Assessment of the mechanical performance of crumb rubber concrete

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

doi:10.1016/j.conbuildmat.2016.08.040

Cited by 233 publications

(79 citation statements)

References 29 publications

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“…Moreover, going more in detail, it is possible to highlight different trends. Liu et al 7B [50] obtained a reduction of only 4% of the compression strength with a substitution of the aggregate fraction with rubber of 7 vol.%., whereas other studies reported at least 15% reduction for the same amount of rubber (1AB, 3AB, 5AB, 6A, 8A, 11A, 12A, 13AB [44,46,48,49,51,[54][55][56]). The works written by Zheng et al, 10AB, [53] and Najim et al, 27ABC, [57] also report interesting performances, with a lower reduction of compression strength than most of the case studies here analyzed (moreover, this difference is more evident when increasing the amount of rubber inside the composites).…”

Section: Reference Diagrams and Their Critical Interpretationmentioning

confidence: 95%

“…Figure 3 reports the same data of Figure 2, but highlighting the effects due to rubber pre-treatments/modifications. The surface modification of the crumb rubber by means of appropriate pre-treatments (e.g., NaOH washing, controlled oxidation) and/or further surface functionalization (e.g., coatings deposition) is a technical solution investigated by worldwide researchers to overcome the interfacial adhesion concerns with the other inorganic components (mostly the cement paste), principally responsible for the loss of mechanical properties in rubberized concrete [48]. Few data are available; however, four series (5B, 29A, 23A and 25B) can be separated from the others, since the rubber in these cases underwent a chemical treatment with NaOH.…”

Section: Reference Diagrams and Their Critical Interpretationmentioning

confidence: 99%

“…(iii) As pointed out by He et al, Liu et al and Sgobba et al [23,24,50], the adhesion problems between the components can be partially overcome by imposing a light chemical treatment on the rubber, before introducing it into the desired cement paste. 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%

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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: Reference Diagrams and Their Critical Interpretationmentioning

confidence: 95%

Section: Reference Diagrams and Their Critical Interpretationmentioning

confidence: 99%

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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“…Another study showed a significant increase of strength after soaking of rubber aggregates in water for 24 h (Mohammadi and Khabbaz, 2015). Other studies showed that treatment using NaOH increases the compressive strength (Su et al, 2015;Youssf et al, 2016). A treatment with SCA has shown to result in a more drastic increase in compressive strength of more than 6.5% (Su et al, 2015).…”

Section: Introductionmentioning

confidence: 97%

Impact of Chemically Treated Waste Rubber Tire Aggregates on Mechanical, Durability and Thermal Properties of Concrete

et al. 2020

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Studies have shown that the incorporation of waste tire rubber aggregates reduces the strength, increases permeability and decrease thermal conductivity of concrete. However, only a few studies have investigated the effect of surface-modified rubber aggregates on the properties of concrete. This study investigates the effect of the surface treatment of waste tire rubber as coarse aggregates with different oxidizing solutions and different treatment durations on the mechanical, durability and thermal properties of concrete. The properties of concrete incorporated with 8% rubber coarse aggregates (by volume of natural aggregates) which were treated with three different solutions: water (H 2 O), 20% sodium hydroxide (NaOH) and 5% calcium hypochlorite [Ca(ClO) 2 ] (both as% weight of water) for durations of 2, 24, and 72 h, respectively. The effect of these treatments on the compressive strength, splitting tensile strength, water permeability, thermal conductivity and diffusivity of concrete was investigated. Results show that Ca(ClO)2 has a more positive effect on the strength and permeability compared to NaOH solution and water. Experimental results were statistically analyzed using ANOVA and Post Hoc tests. The analyses showed that the improvement of concrete strength is only significant when the treatment with NaOH and Ca(ClO) 2 is prolonged to 72 h. Furthermore, the microstructural analysis of concrete showed that the improvement in the strength is due to the improved bonding between cement paste and rubber aggregates as a result of surface treatment. This microstructural improvement also resulted in lower water permeability of concrete. However, the thermal conductivity and diffusivity increased when the surface treatment duration increases as there are less air voids in the samples. This study shows that, with appropriate pretreatment, a certain percentage of natural aggregates can be safely replaced with waste tire rubber aggregates while maintaining sufficient quality of the resulting concrete.

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“…Fourier Transform Infrared spectra (FTIR) were used and a microstructural analysis was carried out to find the change of functional groups on the surface of the modified crumb rubber [8]. The compressive strength test and flexural strength test were performed to measure mechanical properties of rubberized concrete [20][21][22][23][24][25]. The static modulus of elasticity in flexure was evaluated for each specimen.…”

Section: Introductionmentioning

confidence: 99%

Properties of high strength concrete containing surface-modified crumb rubber

2019

JCE

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This study presents a new approach on surface modification of crumb rubber using organoclay composites in order to improve the poor adhesion between cement paste and crumb rubber. The change in functional groups on the surface of modified crumb rubber was observed by FTIR spectra. Mineral admixtures such as silica fume and metakaolin were used as property enhancers. Tests on workability, compressive strength and flexural strength, static modulus of elasticity, impact resistance, sulphate attack, and acid attack, were conducted. The results show that the properties of concrete were enhanced by surface modification.

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Assessment of the mechanical performance of crumb rubber concrete

Cited by 233 publications

References 29 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

Impact of Chemically Treated Waste Rubber Tire Aggregates on Mechanical, Durability and Thermal Properties of Concrete

Properties of high strength concrete containing surface-modified crumb rubber

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