Flexural strength and failure of geopolymer concrete beams reinforced with carbon fibre-reinforced polymer bars

Ahmed, Hemn Qader; Jaf, Dilshad Kakasor Ismael; Yaseen, Sinan Abdulkhaleq

doi:10.1016/j.conbuildmat.2019.117185

Cited by 54 publications

(47 citation statements)

References 13 publications

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“…e specimens were designed according to ACI 440.1R-15 [11]. e experimental program consists of six RGPC beams with the same target compressive strength (50 MPa) and divided into two groups: three specimens reinforced with GFRP bars (G1) and the rest with CFRP bars (G2) [21], and the properties of fabric texture coated FRP bars are presented in Table 1. All the test specimens have a height of 300 mm, while the width of specimens in G1 and G2 [21] was 160 and 110 mm, respectively.…”

Section: Test Specimens and Programmentioning

confidence: 99%

“…e experimental program consists of six RGPC beams with the same target compressive strength (50 MPa) and divided into two groups: three specimens reinforced with GFRP bars (G1) and the rest with CFRP bars (G2) [21], and the properties of fabric texture coated FRP bars are presented in Table 1. All the test specimens have a height of 300 mm, while the width of specimens in G1 and G2 [21] was 160 and 110 mm, respectively. e reason for choosing a different width in the two groups is to achieve the same reinforcement ratio (ρ f < ρ fb , ρ fb < ρ f < 1.4ρ fb , and ρ f > 1.4ρ fb ) and also to maintain the three modes of failure (tension failure, balanced failure, and compression failure).…”

Section: Test Specimens and Programmentioning

confidence: 99%

“…e first parameter investigated in this study was the reinforcement ratio (ρ f ) with respect to the balanced reinforcement ratio (ρ fb ). ree different reinforcement ratio conditions (ρ f < ρ fb , ρ fb < ρ f < 1.4ρ fb , and ρ f > 1.4 ρ fb ) were taken for each group (G1: GFRP-RGPC beams; G2: CFRP-RGPC beams [21]). e second investigated parameter was the types of FRP bars.…”

Section: Investigated Parametersmentioning

confidence: 99%

“…e second investigated parameter was the types of FRP bars. Two common types of FRP bars were selected (GFRP and CFRP bars) as longitudinal flexural reinforcement; beams in groups G1 and G2 were reinforced with GFRP and CFRP bars [21], respectively.…”

Section: Investigated Parametersmentioning

confidence: 99%

“…Most of the researchers focused on replacing OPC by GPC in steel-reinforced concrete structures. ere is a limited study that combined the GPC with GFRP bars, by taking limited parameters [19], and the only study that uses CFRP bars in GPC beams has been undertaken by Ahmed et al [21], in which the investigated parameters were the reinforcement ratio and concrete type. A logical step, therefore, is to investigate the flexural behaviour of GPC beams reinforced with two common types of FRP bars (GFRP and CFRP) by achieving a precise comparison condition.…”

Section: Introductionmentioning

confidence: 99%

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Comparison of the Flexural Performance and Behaviour of Fly‐Ash‐Based Geopolymer Concrete Beams Reinforced with CFRP and GFRP Bars

