Double edge wedge splitting (DEWS): an indirect tension test to identify post-cracking behaviour of fibre reinforced cementitious composites

Prisco, Marco di; Ferrara, Liberato; Lamperti, Marco

doi:10.1617/s11527-013-0028-2

Cited by 106 publications

(106 citation statements)

References 14 publications

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“…For ordinary Fibre Reinforced Concrete (FRC), double edge notched 150 mm side square specimens were employed and pre-cracked, according to the "Double Edge Wedge Splitting (DEWS)" test methodology [9], up to a crack opening value equal to 0.25mm; specimens were then subjected to different exposure conditions: immersion in tap water, open air exposure and wet/dry cycles (4 days in water and 3 days exposed to open air). After onemonth exposure to the different conditioning environments, specimens were tested again up to or further a crack opening of 0.25mm, and, after that, subjected again to the same exposure conditions for two further months and finally, they were re-tested again and pre-cracked up to further 0.25mm.…”

Section: Experimental Programme: Materials and Methodologymentioning

confidence: 99%

An overview on the research on self-healing concrete at Politecnico di Milano

Ferrara

2017

MATEC Web Conf.

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Abstract. Self-healing cement based materials, by controlling and repairing cracks, could prevent "permeation of driving factors for deterioration", thus extending the structure service life, and even provide partial recovery of engineering properties relevant to the application. The author's group has undertaken a comprehensive investigation focusing on both experimental characterization and numerical modelling of the selfhealing capacity of a broad category of cementitious composites, including high performance cementitious composites reinforced with different kinds of fibres. Both autogenous healing has been considered and self-healing engineered techniques, including the use of pre-saturated natural fibres and of crystalline admixtures. Tailored methodologies have been employed to characterize the healing capacity under different exposure conditions and for different time spans, ranging up to two years. The healing capacity has been quantified by means of suitably defined "healing indices", based on the recovery of mechanical properties correlated to the amount of crack closure, measured by means of optical microscopy. A predictive modelling approach, based on modified micro-plane model, has been formulated. The whole investigation represents a step towards the reliable and consistent incorporation of self-healing concepts and effects into a durability-based design framework for engineering applications made of or retrofitted with self-healing concrete and cementitious composites.

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Section: Experimental Programme: Materials and Methodologymentioning

confidence: 99%

An overview on the research on self-healing concrete at Politecnico di Milano

Ferrara

2017

MATEC Web Conf.

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“…From the slabs, once hardened, beam specimens 100 mm wide and 500 mm long were cut to be tested in 4-point bending, according to the schematic also shown in Figure 1. The beam specimens were cut from the slabs so that their axis, and hence the direction of the principal tensile stresses due to the bending action to be applied during the tests, was either parallel or perpendicular to the flow direction of the fresh concrete, along which the fibres are aligned [23,[25][26][27][28][29].…”

Section: Experimental Programmementioning

confidence: 99%

“…On the other hand, the value of pre-cracking COD in the post-peak regime has been selected on the basis of an equivalent opening of the unstable localized crack, in analogy to the deflection softening/single cracking case [23,27].…”

Section: Experimental Programmementioning

confidence: 99%

Effects of autogenous healing on the recovery of mechanical performance of High Performance Fibre Reinforced Cementitious Composites (HPFRCCs): Part 1

Ferrara

Krelani

Moretti

et al. 2017

Cement and Concrete Composites

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This paper presents the results are shown of a thorough characterization of the selfhealing capacity of High Performance Fibre Reinforced Cementitious Composites (HPFRCCs). The capacity of the material will be investigated to completely or partially re-seal the cracks, as a function of its composition, maximum crack width and exposure conditions. The analysis will also consider different flow-induced alignments of fibres, which can result into either strain-hardening or softening behaviour, whether the material is stressed parallel or perpendicularly to the fibres, respectively. Beam specimens, initially pre-cracked in 4-point bending up to different values of crack opening, were submitted to different exposure conditions, including water immersion, exposure to humid or dry air, and wet-and-dry cycles. After scheduled exposure times, ranging from one month to two years, specimens were tested up to failure according to the same test set-up employed for pre-cracking. Outcomes of the self-healing phenomenon, if any, were analyzed in terms of recovery of stiffness, strength and ductility. In a durability-based design framework, self-healing indices quantifying the recovery of mechanical properties were also defined and their significance crosschecked.

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“…The Double-Edge Wedge-Splitting (DEWS) test developed by Di Prisco et al [10] was adopted for quantifying the corresponding tensile strength, and  N,peak refers to the post-cracking peak tensile stress obtained during the DEWS tests. It has been shown [10][11] that  N,peak ≈ f Ut,u , either for strain-hardening and strainsoftening fiber-reinforced composites. …”

Section: Estimate Of the Equivalent Fiber-tomatrix Bond Strengthmentioning

confidence: 99%

Determination of the Tensile Response of UHPFRC Layers Using a Non-Destructive Method for Assessing the Fiber Content and Orientation

Pimentel¹,

Nunes²

2016

Proceedings of the 9th International Conference on Fracture Mechanics of Concrete and Concrete Structures

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A procedure is developed for estimating the representative tensile response of existing thin Ultra-High Performance Fiber-Reinforced cement Composite (UHPFRC) layers. The procedure relies on non-destructive (NDT) measurements and on a previous tensile characterization campaign of the composite material, thereby avoiding the extraction of samples from the real structure. Two reliable indicators of the fiber content and fiber orientation within the UHPFRC layer are derived from the NDT measurements along two orthogonal directions. It is shown that these two indicators can be directly correlated to the parameters of a mechanical model providing the tensile response of the composite. The procedure is applied for the prediction of the peak stress of 36 Double-Edge Wedge Split tests and of the structural behavior of slab strips strengthened with a UHPFRC layer.

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Double edge wedge splitting (DEWS): an indirect tension test to identify post-cracking behaviour of fibre reinforced cementitious composites

Cited by 106 publications

References 14 publications

An overview on the research on self-healing concrete at Politecnico di Milano

An overview on the research on self-healing concrete at Politecnico di Milano

Effects of autogenous healing on the recovery of mechanical performance of High Performance Fibre Reinforced Cementitious Composites (HPFRCCs): Part 1

Determination of the Tensile Response of UHPFRC Layers Using a Non-Destructive Method for Assessing the Fiber Content and Orientation

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