Evaluation of the flexural strength and serviceability of geopolymer concrete beams reinforced with glass-fibre-reinforced polymer (GFRP) bars

Maranan, Ginghis B.; Manalo, Allan; Benmokrane, Brahim; Karunasena, Warna; Mendis, Priyan

doi:10.1016/j.engstruct.2015.08.003

Cited by 134 publications

(56 citation statements)

References 28 publications

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“…3 findings were reported. The behaviour of GPC beams were investigated in several experimental studies [16][17][18][19][20][21][22] while other studies examined the structural performance of GPC columns [23][24][25][26]. In general, these studies showed the structural response of the GPC beams and columns was almost identical to that of OPC and thus concluded that the current design codes and models for OPC structures can be applied to calculate the strength of GPC beams and columns.…”

Section: Accepted Manuscriptmentioning

confidence: 99%

Rectangular Stress-block Parameters for Fly-ash and Slag Based Geopolymer Concrete

Tran

Pham

2019

Structures

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Although there has been a numerous quantity of studies investigating the mechanical properties of geopolymer concrete (GPC), parameters for designing GPC structures are still not systematically investigated and carefully justified. ACI rectangular stress-block parameters is able to predict well the strength of conventional concrete structures but their applicability for GPC is questionable. This study aims to establish new sets of rectangular stress-block parameters for GPC with a broad range of the compressive strength up to 66 MPa. The proposed rectangular stress-block parameters in this study are based on two analytical concrete stress-strain models and measured curves from previous studies of GPC materials. The results from this study show that the use of ACI recommendations for concrete structure in designing GPC beams is still acceptable with high accuracy. However, the axial load-carrying capacity of GPC columns computed by ACI parameters deviate significantly from the experimental results while the proposed parameters provide a good correlation with these experimental data. The significant difference is mainly due to the modification of k 3 , which is the ratio of concrete strength in real structures to standard cylinder samples. This study suggests that the assumption of k 3 =0.9 in previous studies for conventional Portland concrete is not suitable for use in deriving the stress-block parameters of GPC. In some cases, this ratio should be reduced to 0.7 depending on the curing condition.

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Section: Accepted Manuscriptmentioning

confidence: 99%

Rectangular Stress-block Parameters for Fly-ash and Slag Based Geopolymer Concrete

Tran

Pham

2019

Structures

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“…Maranan et al have investigated the flexural strength of glass fibre-reinforced polymer-reinforced geopolymer concrete (GFRP-RGPC) beams. e authors argued that the diameter of the bar had no significant effect on the beam's flexural performance, and the serviceability behaviour of a beam enhanced when the reinforcement ratio increases [19]. e GFRP-RGPC beams have structural properties that are suitable for civil infrastructure applications [20].…”

Section: Introductionmentioning

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%

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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“…These authors showed that the geopolymer concrete beam strength results are viable for the use as structural elements, however they detected cracking in the curing stage and indicated that further analysis should be pursued. Maranan et al [22] investigated the structural performance of five GFRP-reinforced beams and compared their results to a steel-reinforced geopolymer concrete beam (the control specimen). As a result, they showed that the bending-moment capacities at concrete crushing failure of the GFRP-reinforced geopolymer concrete beams were 1.2-1.5 times greater than the one of the steel-reinforced geopolymer concrete beam with similar reinforcement ratio.…”

Section: Introductionmentioning

confidence: 99%

Structural analysis of composite metakaolin-based geopolymer concrete

Pelisser

Silva

Menger

et al. 2018

Rev. IBRACON Estrut. Mater.

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The study of alternative binders to Portland cement, such as geopolymer cements, offers the chance to develop materials with different properties. With this purpose, this study evaluated experimentally the mechanical behavior of a geopolymer concrete beam and compared to a Finite Element (FE) nonlinear numerical model. Two concrete beams were fabricated, one of Portland cement and another of metakaolin-based geopolymer cement. The beams were instrumented with linear variable differential transformers and strain gauges to measure the deformation of the concrete and steel. Values for the compressive strength of the geopolymer cement concrete was 8% higher than the Portland cement concrete (55 MPa and 51 MPa, respectively) and the tensile rupture strength was also 8% higher (131 kN) for the geopolymer concrete beam in relation to Portland cement concrete beam (121 kN). Distinct failure mechanisms were verified between the two samples, with an extended plastic deformation of the geopolymer concrete, revealing post-fracture toughness. The geopolymer concrete showed higher tensile strength and better adhesion in cement-steel interface.

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Evaluation of the flexural strength and serviceability of geopolymer concrete beams reinforced with glass-fibre-reinforced polymer (GFRP) bars

Cited by 134 publications

References 28 publications

Rectangular Stress-block Parameters for Fly-ash and Slag Based Geopolymer Concrete

Rectangular Stress-block Parameters for Fly-ash and Slag Based Geopolymer Concrete

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

Structural analysis of composite metakaolin-based geopolymer concrete

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