Material properties, processing &amp; characterization of fly ash based geopolymer

Bohra, Vinay Kumar Jain; Nerella, Ruben; Madduru, Sri Rama Chand

doi:10.1016/j.matpr.2019.10.099

Cited by 8 publications

(4 citation statements)

References 7 publications

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“…Since that, 𝐶𝐶𝑂𝑂𝑅𝑅 has become one of the main global sources of energy used in combustion and chemical processes. The emissions of Carbon dioxide (𝑅𝑅𝐶𝐶 2 ) represent about 7% to 8% from global 𝑅𝑅𝐶𝐶 2 production, which is annually reach to 1.5 Giga-tons [4,5]. Construction containing 𝐶𝐶𝑂𝑂𝑅𝑅 has some limitations as a result of increasing environmental pollution and corrosion than blended with natural and/or by-product materials e.g.…”

Section: Introductionmentioning

confidence: 99%

“…[6]. Nowadays, concrete industry is shifting towards a green and sustainable infrastructure, and this can be done by employing natural resources or by-products that are now substituted for cement in the construction industry [4]. Currently, a partial or a total replacement of Portland cement by natural Pozzolana or by-product materials is a promising choice to produce a concrete similar to 𝐶𝐶𝑂𝑂𝑅𝑅 concrete.…”

Section: Introductionmentioning

confidence: 99%

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Performance of Zero Cement Concrete Synthesized from Fly Ash: A Critical Review

Hassoon,

Aied Qissab

2023

E3S Web Conf.

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Since the invention of the reinforced concrete (RC) technique, RC buildings have comprised the majority of extant building systems. The shift from traditional materials to green or low/zero carbon designed materials that are energy efficient, such as fly ash (FA), is recognized as one of the desirable approaches to reduce CO2 emissions and the climate change crisis. This review aims to summarize the performance of fly ash based Zero Cement Concrete (FA − ZCC) according to the main parameters: Fly ash types (ASTM FA Class F and Class C), precursor activator, molarity (Sodium Hydroxide concentration), modulus ratio (SiO2/Na2O), mixture design, mixing approach, compressive strength (f’c), modulus of elasticity (MOE), splitting tensile (ft), curing time, and curing technique. The findings of this critical review show that the compressive strength of FA-ZCC Class C is higher in comparison with Class F FA − ZCC. Ambient curing for ZCC made from FA Class C was more suitable compared with Class F, which needed high-temperature curing. Increasing molarity up to 14 led to better ZCC regardless the type of FA. Modulus of elasticity and tensile strength of FA − ZCC was found to be similar to or lesser than those for normal cement concrete. Besides, standard approaches should be provided to enhance the mixture design technique, mixing procedure approach, mechanical properties of ZCC synthesized by FA.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Performance of Zero Cement Concrete Synthesized from Fly Ash: A Critical Review

Hassoon,

Aied Qissab

2023

E3S Web Conf.

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“…(ii) transportation or diffusion of Al and Si ions and the formation of small, coagulated structures; and (iii) their polycondensation to form hydrated products [19,20]. Many natural minerals [21][22][23], calcined clays [24][25][26], and industrial by-products such as blast furnace slag [27], fly ash [28][29][30][31][32], rice husk ash [33], waste glass [34], and red mud [35] can be used as additional materials for the synthesis of geopolymers [17,36]. Therefore, geopolymer technology is an important solution for industrial waste utilization, the amount of which increases every year [8,17].…”

Section: Introductionmentioning

confidence: 99%

Hybrid Materials Based on Fly Ash, Metakaolin, and Cement for 3D Printing

et al. 2021

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Nowadays, one very dynamic development of 3D printing technology is required in the construction industry. However, the full implementation of this technology requires the optimization of the entire process, starting from the design of printing ideas, and ending with the development and implementation of new materials. The article presents, for the first time, the development of hybrid materials based on a geopolymer or ordinary Portland cement matrix that can be used for various 3D concrete-printing methods. Raw materials used in the research were defined by particle size distribution, specific surface area, morphology by scanning electron microscopy, X-ray diffraction, thermal analysis, radioactivity tests, X-ray fluorescence, Fourier transform infrared spectroscopy and leaching. The geopolymers, concrete, and hybrid samples were described according to compressive strength, flexural strength, and abrasion resistance. The study also evaluates the influence of the liquid-to-solid ratio on the properties of geopolymers, based on fly ash (FA) and metakaolin (MK). Printing tests of the analyzed mixtures were also carried out and their suitability for various applications related to 3D printing technology was assessed. Geopolymers and hybrids based on a geopolymer matrix with the addition of 5% cement resulted in the final materials behaving similarly to a non-Newtonian fluid. Without additional treatments, this type of material can be successfully used to fill the molds. The hybrid materials based on cement with a 5% addition of geopolymer, based on both FA and MK, enabled precise detail printing.

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“…e chemical structure of the alkaline-activated fly ash geopolymer generated from polymerisation provides many beneficial engineering characteristics [5]. It has been shown previously that, in many cases, geopolymer concrete (GPC) outperforms ordinary Portland cement concrete (OPC) with respect to the compressive strength [7], deformation resistance, and bond with the reinforcing bars [8].…”

Section: Introductionmentioning

confidence: 99%

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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Material properties, processing & characterization of fly ash based geopolymer

Cited by 8 publications

References 7 publications

Performance of Zero Cement Concrete Synthesized from Fly Ash: A Critical Review

Performance of Zero Cement Concrete Synthesized from Fly Ash: A Critical Review

Hybrid Materials Based on Fly Ash, Metakaolin, and Cement for 3D Printing

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

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