effect of variable factors; unconfined concrete strength, rubber replacement type and number of FRP layers on confined compressive concrete strength was investigated. The regression analysis was performed to develop the response equations based on quadratic models. The predicted and experimental test results were found in good agreement as the variation between experimental and predicted values were less than 5%. Furthermore, the difference between predicted and adjusted R2 was found to be less than 0.2 which shows the significance of the statistical models. These proposed statistical models can provide a better understanding to design the experiments and the parameters affecting FRP-confined RuC cylinders.

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Mechanical performance of FRP-confined and unconfined crumb rubber concrete containing high rubber content

Cited by 136 publications

References 41 publications

An Analytical Mini-Review on the Compression Strength of Rubberized Concrete as a Function of the Amount of Recycled Tires Crumb Rubber

An Analytical Mini-Review on the Compression Strength of Rubberized Concrete as a Function of the Amount of Recycled Tires Crumb Rubber

Bond-slip response of deformed bars in rubberised concrete

Experimental Investigation and Statistical Modeling of FRP Confined RuC Using Response Surface Methodology

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