The effect of micro-SiO2 and micro-Al2O3 additive on the strength properties of ceramic powder-based geopolymer pastes

Kaya, Mehmet

doi:10.1007/s10163-021-01323-3

Cited by 32 publications

(5 citation statements)

References 97 publications

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“…Modulus of elasticity of both M40 RGC and M70 RGC are observed to be lower than their corresponding conventional concrete mixes of similar grade. This observation is supported by observations of research studies carried out by past researchers [30,31,32].…”

Section: Mechanical Properties Of Mixessupporting

confidence: 80%

“…But the intrinsic modulus of N-A-S-H gel formed in low-calcium fly ash gel based geopolymer concrete is much smaller than that of the C-S-H gel formed in cement. The lower value of modulus of elasticity for geopolymer concrete than conventional concrete can be attributed to the low intrinsic modulus of N-A-S-H gel and higher initial micro-cracks formulation in geopolymer concrete [30,31,32]. Yield point was determined visually from load deflection curve and the yield point is stage where no significant increase in load was observed and deflection was increasing continuously.…”

Section: Mechanical Properties Of Mixesmentioning

confidence: 99%

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Short-term mechanical performance and flexural behavior of reinforced slag-fly ash-based geopolymer concrete beams in comparison to OPC-based concrete beams

Ojha¹,

Singh²,

Trivedi³

et al. 2022

Res. Eng. Struct. Mater.

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The study presents experimental investigation on short term mechanical properties and flexural behaviour of conventional Ordinary Portland Cement (OPC) based concrete and slag-fly ash based geopolymer concrete. Conventional and geopolymer concrete mixes were designed to achieve compressive strength equivalent to M40 and M70 grade as per Indian standard code. Mechanical properties of concrete mixes such as compressive strength, split tensile strength, flexural strength, modulus of elasticity and Poisson's ratio were evaluated and compared. The flexural behaviour of reinforced concrete beams for both conventional and geopolymer concrete has been studied using 4-point bend test. The findings suggest that geopolymer concrete shows comparable mechanical properties in terms of split tensile strength, flexural strength and Poisson's ratio. However, modulus of elasticity of geopolymer concrete is lower than the conventional concrete of equivalent strength. Studies on flexure behaviour of reinforced concrete beams shows that both geopolymer and conventional concrete exhibit comparable flexural behavior in terms of load-deflection curves, yield load and yield moment. The amount of energy dissipated in flexure is marginally higher for high strength conventional concrete. Based on the visible cracks developed in flexure, it was concluded that the reinforced conventional concrete and reinforced geopolymer concrete show similar number and type of cracks in flexure.

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Section: Mechanical Properties Of Mixessupporting

confidence: 80%

Section: Mechanical Properties Of Mixesmentioning

confidence: 99%

Short-term mechanical performance and flexural behavior of reinforced slag-fly ash-based geopolymer concrete beams in comparison to OPC-based concrete beams

Ojha¹,

Singh²,

Trivedi³

et al. 2022

Res. Eng. Struct. Mater.

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“…The second phenomenon that influences bricks' strength is the reduction in cohesive friction between clay and organic additive particles. The incorporation of almond husk reduced alumina and silica content, making the final matrix less cohesive [40,41]. Nevertheless, an enhancement in strength is obtained at 2 wt.% waste content.…”

Section: Resultsmentioning

confidence: 99%

Viscoelastic Measurements of Clay Suspensions and their Relationship to Strength of Unfired Clay Bricks with Almond Husk Additive

Noureddine

Manssouri

Cherkaoui

et al. 2022

JERA

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Engineered unfired clay bricks are an ecological alternative to overcome conventional construction materials’ inconvenience. This work investigates the rheological behavior of organo-silica suspensions, made from almond husk waste and illite clay, in relation to the compressive strength of unfired clay bricks incorporating the same waste. Selected proportions by weight of almond husk are 2, 5, 10, and 20 wt.%. Results from the compressive strength test show an improvement, of 8.98% in bricks with 2 wt.% waste content compared to the control sample, thanks to an increase in friction and the fiber bridging mechanism. Then, a progressively decrease in strength is recorded with the addition of waste. The decrease in strength is reported to be the creation of pores in the matrix, and loss of cohesion. It is found that the storage modulus, on a logarithmic scale, follows inversely the same trend of the compressive strength in previously prepared bricks. The results from the strength test and rheological test are linearly correlated. Strong coefficients of determination are found; R2=0.9809 (with 40 wt.% water content) and R2=0.9206 (with 50 wt.% water content). The findings from this study demonstrate the possibility of assessment and prediction of unfired bricks’ strength using rheometry.

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“…Most commonly, ceramic waste is landfilled and considered a solid waste material. Nonetheless, recent studies (e.g., [38][39][40]) successfully used this material as a supplement precursor or filler in concrete [41]. In that respect, with a production of approximately 12.6 million square meters annually [42], ceramic powder can be a suitable waste material for further use in geopolymeric binders.…”

Section: Introductionmentioning

confidence: 99%

The Effect of Sodium and Magnesium Sulfate on Physico-Mechanical and Microstructural Properties of Kaolin and Ceramic Powder-Based Geopolymer Mortar

et al. 2022

Self Cite

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Recent trends in reducing the ecological footprint of the construction industry have increased the attention surrounding the use of alternative binding systems. Among the most promising are geopolymer binders, which were found to have the capability to substantially reduce the environmental impact of Portland cement use. However, even the use of this alternative binding system is known to be heavily dependent on the use of industrial byproducts, such as precursors and an alkaline source, produced through an energy intensive process. To address this and provide a greener route for this binding system, this study adopts the use of natural kaolin and raw ceramic powder as the main precursors. The activation process is performed by using solid potassium hydroxide in conjunction with sodium and magnesium sulfate, which are naturally available, to produce geopolymers. To assess the resulting geopolymer samples, 28 mixes are produced and a series of physico-mechanical and microstructural analyses is conducted. The results show that the use of ceramic powder can improve the physico-mechanical properties by reducing porosity. This, however, requires a relatively higher alkalinity for activation and strength development. These findings are further confirmed with the XRD and FTIR results. Nonetheless, the use of ceramic powder with sodium and magnesium sulfate is found to result in a more coherent and homogenous microstructure, compared to the geopolymers produced with potassium hydroxide and kaolin. The findings of this study point to the suitability of using sodium and magnesium sulfate for the cleaner production of kaolin and ceramic powder-based geopolymers.

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The effect of micro-SiO2 and micro-Al2O3 additive on the strength properties of ceramic powder-based geopolymer pastes

Cited by 32 publications

References 97 publications

Short-term mechanical performance and flexural behavior of reinforced slag-fly ash-based geopolymer concrete beams in comparison to OPC-based concrete beams

Short-term mechanical performance and flexural behavior of reinforced slag-fly ash-based geopolymer concrete beams in comparison to OPC-based concrete beams

Viscoelastic Measurements of Clay Suspensions and their Relationship to Strength of Unfired Clay Bricks with Almond Husk Additive

The Effect of Sodium and Magnesium Sulfate on Physico-Mechanical and Microstructural Properties of Kaolin and Ceramic Powder-Based Geopolymer Mortar

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