A review of properties and behaviour of reinforced geopolymer concrete structural elements- A clean technology option for sustainable development

Hassan, Amer; Arif, Mohammed; Shariq, M.

doi:10.1016/j.jclepro.2019.118762

Cited by 104 publications

(46 citation statements)

References 82 publications

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“…Figure 4 shows the GPC-steel interface of a beam-end specimen, where no visible cracks or crushing was observed on the concrete in front of the ribs, and the GPC was still firmly stuck to the ribbed bar after the tests. is result is consistent with formal observations for normal and highstrength GPC [39] but contrary to what was observed for OPC. Figure 5 illustrates that, on the OPC-steel interface, concrete in front of the ribs was crushed and exposed the mark of the steel ribs after pull-out tests.…”

Section: Failure Morphology On the Steel-concrete Interfacesupporting

confidence: 90%

Bond Stress between Steel‐Reinforced Bars and Fly Ash‐Based Geopolymer Concrete

Cui

Zhang

Bao

2020

Advances in Materials Science and Engineering

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Geopolymer concrete has been regarded as one of the most important green construction materials, which has been restrained in engineering applications partially due to a lack of bond studies. The structural performance of the reinforced concrete components primarily relies on the sufficient bond between the concrete and the reinforcing bars. Before being utilized in any concrete structure, GPC must demonstrate that it possesses understandable bond behaviour with commercial steel reinforcements. This work presents an experimental investigation on the bond stress of steel bars in reinforced geopolymer concrete (GPC) structures. Standard beam-end pull-out tests were conducted on GPC specimens reinforced with 16 mm plain and ribbed bars that were equipped with electrical resistance strain gauges. The longitudinal variation in the bond stress in the GPC beams during the pull-out tests was calculated and plotted, as well as the stress in steel bars. The cracks on the bond area of the GPC were compared with those of the corresponding ordinary Portland cement concrete (OPC), as well as the steel stress and bond stress. The results showed that the relative slip between plain bar and geopolymer concrete varies from 30–450 microns from the loaded end to the free end when the bond stress decreased by 83%. The relative slip between ribbed bar and geopolymer concrete varies from 280–3,000 microns from the loaded end to the free end when the bond stress decreased by 57%. Generally, GPC is different from OPC in terms of bond stress distribution.

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Section: Failure Morphology On the Steel-concrete Interfacesupporting

confidence: 90%

Bond Stress between Steel‐Reinforced Bars and Fly Ash‐Based Geopolymer Concrete

Cui

Zhang

Bao

2020

Advances in Materials Science and Engineering

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“…The industrial waste like fly ash, GGBFS, red mud, and silica fume are used as source materials in geopolymer concrete. The alkaline solution is prepared from potassium/sodiumbased soluble solutions [6][7][8][9][10][11][12][13]. The Alkaline-activation on these wastes like fly ash will be end product in the development of geopolymer Resin/Binder [14,15].…”

Section: Introductionmentioning

confidence: 99%

Exploration of mechanical and durability characteristics of fly ash-GGBFS based green geopolymer concrete

Bellum

Muniraj

Madduru³

2020

SN Appl. Sci.

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In this paper, the use and effect of Ground Granulated Blast Furnace Slag (GGBFS) addition to fly ash (FA) on the performance of Geopolymer Concrete was presented. A reference of Ordinary Portland cement concrete (OPC) mix was used to compare with geopolymer concrete. The effect of different proportions of GGBFS addition, ambient curing, and curing age on the properties of geopolymer concrete was reported. The concentration of sodium hydroxide solution with 8 M and solution to binder ratio as 0.4 were taken for all the mixes of geopolymer concrete. This paper reported an investigation data on the mechanical and durability characteristics of fly ash-GGBFS based geopolymer concrete and that data was compared with the control mix (OPC). SEM analysis was done on selected samples to estimate the microstructural characteristics. The results concluded that a geopolymer concrete mix containing 60% GGBFS and 40% fly ash at 28 days of ambient temperature achieved maximum compressive strength (55.63 MPa) and further performed durable under severe environmental conditions.

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“…Some of these geopolymer composites are reinforced box culverts, concrete pipes, pavements, structural elements, precast concrete such as railway sleeper and electric power pole and marine construction, reinforced box culverts, precast footway panels, the airport in southeast Queensland, Australia, etc. [20].…”

Section: Introductionmentioning

confidence: 99%

Effect of curing condition on the mechanical properties of fly ash-based geopolymer concrete

2019

Self Cite

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In the present study, the mechanical properties of geopolymer concrete (GPC) has been investigated. GPC represents a novel technology that is giving significant concern in industrial construction, especially in term of the current emphasis on sustainability. In this study, the NaOH and Na 2 SiO 3 solutions were used as an alkaline solution in all GPC mixes. Na 2 SiO 3 with 10 concentration of molarity, activator-to-FA ratio of 0.4, Na 2 SiO 3 /NaOH ratio of 1.75, and two curing regimes viz., ambient curing, and heat curing at 75 °C for 26 h were employed. The experimental results indicated that the geopolymer concrete strengths, modulus of elasticity, and other mechanical properties increased with heat curing as compared to ambient temperature curing. The elastic modulus of GPC was associated with the compressive strengths and similar to those of OPC concrete. Furthermore, the geopolymer concrete mixture requires proper mix proportion and temperaturecontrolled curing conditions to accomplish good results.

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A review of properties and behaviour of reinforced geopolymer concrete structural elements- A clean technology option for sustainable development

Cited by 104 publications

References 82 publications

Bond Stress between Steel‐Reinforced Bars and Fly Ash‐Based Geopolymer Concrete

Bond Stress between Steel‐Reinforced Bars and Fly Ash‐Based Geopolymer Concrete

Exploration of mechanical and durability characteristics of fly ash-GGBFS based green geopolymer concrete

Effect of curing condition on the mechanical properties of fly ash-based geopolymer concrete

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