Spatial Distribution of Aligned Short Fibers in Cement Composites

Akkaya, Yılmaz; Picka, Jeffrey D.; Shah, Surendra P.

doi:10.1061/(asce)0899-1561(2000)12:3(272)

Cited by 45 publications

(14 citation statements)

References 16 publications

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“…More recently, research has been conducted to determine the orientation and dispersion of fiber reinforcement [1], and to characterize the fracture processes in concrete [11,20]. Using these techniques, various sizes of cracks have been identified, with cracks as fine as 10 gm or as large as a few millimeters, depending on the field of interest [2].…”

Section: Background and Motivationmentioning

confidence: 99%

Characterization of plastic shrinkage cracking in fiber reinforced concrete using image analysis and a modified Weibull function

2003

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Numerous strategies have been advocated to reduce the potential for plastic shrinkage cracking in concrete through mixture proportioning, curing methods, or the use of fiber reinforcement. The effectiveness of each approach must be adequately quantified to determine whether the additional initial cost of each strategy is justified. The majority of current research to characterize plastic shrinkage cracking in concrete relies on manual crack observation and measurement that is typically only performed at select locations. These manual measurements of crack width may provide only limited information and may be subject to operator bias. This paper describes a systematic methodology that uses a semi-automated image analysis approach to accurately quantify the salient features of the plastic shrinkage crack patterns.A restrained slab specimen with a stress riser was used to amplify the potential for plastic shrinkage cracking. The specimens described in this paper were exposed to an accelerated drying environment for the first 6 hours after casting. At an age of 24 hours, the crack was assessed using a series of thirteen gray level images that were acquired along the crack path. Crack contours were extracted from these images using gray level intensity thresholding to create binary images. Subtracting the binary image from a uniformly spaced grid enabled the crack width to be determined at numerous locations. This image analysis technique permits the crack widths to be assessed rapidly at numerous locations without operator bias. The measured crack widths were statistically analyzed using a modified Weibull distribution function. This enabled the crack width distribution to be fully described using only two or three parameters. It is anticipated that this approach can be used to better quantify the effects of short randomly distributed fiber reinforcement on plastic shrinkage crack formation. RESUMF~

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Section: Background and Motivationmentioning

confidence: 99%

Characterization of plastic shrinkage cracking in fiber reinforced concrete using image analysis and a modified Weibull function

2003

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“…It was used previously to assess the morphological characteristics of micro-cracks in concrete [15], detection of micro-cracks [1,16] hydration processes of cement-based slabs [17], orientation of fiber reinforcement [18], and the cracks microstructure [1,4,9,14]. The quantification of cracks in the prepared samples passed through three steps of image analysis: 1) image acquisition and sample of full crack sequences images as shown in Fig.…”

Section: Image Analysis Proceduresmentioning

confidence: 99%

Assessment of shrinkage-induced cracks in restrained and unrestrained cement-based slabs

Ababneh

Al-Rousan

Alhassan

et al. 2017

Construction and Building Materials

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“…However, this information is limited to the mass surface (Lataste et al, 2008). Image analysis has been used to determine the distribution inside the concrete mass (Akkaya et al, 2000;Chermant et al, 2001;Lawler et al, 2003). However, this process can be slow and expensive.…”

Section: Fiber Distribution In the Frcmentioning

confidence: 99%

“…To determine the actual reinforcement available in each direction of the concrete volume, due to the relevance of the distribution and orientation of the fibers in the development of suitable and reliable material properties for structural design, many researchers have studied the distribution of fibers theoretically and/or at the laboratory level, for example, Akkaya et al (2000), Chermant et al (2001), Chung (2001), Lawler et al (2003, Dupont and Vandewalle (2005), Ozyurt (2007), Lataste et al (2008), Lee and Kim (2010), and the comprehensive RILEM TC 162 (2003), among others.…”

Section: Introductionmentioning

confidence: 99%

Distribution of fibers in SFRC segments for tunnel linings

Carmona

Molins

Aguado

et al. 2016

Tunnelling and Underground Space Technology

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This paper presents research results regarding the distribution of steel fibers in concrete used to build precast tunnel segments for Line 9 of the Barcelona Metro. The fiber distribution was studied using the actual fiber contents obtained by means of crushed cores drilled from different points of three full-scale tunnel lining segments. A statistical analysis determined that the fiber content in the ends of segments tend to be greater than in the central zone. In addition, cores with a diameter of 150 mm were found to have a lower scatter in the fiber content than smaller diameter specimens. Finally, based on probabilistic approaches, a minimum of 11 cores is proposed to control the fiber content in FRC segments.

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Spatial Distribution of Aligned Short Fibers in Cement Composites

Cited by 45 publications

References 16 publications

Characterization of plastic shrinkage cracking in fiber reinforced concrete using image analysis and a modified Weibull function

Characterization of plastic shrinkage cracking in fiber reinforced concrete using image analysis and a modified Weibull function

Assessment of shrinkage-induced cracks in restrained and unrestrained cement-based slabs

Distribution of fibers in SFRC segments for tunnel linings

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