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Shear behaviour of seawater sea-sand coral aggregate concrete beams reinforced with FRP strip stirrups
Highlights The effects of concrete strength, concrete type, and stirrup configuration on the shear behaviour of the SSCAC beams were experimentally tested. The diagonal shear crack developments of the SSCAC beams changed with the types of stirrups and concrete strength. The variations of the shear strength components Vs and Vc with increasing beam deflection were analyzed. The fracture characteristic of coral aggregate caused the loss of the aggregate interlocking when a shear diagonal crack formed, which weakens the ultimate shear strength.
Abstract The preparation of concrete for remote islands or reefs using locally available seawater, sea sand, and coral aggregate can greatly shorten the construction period and mitigate the shortage of river sand and natural gravel resources. This study is the first to experimentally investigate the shear behaviour of seawater sea-sand coral aggregate concrete (SSCAC) beams reinforced with non-corrosive carbon fibre-reinforced polymer (CFRP) strip stirrups. The test parameters included concrete strength, concrete type, and stirrup configuration. The experimental results suggested that CFRP-reinforced SSCAC beams exhibited a brittle shear failure mode because of the sudden CFRP rupture at the bend portions. The ratio of the measured maximum strain to the ultimate tensile strain of the CFRP strip stirrups varied from 36.6% to 47.8%. The critical diagonal shear cracks of SSCAC beams directly penetrated through the coral aggregates and split the aggregates, whereas those in the natural aggregate concrete (NAC) beams bypassed the natural gravel. In this regard, the SSCAC beams exhibited approximately 10% lower shear strength than their NAC counterparts owing to the loss of the aggregate interlocking effect after the occurrence of smooth diagonal shear cracks. The higher the strength grade of SSCAC, the greater the shear strength and service load.
Shear behaviour of seawater sea-sand coral aggregate concrete beams reinforced with FRP strip stirrups
Highlights The effects of concrete strength, concrete type, and stirrup configuration on the shear behaviour of the SSCAC beams were experimentally tested. The diagonal shear crack developments of the SSCAC beams changed with the types of stirrups and concrete strength. The variations of the shear strength components Vs and Vc with increasing beam deflection were analyzed. The fracture characteristic of coral aggregate caused the loss of the aggregate interlocking when a shear diagonal crack formed, which weakens the ultimate shear strength.
Abstract The preparation of concrete for remote islands or reefs using locally available seawater, sea sand, and coral aggregate can greatly shorten the construction period and mitigate the shortage of river sand and natural gravel resources. This study is the first to experimentally investigate the shear behaviour of seawater sea-sand coral aggregate concrete (SSCAC) beams reinforced with non-corrosive carbon fibre-reinforced polymer (CFRP) strip stirrups. The test parameters included concrete strength, concrete type, and stirrup configuration. The experimental results suggested that CFRP-reinforced SSCAC beams exhibited a brittle shear failure mode because of the sudden CFRP rupture at the bend portions. The ratio of the measured maximum strain to the ultimate tensile strain of the CFRP strip stirrups varied from 36.6% to 47.8%. The critical diagonal shear cracks of SSCAC beams directly penetrated through the coral aggregates and split the aggregates, whereas those in the natural aggregate concrete (NAC) beams bypassed the natural gravel. In this regard, the SSCAC beams exhibited approximately 10% lower shear strength than their NAC counterparts owing to the loss of the aggregate interlocking effect after the occurrence of smooth diagonal shear cracks. The higher the strength grade of SSCAC, the greater the shear strength and service load.
Shear behaviour of seawater sea-sand coral aggregate concrete beams reinforced with FRP strip stirrups
Yuan, Fang (author) / Wang, Yian (author) / Li, Peng-Da (author) / Li, Huihui (author)
Engineering Structures ; 290
2023-05-14
Article (Journal)
Electronic Resource
English
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