Experimental characterization of the self-healing of cracks in an ultra high performance cementitious material: Mechanical tests and acoustic emission analysis

By Sébastien Granger, A. Loukili, Gilles Pijaudier-Cabot, G. Chanvillard. 2007

352 citations recorded by the source corpus.

Self-healing of cracks in an ultra high performance concrete, considered as a model material, is investigated in this paper. An experimental program is carried out in order to quantify the phenomenon, which has been mainly highlighted by means of water permeability tests until now. Mechanical behaviour of self-healed concrete under three points bending, and acoustic emission analysis of the cracking mechanisms are reported. The mechanical tests demonstrate a recovery of the global stiffness, depending on the time of healing, for specimens initially cracked and then self-healed, and a slow improvement of structural strength. The acoustic emission (AE) analysis is performed in order to show that the mechanical response is due to new crystals precipitating in the crack. The microcracking of these products during three points bending tests is highlighted and an energy analysis provides insights about the cracking process of healed concrete, including damage of the newly formed crystals and continuation of the crack propagation.

Subfields: Civil and Structural Engineering, Mechanics of Materials

View Paper: https://www.semanticscholar.org/paper/41525e7dbf347d32956ef541ce09888931967e01

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In Civil and Structural Engineering

In Mechanics of Materials

Citations in the corpus

Characterization and quantification of self-healing behaviors of microcracks due to further hydration in cement paste (2013, methodology): “cementitious materials by means of mechanical tests and acoustic emission analysis [11].”
Fracture examination in concrete through combined digital image correlation and acoustic emission techniques (2014, methodology): “Both methods are used in literature to calculate the width of FPZ [37,1,2].”
Smart concretes and structures: A review (2015, background): “The mechanical response is due to new crystals precipitating in the crack (Granger et al., 2007).”
Self-Healing in Cementitious Materials—A Review (2013, background): “One of the most widely studied mechanisms of intrinsic crack healing in cementitious materials is autogenous healing [9–24].”
Investigating mechanical properties and self-healing behavior of micro-cracked ECC with different volume of fly ash (2014, background): “Experimental investigation and practical experience have demonstrated [6–9] that the healing of cracks in cementitious materials leads to a gradual reduction of permeability over time for water flowing under a hydraulic gradient.”
Influence of paste volume on shrinkage cracking and fracture properties of self-compacting concrete (2007, methodology): “The statistical error of location is about ±5 mm, which is calculated from conventional Hsu Nielsen simulations (used in [15]).”
Investigation of different fracture modes in cement-based materials by acoustic emission (2013, methodology): “Apart from damage, AE parameters have also been used to highlight other processes like self-healing in concrete [18,19], melting of particles in a matrix [20] or correlating with strength and particle/inclusion size [11,21].”