Flexural behaviour of ambient cured geopolymer concrete beams reinforced with BFRP bars under static and impact loads

Huang, Zhijie; Chen, Wensu; Hao, Hong; Chen, Zuyu; Pham, Thanh-Hang; Tran, Tung T.; Elchalakani, Mohamed

doi:10.1016/j.compstruct.2020.113282

Cited by 42 publications

(10 citation statements)

References 56 publications

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“…Subsequently, quasi-static bending tests were conducted to determine the residual behavior. The residual behavior has also been reported by a group of studies [19][20][21]. The residual strength of geopolymer concrete beams was increased with the inclusion of fiber [21].…”

Section: Introductionsupporting

confidence: 68%

Residual Strength of Reinforced Concrete Beams under Sequential Small Impact Loads

et al. 2021

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Sequential small impact loads may not collapse structures directly but could weaken the strength of structures. This study aimed to investigate the impact of these sequential small impact loads on the strength of the reinforced concrete beams. First, six sequential impact loads were applied to the test specimens. Then, the residual static capacity of the impacted specimens was determined by the ultimate static load test, compared with those of undamaged specimens. The experiment was composed of 12 specimens having identical dimensions. The variable parameters were the magnitude of the axial load and shear reinforcement. Under the sequential small impacts, the axial load improves the impact performance. It reduces the tensile strain of the longitudinal reinforcement. Hence, the flexural tensile crack propagation is limited. In addition, the local damage at the impact location is minimized and the shear plug induced diagonal shear crack is prevented. The axial force is also able to diminish the adverse effect of the large spacing stirrups. Large impact load could alter the failure of a designed flexural critical reinforced concrete beam without axial load to the shear failure. Although the axial load improves the impact response, the Residual Resistance Index (RRI) decreases with axial load. For the damaged specimens with axial load, the ultimate static load is lower than the calculated concrete shear capacity and more severe diagonal shear cracks were found. It can be obviously said that the prior impact damage decreases the concrete shear capacity.

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Section: Introductionsupporting

confidence: 68%

Residual Strength of Reinforced Concrete Beams under Sequential Small Impact Loads

et al. 2021

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“…The raw materials used in this study consisted of fly ash and ground granulated blast-furnace slag (GGBS) as binder materials, sand as fine aggregates, gravels with the maximum size of 10 mm (50%) and 7 mm (50%) as coarse aggregates, and 12-M sodium hydroxide (NaOH) and D-grade sodium silicate (Na2SiO3) solutions as alkaline activators. Table 1 gives two mix designs with different weight ratios of alkaline solution to binder (Deb et al 2014;Huang et al 2020;Tran et al 2019). The labels of mix designs, i.e.…”

Section: Raw Materials and MIX Proportionsmentioning

confidence: 99%

“…It is worth noting that the GPC specimens in the aforementioned studies (Feng et al 2014(Feng et al , 2015Tang et al 2020) were heat cured at an elevated temperature (i.e. 60 ℃ or 75 ℃) for 24 h. Recently, the studies on the beams made of ambient-cured GPC under impact loads have been reported (Huang et al 2020(Huang et al , 2021, but studies to quantify the dynamic mechanical properties of ambient-cured GPC, which are not necessarily the same as heat-cured GPC, are very limited. Understanding the dynamic mechanical properties of ambient-cured GPC is essential for accurate prediction of the dynamic response of such structures in numerical simulations.…”

Section: Introductionmentioning

confidence: 99%

Test of Dynamic Mechanical Properties of Ambient-Cured Geopolymer Concrete Using Split Hopkinson Pressure Bar

Huang¹,

Chen

Hao

et al. 2022

J. Mater. Civ. Eng.

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The application of geopolymer concrete (GPC) in construction could reduce a large amount of carbon dioxide (CO2) emission, which is greatly beneficial to the environmental sustainability. Structures made of GPC might be subjected to extreme loading such as impact and blast loads. Therefore, a good understanding on the dynamic properties of GPC is essential to provide reliable predictions of performance of GPC structures subjected to dynamic loading. This study presents an experimental investigation on the dynamic compressive and splitting tensile properties of ambient-cured GPC using Split Hopkinson Pressure Bar (SHPB), with the strain rate up to 161.0 s -1 for dynamic compression and 10.3 s -1 for dynamic splitting tension. The failure mode and damage progress of GPC specimens, energy absorption and dynamic increase factor (DIF) were studied. Test results showed that ambient-cured GPC exhibited strain rate sensitivity. The compressive and splitting tensile DIFs increased with the strain rate and the ambient-cured GPC with lower quasistatic compressive strength exhibited higher DIFs under both dynamic compression and splitting

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“…Some of the research works that have been carried out on GPC were reviewed in this section. Zhijie Huang (2020) used the GPC subjected to ambient curing. The alkaline solution used was a mixture of 12 M sodium hydroxide (NaOH) and commercial D-grade sodium silicate (Na2SiO3) solution.…”

Section: Review On Properties Of Gpcmentioning

confidence: 99%

Performance of Geopolymer Concrete Reinforced with FRP Rebars - A Review

Saikumar¹,

Kumaran²

2021

revistageintec

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The advantages of FRP reinforcements have made the researchers to concentrate on the various studies of FRP reinforcements for repair and strength of RC structures in the recent past years. FRP rods have proven their excellence in the construction of structures which are exposed to corrosion. Similarly, Geopolymer (GPC) concrete outstands prominently with its distinct properties like improved strength, resistant to acid, fire flames, sulphate, lesser shrinkage and creep. This paper reviews the important and extensive studies conducted by the researchers to bring out the important aspects related with the flexural performance of FRP reinforcements in GPC.

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Flexural behaviour of ambient cured geopolymer concrete beams reinforced with BFRP bars under static and impact loads

Cited by 42 publications

References 56 publications

Residual Strength of Reinforced Concrete Beams under Sequential Small Impact Loads

Residual Strength of Reinforced Concrete Beams under Sequential Small Impact Loads

Test of Dynamic Mechanical Properties of Ambient-Cured Geopolymer Concrete Using Split Hopkinson Pressure Bar

Performance of Geopolymer Concrete Reinforced with FRP Rebars - A Review

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