Autogenous healing of thin cement based sheets

Hannant, D. J.; Keer, J G

doi:10.1016/0008-8846(83)90035-2

Cited by 45 publications

(28 citation statements)

References 4 publications

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“…Previous researchers have investigated the necessary conditions for autogenous healing in concrete materials. These studies had resulted in identifying three general criteria critical to robust self-healing: the presence of specific chemical species (7,25,26), exposure to various environmental conditions (9,(26)(27)(28) , and small crack width (9,25,29,30). Meanwhile, it was reported that there were several processes including chemical, physical and mechanical interactions as discussed by Kishi et al (31) to be responsible for autogenous healing.…”

Section: Durability Improved By Self-healing Actionmentioning

confidence: 99%

“…The autogenous healing means that cracks/damages can be naturally sealed by the self of concrete, like a bone to heal (5). Such healing of micro-cracks is attributed to rehydration of unhydrated cement particles in concrete matrix (6)(7)(8)(9). For autonomous healing in a composite material self-healing capabilities are achieved by the release of encapsulated repair-agent as a result of cracking from the onset of damage.…”

Section: Introductionmentioning

confidence: 99%

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Overview of recent work on self-healing in cementitious materials

Lv¹,

Chen²

2014

Mater. construcc.

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ABSTRACT:Cracks, especially microcracks, in concrete are of paramount importance to the durability and the service life of cementitious composite. However, the self-healing technology, including autogenous healing and autonomous healing, is expected to be one of effective tools to overcome this boring problem. In this paper, we focus on the autogenous healing of concrete material and a few of recent works of autonomous healing are also mentioned. The durability and the mechanical properties improved by the self-healing phenomenon are reviewed from experimental investigation and practical experience. Several aspects of researches, such as autogenous healing capability of an innovative concrete incorporated geo-materials, self-healing of engineered cementitious composite and fire-damaged concrete, effect of mineral and admixtures on mechanism and efficiency of self-healing concrete are summarized to evaluate the presented progresses in the past several years and to outline the perspective for the further developments. Moreover, a special emphasis is given on the analytical models and computer simulation method of the researches of self-healing in cementitious materials. RESUMEN: Panorámica de trabajos recientes sobre materiales cementantes autorreparables.Las fisuras, y sobre todo las microfisuras, tienen una gran repercusión en la durabilidad y en la vida útil de los materiales cementantes. Ante este problema, la tecnología de la autorreparación, tanto autógena como autónoma, se presenta como una solución eficaz. El artículo se centra en la reparación autógena del hormigón, así como en algunos trabajos recientes sobre la reparación autónoma. Se describen las mejoras de las propiedades de durabilidad y de resistencia que proporciona la técnica del hormigón autorreparable, tanto desde el punto de vista de la investigación experimental como del de la experiencia práctica. A fin de evaluar los avances logrados en los últimos años y de trazar las grandes líneas de desarrollo futuro, se resumen varios de los aspectos investigados: capacidad de reparación de un hormigón innovador que incorpora geomateriales; autorreparabilidad tanto de los compuestos cementantes tecnológicos como de los hormigones que han sufrido daños por incendio; influencia de los aditivos minerales en el mecanismo y eficacia del hormigón autorreparable. Además, se destaca el papel de los modelos analíticos y los métodos de simulación informática en la investigación de los materiales cementantes autorreparables.

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Section: Durability Improved By Self-healing Actionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Overview of recent work on self-healing in cementitious materials

Lv¹,

Chen²

2014

Mater. construcc.

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“…A few investigations were performed in the past on the self-healing capacity of ordinary Fibre Reinforced Concrete (FRC), with different types of fibres and under different exposure conditions, demonstrating the ability of the tested specimens to recover their strength and stiffness, at different levels depending on the aforementioned variables [1,3,[10][11][12]. Interestingly, it was also observed that in the case of higher volume percentages of fibres, the same fibres were able to better promote self-healing in the sense that they constitute a network supporting the formation and increase of crystals between the faces of the cracks.…”

Section: Introductionmentioning

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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“…In the very last decade a huge amount of research work has been dedicated to "engineered" self-healing, along different directions of investigation: self-healing engineered with fibre reinforcement [20][21][22][23][24][25][26][27][28], mineral-producing bacteria [29], super absorbent polymers [30], healing agents contained in shell and tubular capsules [31,32] and other proprietary chemical admixtures [33]. In the latter case, the self-healing action is mainly due to the filling of the crack width, swelling and expansion effects and to improved hydration and re-crystallization.…”

Section: Introductionmentioning

confidence: 99%

Experimental Assessment and Numerical Modeling of Self Healing Capacity of Cement Based Materials via Fracture Mechanics Concepts

Ferrara¹,

Luzio²,

Krelani³

2016

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

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Abstract:The authors' research group has undertaken for about a lustrum a comprehensive research project, focusing on both experimental characterization and numerical predictive modelling of the self-healing capacity of a broad category of cementitious composites, ranging from normal strength concrete to high performance cementitious composites reinforced with different kinds of industrial (steel) and natural fibers. In this paper reference will be made to normal strength concrete: both autogenous healing capacity has been considered and self-healing engineered through the use of crystalline admixtures. A tailored methodology has been employed to characterize the healing capacity of the investigated concrete, based on comparative evaluation of the mechanical performance measured through 3-point bending tests. Tests have been performed to pre-crack the specimens to target values of crack opening, and after scheduled conditioning times to selected exposure conditions, including water immersion and exposure to open air. The healing capacity has been quantified by means of the definition and calculation of suitable "healing indices", based on the recovery of the mechanical properties, including load bearing capacity, stiffness, ductility, toughness etc. and correlated to the amount of crack closure also "estimated" through suitable indirect methodologies. Chemical characterization of the healing products by means of SEM has been performed to understand the different mechanisms governing the observed phenomena and also discriminate among the different amounts of recovery of the different mechanical properties. As a further step a predictive modelling approach, based on modified microplane model, has been formulated. This incorporates the self-healing effects, in particular, the delayed cement hydration, as well as the effects of cracking on the diffusivity and the opposite repairing effect of the self-healing on the micro-plane model constitutive laws. The whole experimental and numerical investigation represents a comprehensive and solid 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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Autogenous healing of thin cement based sheets

Cited by 45 publications

References 4 publications

Overview of recent work on self-healing in cementitious materials

Overview of recent work on self-healing in cementitious materials

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

Experimental Assessment and Numerical Modeling of Self Healing Capacity of Cement Based Materials via Fracture Mechanics Concepts

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