Micromechanical modelling of strain hardening and tension softening in cementitious composites

Karihaloo, Bhushan Lal; Wang, J.

doi:10.1007/s004660050193

Cited by 13 publications

(8 citation statements)

References 30 publications

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“…Finally, to study the variation of the tangent modulus with increasing applied tension when additional microcracks are formed, it is necessary to postulate a microcrack evolution law. Karihaloo and Wang [17] have postulated the following two-dimensional linear evolution law based on experimental evidence:…”

Section: Pre-peak Strain Hardeningmentioning

confidence: 99%

“…The kernel K v (x,x i ) has an integrable logarithmic singularity at x = x i which can be easily handled by regularisation. The integral equation was solved accurately using Gauss±Legendre quadrature by Karihaloo et al [12,17] After solving r p (x) the crack opening displacement is easily calculated from Equation 5. The influence of bridging stiffness k on the normalised crack opening of a quadrant of a crack in the array is shown in Figure 8.…”

Section: Pre-peak Strain Hardeningmentioning

confidence: 99%

“…evolution law. Karihaloo and Wang [17] have postulated the following two-dimensional linear evolution law based on experimental evidence:…”

Section: Pre-peak Strain Hardeningmentioning

confidence: 99%

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Micromechanics of Fiber-Reinforced Cementitious Composites

Karihaloo¹,

Wang

2000

Adv. Eng. Mater.

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The strain hardening and tension softening response of short fiber‐reinforced cementitious composites under unidirectional tensile/flexural loading is modelled using concepts from fracture and damage mechanics. The tensile strain hardening in these composites is due to the formation of microcracks which are however prevented from coalescing by the bridging action of the fibers. The density of microcracks increases with increasing tensile/flexural loading until it reaches a saturation level at the tensile load carrying capacity of the composite. Thereafter the fibers progressively debond from the elastic matrix and the deformation begins to localise in the eventual fracture plane, first as unconnected cracks and later as a connected through crack subjected to the residual frictional bridging action by the fibers.

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Section: Pre-peak Strain Hardeningmentioning

confidence: 99%

Section: Pre-peak Strain Hardeningmentioning

confidence: 99%

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Micromechanics of Fiber-Reinforced Cementitious Composites

Karihaloo¹,

Wang

2000

Adv. Eng. Mater.

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“…Concrete composites with high initial strengths are another type of the concretes that are used for the structures where the initial strength is needed to rapidly grow [14]. Also, another type of engineering concrete composites with a low specific weight is used for lightweight structures [15]. Furthermore, an eco-friendly engineering concrete composite was made [16].…”

Section: Introductionmentioning

confidence: 99%

Experimental investigation of impact loading effects on rectangular flat panels of fiber self-compacting cementations composite with expanded steel sheet

Hatami

Dalvand

Chegeni

2020

J Braz. Soc. Mech. Sci. Eng.

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Impact loadings essentially differ from static loadings due to a huge amount of the force applied to milliseconds under these loadings. Energy absorption of composites is proper criteria to examine the function against impact loading. Energy absorbers are widely used in the industry. At the same time, due to their unique properties, the use of strong self-compacting composites has been considered by the researchers. High tensile, compressive, and flexural strengths have made these concrete composites more eminent. In a comprehensive experimental work, using four basic mix designs, 64 rectangular composite panels were made with 100 mm 2 of area and 30, 45, 60, and 75 mm thickness and tested by impact loading. Compressive, tensile, and flexural strength tests were performed on all the four max designs. Steel fibers with percentages of 0, 0.25, 0.5, and 0.75 with 25 m of length were used to make the concrete composites. A hammer with 180 kg weight and 7500 J power was used as the impact loading with drop hammer test machine (DH-TM). The specimens were dynamically loaded by drop test from a 60 cm height. The use of steel fibers and expanded sheets in combination with each other significantly increases the energy absorption. Moreover, the initial peak force increases, while crushing length and deformation of the specimens reduce.

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“…Since mid-1960s, substantial progress in the field of FRC has been made possible due to the following advances in cement and concrete industry (Naaman 2007 Substantial progress has also been made in modeling the behavior of FRC (Balaguru and Shah 1992, Bentur and Mindess 1990, Brandt et al 2000, Hannant 1978, and Karihaloo 1997).…”

Section: History and Development Of Hpfrcmentioning

confidence: 99%

Development and Evaluation of High Performance Fiber Reinforced Concrete as a Repairing Material

Roy¹

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Development and Evaluation of High Performance Fiber Reinforced Concrete as a Repairing Material Manish Roy Concrete is the most widely used man-made material in the world and is second only to water in terms of its utilization. Annually, 6 billion tons of concrete is produced in the world and the US consumption of concrete is over 2.5 tons a year per person (SDC Vision 2030-US Concrete Industry). It drives a US$100 billion industry in the United States alone employing over 2 million people. It enjoys huge acceptability over other construction materials across the globe. Though concrete is strong and durable, it does not last forever, especially when exposed to aggressive conditions. Deicing salts, freeze-thaw cycles, high heat, high mechanical loading, seismic events, etc. lead to potential deterioration of the concrete structure. As a consequence, the service life of the structure is reduced. In US, 1 in every 4 bridges is either structurally deficient or functionally obsolete. The nation's crumbling infrastructures and buildings need urgent replacement. The replacement cost of these structures being enormous, there is a pressing need for repairing and rehabilitating these deficient structures. Keeping the above points in mind, the present study focused on developing a high performance fiber reinforced concrete (HPFRC) material with very high strength and improved ductility, which can rehabilitate the structure by repairing it at a fraction of replacement cost required for new construction. laboratory. I would like to thank Diachao Nie and Priyesh Verma for helping me perform the compressive and flexural strength tests. I thank

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Micromechanical modelling of strain hardening and tension softening in cementitious composites

Cited by 13 publications

References 30 publications

Micromechanics of Fiber-Reinforced Cementitious Composites

Micromechanics of Fiber-Reinforced Cementitious Composites

Experimental investigation of impact loading effects on rectangular flat panels of fiber self-compacting cementations composite with expanded steel sheet

Development and Evaluation of High Performance Fiber Reinforced Concrete as a Repairing Material

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