Ahmed

Jaf

Yaseen

2020

Advances in Materials Science and Engineering

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A construction system with high sustainability, high durability, and appropriate strength can be supplied by geopolymer concrete (GPC) reinforced with glass fibre-reinforced polymer (GFRP) bars and carbon fibre-reinforced polymer (CFRP) bars. Few studies deal with a combination of GPC and FRP bars, especially CFRP bars. The present investigation presents the flexural capacity and behaviour of fly-ash-based GPC beam reinforced with two different types of FRP bars: six reinforced geopolymer concrete (RGPC) beams consisting of three specimens reinforced with GFRP bars and the rest with CFRP bars. The beams were tested under four-point bending with a clear span of 2000 mm. The test parameters included the longitudinal-reinforcement ratio and the longitudinal-reinforcement type, including GFRP and CFRP. Ultimate load, first crack load, load-deflection behaviour, load-strain curve, crack width, and the modes of failure were studied. The experimental results were compared with the equations recommended by ACI 440.1R-15 and CSA S806-12 for flexural strength and midspan deflection of the beams. The results show that the reinforcement ratio had a significant effect on the ultimate load capacity and failure mode. The ultimate load capacity of CFRP-RGPC beams was higher than that of GFRP-RGPC, more crack formations were observed in the CFRP-RGPC beams than in the GFRP-RGPC beams, and the crack width in the GFRP-RGPC beams was more extensive than that in the CFRP-RGPC beams. Beams with lower reinforcement ratios experienced a fewer number of crack and a higher value of crack width, while numerous cracks and less value of crack width were observed in beams with higher reinforcement ratio. Beams with the lower reinforcement ratios were more affected by the type of FRP bars, and the deflection in GFRP-RGPC beams was higher than that in CFRP-RGPC beams for the same corresponding load level. ACI 440.1R-15 and CSA S806-12 underestimated the flexural strength and midspan deflection of RGPC beams; however, CSA S806-12 predicted more accurately.

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Section: Test Specimens and Programmentioning

confidence: 99%

Section: Test Specimens and Programmentioning

confidence: 99%

Section: Investigated Parametersmentioning

confidence: 99%

Section: Investigated Parametersmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Comparison of the Flexural Performance and Behaviour of Fly‐Ash‐Based Geopolymer Concrete Beams Reinforced with CFRP and GFRP Bars

Ahmed

Jaf

Yaseen

2020

Advances in Materials Science and Engineering

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Study on the flexural properties and fiber‐selection method of fiber‐reinforced geopolymer concrete

Zhao

Wang

et al. 2022

Structural Concrete

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In order to study the effect of different types of fibers on the bending properties of geopolymer concrete (GPC), a series of fiber‐reinforced geopolymer concrete (FRGPC) samples were prepared, and their flexural properties were evaluated by four point bending test and bending toughness evaluation index. Then, based on the fiber characteristic value (λ), a new bending strength prediction model and a three‐dimensional (3D) curved surface prediction model of the bending toughness of FRGPC are proposed and fitted. Finally, a new method for the selection of fibers in GPC is designed by calculating the derivative of the quadratic relationship between fiber reinforcement factor (S) and λ. The results show that all types of fibers have a certain effect on improving the bending strength of GPC samples, and the lifting rate is end‐hook steel fiber (SF), basalt fiber (BF), and short polyethylene polypropylene fiber (SPPF), from high to low. Mixing the above types of fibers with long polypropylene fibers (LPPF) will produce better performance. Among them, the hybrid fiber‐containing SF has the best performance. The bending performance prediction model deduced in this paper has a good correlation coefficient, which can be used to predict the bending performance of FRGPC. By making dS/dλ = 0 can calculate the optimal λ, and this λ can maximize the parameter S and guide the selection of optical fibers.

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Numerical Analysis of Geopolymer Concrete Beams Incorporated Hybrid GFRP-Steel Reinforcement

Kadhim,

Zinkaah

2024

Current Trends in Civil Engineering and Engineering Sciences 2024, Vol 2

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Flexural strength and failure of geopolymer concrete beams reinforced with carbon fibre-reinforced polymer bars

Cited by 54 publications

References 13 publications

Comparison of the Flexural Performance and Behaviour of Fly‐Ash‐Based Geopolymer Concrete Beams Reinforced with CFRP and GFRP Bars

Comparison of the Flexural Performance and Behaviour of Fly‐Ash‐Based Geopolymer Concrete Beams Reinforced with CFRP and GFRP Bars

Study on the flexural properties and fiber‐selection method of fiber‐reinforced geopolymer concrete

Numerical Analysis of Geopolymer Concrete Beams Incorporated Hybrid GFRP-Steel Reinforcement

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