An experimental investigation of the mechanical performance and structural application of LECA-Rubcrete

Youssf, Osama; Hassanli, Reza; Mills, Julie E.; Elrahman, Mohamed Abd

doi:10.1016/j.conbuildmat.2018.04.184

Cited by 57 publications

(22 citation statements)

References 24 publications

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“…The rubber aggregates had comparatively lower unit weight water absorption, and hydrophilicity, compared with the replaced aggregates, which caused the workability increase. Similar results have also been reported by [35,36]. The fine rubber showed a significant increase in concrete slump compared to a slight increase when using coarse rubber.…”

Section: Failure Mode and Test Observationsupporting

confidence: 89%

Axial Compression Behaviour of Hybrid Double-Skin Tubular Columns Filled with Rubcrete

et al. 2019

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Double-skin tubular columns (DSTCs) have become a competitive candidate for column members due to their important advantages compared with conventional reinforced concrete columns, including their better weight-to-strength ratio and ease of construction. Using Rubcrete in hybrid DSTCs is of great interest due to the potential of this system to overcome the Rubcrete material deficiencies and to add more ductility, toughness, seismic resistance, confinement effectiveness, and environmentally-friendly features to that structural system compared to conventional concrete. In this paper, hybrid DSTCs made out of Rubcrete, sandwiched between a fibre reinforced polymer (FRP) tube and a steel tube, were tested. The examined variables were concrete sand or stone replacement ratio (0% and 20%), FRP wall thickness (1- and 2-layers), steel wall thickness (3.2 mm and 4.5 mm), void ratio (50% and 76%), and void shape (circular or square). The axial and lateral stress–strain responses were monitored, measured, and compared. According to this investigation, using Rubcrete in hybrid DSTCs can enhance the axial and hoop strain capacities, especially with fine rubber particles. It was also observed that the adverse influence of using rubber on column ultimate capacity was much lower in DSTC specimens, compared with that of unconfined Rubcrete columns. Therefore, using Rubcrete with fine rubber particles is recommended in DSTC structural columns.

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Section: Failure Mode and Test Observationsupporting

confidence: 89%

Axial Compression Behaviour of Hybrid Double-Skin Tubular Columns Filled with Rubcrete

et al. 2019

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“…In addition, the high porosity of aggregate surface has a negative influence of concrete durability [25]. As mentioned in the other studies, mechanical properties of LWA can be improved and water absorption can be significantly decreased by applying surface treatment [26]. In this investigation, a mixture of cement and silica fume was used to form a thin layer on the surface of manufactured aggregates as presented in Figure 5.…”

Section: A Production Of Cold-bonded Lightweight Aggregatesmentioning

confidence: 85%

Development of Sustainable Lightweight Concrete Using C old-Bonded Lightweight Aggregates.(Dept.A)

Awad

2021

MEJ. Mansoura Engineering Journal

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“…The mixing procedure for all mixes was as follows: mix dry sand, stone, rubber (if any), and LECA (if any) for 1 min; add half of the water and mix for 1 min; rest for 2 min; add cement, remaining water, and admixtures, and then mix for 2 min. Due to the high water absorption of LECA particles, they were soaked in tap water for 24 h before the mixing day and then were left in air to dry the particle surface only [29].…”

Section: Concrete MIX Designmentioning

confidence: 99%

“…This is attributed to the low modulus of elasticity and high Poisson's ratio of concrete containing rubber, which results in a relatively ductile concrete with lower crushing compared to conventional concrete, even though the core concrete compressive strength was reduced due to the use of rubber particles instead of course aggregate. However, the LECA concrete could have immature sudden failure under stress due to the crushability and brittle failure of the LECA particles that control the crack development [29]. Using bolted shear connectors instead of welded ones in Rubcrete specimens caused a higher number of and wider cracks, which resulted in a reduced deformation capacity.…”

Section: Failure Modementioning

confidence: 99%

“…Steel plate thickness, and shear connector diameter, spacing, and shape are mainly suggested for future testing. LECA concrete could have immature sudden failure under stress due to the crushability and brittle failure of the LECA particles that control the crack development [29]. Using bolted shear connectors instead of welded ones in Rubcrete specimens caused a higher number of and wider cracks, which resulted in a reduced deformation capacity.…”

Section: Failure Modementioning

confidence: 99%

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Cyclic Performance of Steel–Concrete–Steel Sandwich Beams with Rubcrete and LECA Concrete Core

et al. 2019

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Due to the structural and economic features of steel–concrete–steel (SCS) structural systems compared with conventional reinforced concrete ones, they are now used for a range of structural applications. Rubcrete, in which crumbed rubber from scrap tires partially replaces mineral aggregates in concrete, can be used instead of conventional concrete. Utilizing rubber waste in concrete potentially results in a more ductile lightweight concrete that can introduce additional features to the SCS structural members. This study aimed to explore different concrete core materials in SCS beams and the appropriate shear connectors required. In this study, four SCS sandwich beams were tested experimentally under incrementally increasing flexure cyclic loading. Each beam had a length of 1000 mm, and upper and lower steel plates with 3 mm thickness sandwiched the concrete core, which had a cross-section of 150 mm × 150 mm. Two of the beams were constructed out of Rubcrete core with welded and bolted shear connectors, while the other two beams were constructed with welded shear connectors and either conventional concrete or lightweight expanded clay aggregate (LECA) concrete cores. The performance of the SCS sandwich beams including damage pattern, failure mode, load-displacement response, and energy dissipation behavior was compared. The results showed that, while Rubcrete was able to provide similar concrete cracking behavior and strength to that of conventional concrete, LECA concrete degraded the strength properties of SCS. Using bolted shear connectors instead of welded ones caused a high number of cracks that resulted in a reduced ductility and deflection capacity of the beam before failure. The rubberized concrete specimen presented an improved ductility and deflection capacity compared with its conventional concrete counterpart.

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An experimental investigation of the mechanical performance and structural application of LECA-Rubcrete

Cited by 57 publications

References 24 publications

Axial Compression Behaviour of Hybrid Double-Skin Tubular Columns Filled with Rubcrete

Axial Compression Behaviour of Hybrid Double-Skin Tubular Columns Filled with Rubcrete

Development of Sustainable Lightweight Concrete Using C old-Bonded Lightweight Aggregates.(Dept.A)

Cyclic Performance of Steel–Concrete–Steel Sandwich Beams with Rubcrete and LECA Concrete Core

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