Flexural Behavior of Low Calcium Fly Ash Based Geopolymer Reinforced Concrete Beam

Alex, Alexander Gladwin; Tewele, Tsegay Gebrehiwet; Kemal, Zeyneb; Subramanian, R.

doi:10.1186/s40069-022-00531-x

Cited by 20 publications

(6 citation statements)

References 47 publications

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“…In general, the midspan deflections at 𝑃 𝑢 of GPC beams were 18% greater than OPC beams due to the lower stiffness of GPC beams than OPC beams with similar fc'. Alex et al [57] reported that GPC beams exhibited 9% greater midspan deflection than OPC beams. Zinkaah et al [22] also reported that midspan deflections of GPC beams were greater than OPC beams.…”

Section: Applied Loads (P U ) and Midspan Deflections Of Opc And Gpc ...mentioning

confidence: 99%

Shear Behavior of Geopolymer Concrete Slender Beams

et al. 2023

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This study investigates the shear behavior of slender steel-reinforced geopolymer concrete (GPC) beams with the shear span to effective depth ratio (a/d) of 4.5 and 5.0. To investigate the effect of shear reinforcement, two ordinary Portland cement concrete (OPC) beams and two GPC beams without shear reinforcement, and two OPC beams and two GPC beams reinforced with shear stirrups were cast. All beams were 150 mm wide and 225 mm deep with lengths of 1770 mm (a/d=4.5) and 1950 mm (a/d=5). The beams were tested under a three-point bending test. The experimental results showed that OPC and GPC beams without and with shear reinforcements exhibited similar crack propagation and failure mechanism. The midspan deflections of GPC beams were greater than OPC beams. The normalized shear resistance of OPC and GPC beams with a/d ratio 4.5 was greater than 4% and 30%, respectively, than beams with a/d ratio 5. OPC beams showed a greater decrease in shear resistance with an increasing a/d ratio compared to GPC beams. The shear resistances computed using empirical relationships available in various OPC design codes including AC1-318-14, AC1-318-19, fib-10 and JSCE-07 underestimated the experimental shear resistance of both OPC and GPC beams. In addition, the environmental assessment of OPC and GPC beams exhibited that GPC beams emit about 34% lower embodied CO2 emissions than OPC beams.

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Section: Applied Loads (P U ) and Midspan Deflections Of Opc And Gpc ...mentioning

confidence: 99%

Shear Behavior of Geopolymer Concrete Slender Beams

et al. 2023

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“…The primary objective is to compare the load-carrying capacity of cement and geopolymer concrete slabs under static and impact loading conditions. The strength of conventional concrete decreases when exposed to temperatures beyond 600°C, but by adding a higher percentage of nano silica fume, the strength of the concrete can be increased at high temperatures, improving its durability and performance [1]. Concrete undergoes changes in physical and chemical properties when subjected to high temperatures [2].…”

Section: Introductionmentioning

confidence: 99%

Behaviour of fire damaged cement and geopolymer concrete slabs under static and impact loading

Ulagambika,

Murugan

2024

Matéria (Rio J.)

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Fire is considered one of the most serious potential risks for buildings and structures, as was demonstrated in the 9/11 twin tower failure. If a structure is damaged by fire, it is necessary to investigate the cause of the fire and evaluate the reusability of the damaged structure. Concrete structures often collapse in fire due to material degradation and thermal expansion. Geopolymer concrete has the potential to reduce carbon emission globally and lead to sustainable development to form an important contributor towards environmentally sustainable construction and building products industry. It proposed to be a more eco-friendly replacement to Portland cement. The experimental results of Cement and Geopolymer concrete slabs subjected to high temperatures are presented in this study. This study exclusively focuses on assessing the load-carrying capacity of fire-damaged Cement and Geopolymer Concrete structural elements. The slab specimens were subjected to temperatures of 200, 400, 600 and 800°C for a period of 1, 2, and 3 hours. The results showed that the ultimate load-carrying capacity of both cement and geopolymer concrete slabs increased when exposed to 200ºC for 1 hour. However, beyond this point, the capacity started to decrease. Nevertheless, a decline in ultimate load capacity was noted for higher temperature ranges and prolonged fire exposure durations. When exposed to high temperature, the chemical composition and physical structure of the geopolymer concrete change considerably.

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“…Portland cement-based concrete has become the second most widely used material worldwide after water, and it was expected that the global annual cement production would be 5.9 billion tons in 2020 [ 1 ]. Moreover, it's increased by 10% every year [ 2 ]. The massive production of Ordinary Portland Cement OPC, which consumes a lot of energy and natural resources, emits a lot of carbon dioxide CO2 into the atmosphere.…”

Section: Introductionmentioning

confidence: 99%

“…Among precursor materials, fly ash is the most popular source material that is used to produce GPC [ 4 , 14 , 22 ]. The utilisation of low-calcium fly ash-based GPC was recommended as a replacement for OPC concrete because it performed better and had fewer environmental disasters [ 2 ]. Fly-ash-based GPC shows many advantages.…”

Section: Introductionmentioning

confidence: 99%