Fracture Behaviour of Fibre Reinforced Geopolymer Concrete

Kumar, S. Sundar; Pazhani, K. C.; Ravisankar, K.

doi:10.18520/cs/v113/i01/116-122

Cited by 18 publications

(2 citation statements)

References 31 publications

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“…Tao et al [18] pointed out that an increase in steel fiber content will enhance the mechanical properties of geopolymer concrete, such as its strength, modulus of elasticity and ductility. Kumar et al [19] found that steel fibers can effectively delay the expansion of cracks and improve the fracture energy and ductility of the material. Farhan et al [20,21] investigated the mechanical properties of geopolymer concrete reinforced with steel fibers and carried out a uniaxial compressive stress-strain full-curve test, and found that the compressive, tensile and flexural strengths, as well as the post-peak ductility, of the full curve of steel fiber concrete increased with an increase in steel fiber content.…”

Section: Introductionmentioning

confidence: 99%

Mechanical Properties of Fiber-Reinforced Permeable Geopolymer Concrete

Xu,

Liu,

Ding

et al. 2023

Materials

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In this paper, permeable geopolymer concrete with high compressive strength and permeability is prepared using alkali-activated metakaolin as a slurry, and its mechanical properties are reinforced by adding steel fibers. The influencing factors of the strength, porosity and permeability coefficient of the fiber-reinforced permeable geopolymer concrete, as well as its microstructure and curing mechanism, are determined by conducting an unconfined compressive strength test, scanning electron microscopy, energy-dispersive spectroscopy and X-ray diffraction. The test results show that, under the water permeability required to meet the specification conditions, when the alkali activator modulus is 1.4 and the activation-to-solid ratio is 0.9, the effect of metakaolin activation is the most obvious, and the unconfined compressive strength of the permeable geopolymer concrete is the highest. Moreover, the paste formed via the alkali activation of metakaolin contains a large number of silica–oxygen and aluminum–oxygen bonds with a dense and crack-free structure, which enables the paste to tightly combine with the aggregates; the strength of the permeable geopolymer concrete is early strength, and its strength at a curing age of 3 days is the highest. The strength at a curing age of 3 days can reach 43.62% of the 28-day strength; the admixture of steel fiber can effectively improve the strength of the permeable concrete, and with an increase in the amount of admixture, the strength of the fiber shows a trend of increasing, and then decreasing. Under the conditions of this test, a volume of steel fiber of 0.3% enables the optimum unconfined compressive strength to be reached.

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Section: Introductionmentioning

confidence: 99%

Mechanical Properties of Fiber-Reinforced Permeable Geopolymer Concrete

Xu,

Liu,

Ding

et al. 2023

Materials

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“…The application of steel fibres up to 2 % to 3 % by volume significantly increases both flexural behaviour and fracture energy of the AAM composite, which is mainly caused by the high tensile strength and ductility of the fibres [7]. Single fibre pull-out tests are a suitable test method to characterize the bond strength between steel fibres and the surrounding matrix [8].…”

Section: Introductionmentioning

confidence: 99%

Application of Steel Fibres in Alkali-Activated Mortars

Hüsken

Wagner

Gluth

et al. 2020

APP

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Alkali-activated materials are ideal for the repair of concrete structures in harsh environmental conditions due to their high durability in chemically aggressive environments. However, slag-based mortars, in particular, are prone to shrinkage and associated cracks. In this respect, the application of steel fibres is one solution to reduce the formation of shrinkage induced cracks and to improve post cracking behaviour of these mortars. This study investigated the influence of two different types of steel fibres on the tensile properties of two alkali-activated mortars. Direct tensile tests and single fibre pull-outs were performed to analyse the determining failure modes both on macro and micro scale. Mechanical testing was accompanied by non-destructive testing methods such as digital image correlation and acoustic emission for a detailed analysis of the fracture process.

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