Mechanical Behavior of Fiber‐Reinforced Cement‐Based Composites

Shah, Surendra P.; Ouyang, C.

doi:10.1111/j.1151-2916.1991.tb06836.x

Cited by 108 publications

(43 citation statements)

References 80 publications

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“…We use the brittleness number to compare the observed fracture behavior of three-and four-point bend specimens of the same type of concrete. The ratio of two brittleness numbers for these different geometries can be calculated as: (2) where the ratios of fracture energy of concrete in two different loading conditions can be calculated from experimental load-CM OD plots shown earlier and the ratio of k( a 0 ) values is a geometry and load dependent quantity. Table l I is ts the results of the ratio of two brittleness numbers.…”

Section: Discussionmentioning

confidence: 99%

“…The assurance of crack stability is of particular interest in the study of cementitious materials, such as cement paste, mortar and concrete, where process zone shielding has been documented to give rise to R-curve behavior [1][2][3]. Specifically, the process zone phenomena in these materials include crack bridging by unhydrated cement grains in cement paste [4], crack bridging by aggregates [5] and microcracking [6] in concrete.…”

Section: Introductionmentioning

confidence: 99%

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Crack Stability in the Fracture of Cementitious Materials

1994

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The aim of the present study is to investigate the stability of crack propagation in cementitious materials. Tests were conducted on bend specimens in three-point and four-point loading conditions.Three-point bend specimens showed stable crack growth for mortar, normal strength and high strength concrete specimens. Alternatively, four-point bend specimens showed catastrophic failure for mortar and quasi-catastrophic failure for normal strength and high strength concrete specimens. Results will be discussed in relation to brittleness number model and specific microstructural features including the interfacial transition zone between the cement paste and the aggregate and the attendant toughening mechanisms.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Crack Stability in the Fracture of Cementitious Materials

1994

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“…Optical techniques such as speckle pattern interferometry and Moire interferometry have been used to investigate the fracture process zone in concrete and fiber reinforced concrete (Shah and Ouyang 1991). The information from these techniques has been used primarily to evaluate the localization and toughening mechanisms.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of Crack Propagation and Post-cracking Hinge-type Behavior in the Flexural Response of Steel Fiber Reinforced Concrete

Gali

Subramaniam

2017

Int J Concr Struct Mater

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An experimental evaluation of crack propagation and post-cracking behavior in steel fiber reinforced concrete (SFRC) beams, using full-field displacements obtained from the digital image correlation technique is presented. Surface displacements and strains during the fracture test of notched SFRC beams with volume fractions (V f ) of steel fibers equal to 0.5 and 0.75% are analyzed. An analysis procedure for determining the crack opening width over the depth of the beam during crack propagation in the flexure test is presented. The crack opening width is established as a function of the crack tip opening displacement and the residual flexural strength of SFRC beams. The softening in the post-peak load response is associated with the rapid surface crack propagation for small increases in crack tip opening displacement. The load recovery in the flexural response of SFRC is associated with a hinge-type behavior in the beam. For the stress gradient produced by flexure, the hinge is established before load recovery is initiated. The resistance provided by the fibers to the opening of the hinge produces the load recovery in the flexural response.

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“…However, there is still incomplete knowledge on the design/analysis of fiberreinforced concrete structural members. FRC is a cement based composite material reinforced with discrete, usually randomly distributed, fibers [1,2].The analysis of structural sections requires, as a basic prerequisite, the definition of a suitable stress-strain relationship for each material to relate its behaviour to the structural response. Many stress-strain relationships, in tension and in compression, for FRC materials have been proposed in literature by different authors.…”

Section: Introductionmentioning

confidence: 99%