Characterisation of cement pastes with innovative self-healing system based in epoxy-amine adhesive

Pérez, Gloria; Gaitero, Juan J.; Erkizia, Edurne; Jimenez, I.; Guerrero, A.

doi:10.1016/j.cemconcomp.2015.03.010

Cited by 65 publications

(19 citation statements)

References 15 publications

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“…Crack closure can also be achieved by addition of extra cement or other additives like fly ash to initial mix design to promote continuing hydration or stimulate a reaction process releasing self-sealing products [50,51]. Self-healing in cementitious materials has also been attempted by incorporating polymers containing healing agents and shape memory materials into cement matrices [52,53].…”

Section: Self-healing Concrete Materialsmentioning

confidence: 99%

Exploits, Advances and Challenges in Characterizing Self-Healing Materials

Obayi¹,

Nnamchi²

2020

Advanced Functional Materials

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Characterization is an indispensable tool for understanding the structure–property-processing relationship in all material classes. However, challenges in self-healing materials characterization arise from the preparation routes, material types, damage mechanism and applications. Here, the discourse surveys the exploits, advances and challenges encountered within various characterization methods that have been exploited to reveal the damage-restoring processes in some material classes, namely metals, polymers, ceramics, concretes and coatings. Since there is no unified characterization procedure for the different classes of materials displaying self-repairing capabilities, the outcome of this discourse contributes to the advancement of knowledge about understanding self-healing testing procedures. An overview of methods, challenges and prospects toward self-healing property standardization at different length scales has been discussed.

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Section: Self-healing Concrete Materialsmentioning

confidence: 99%

Exploits, Advances and Challenges in Characterizing Self-Healing Materials

Obayi¹,

Nnamchi²

2020

Advanced Functional Materials

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“…The composition and the elemental analysis can state something about the usefulness of the different types of bacteria studied. Studying the precipitated healing products with SEM/EDX was applied for crystalline admixtures and geomaterials, for autogenous healing, healing of lime mortars, healing through embedded microcapsules, healing by porous silica or lightweight aggregates as a capsule or carrier for chemical or biological healing agents, SAPs and expansive powder minerals, among others. All these healing techniques result in different products, being formed and/or precipitated.…”

Section: Healing Efficiencymentioning

confidence: 99%

“…TGA can also be used to characterize the obtained healing products . TGA can also be combined with differential scanning calorimetry (DSC) . DSC is a thermo‐analytical technique to study the amount of heat required to increase the temperature of a sample compared to a reference.…”

Section: Healing Efficiencymentioning

confidence: 99%

“…It can be used to measure properties such as fusion and crystallization events and the glass transition temperature of materials, oxidation and other chemical reactions. The phase diagrams can be used to study the formed products upon healing . DSC is mostly preceded by TGA as TGA can determine whether or not a material degrades at certain temperatures.…”

Section: Healing Efficiencymentioning

confidence: 99%

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Validation of Self‐Healing Properties of Construction Materials through Nondestructive and Minimal Invasive Testing

Snoeck

Malm

Cnudde

et al. 2018

Adv Materials Inter

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When studying the self‐healing properties of construction materials, a plethora of destructive and nondestructive testing (NDT) techniques can be used. In this review, the applicability of different nondestructive test methods is discussed in detail. The methods can be categorized whether they are used to study the encapsulation and/or protection mechanism of the healing agent, the sequestered healing agent itself, the distribution of healing agents, the trigger mechanism for healing, the healing efficiency, or healing performance. Based on this categorization, nondestructive techniques found in literature are discussed. In this way, a robust understanding of the different techniques can be used for future research on self‐healing construction materials.

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“…In that first study, the authors measured the pozzolanic activity and the mechanical strength, achieving a compensation of the loss of strength produced by the addition of the microcapsules by their pozzolanic activity. Later, they assessed the self-healing performance by means of capillary absorption, by using the sorptivity index (Perez et al, 2015), and afterwards in ultra-high performance concrete with CAP, showing that the absorption rate was smaller in the mixes with the microcapsules (García-Calvo et al, 2017;Pérez et al, 2017).…”

Section: Microcapsulesmentioning

confidence: 99%

Self-healing concrete: efficiency evaluation and enhancement with crystalline admixtures

Roig-Flores¹

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Self-healing materials are materials with the capability to repair their damage autogenously or with minimal help from an external stimulus. In the construction field, the development of self-healing elements will increase the durability of structures and reduce their maintenance and repair actions. Reinforced concrete elements frequently suffer small cracks (< 0.3 mm) due to the low tensile strength of concrete. These cracks are not relevant from the mechanical point of view, but they can be an entrance point for aggressive agents that could initiate degradation processes in the element. Concrete has a natural self-healing capability able to seal small cracks, named autogenous healing, that is mainly produced by the continuing hydration and carbonation processes. However, this self-healing capability is limited and therefore it is typically disregarded in the design of concrete structures. Recent studies have attempted to surpass the limitations of autogenous healing in two ways: developing concrete compositions to improve autogenous healing, or designing specific products to achieve self-healing, also known as autonomous self-healing. The latter selfhealing products include, among others: crystalline admixtures, micro-or macroencapsulated agents, and even the use of calcium carbonate-precipitating bacteria. All these products are in different stages of maturity, and some of them are still in development. First, I would like to thank my supervisor, Professor Pedro Serna for his trust and guidance during these years. Thank you for giving me this opportunity and introducing me into research, for all the invaluable experiences and knowledge, which have made me grow both personally and professionally. Thank you for always pushing me to move forward. This thesis would not have been possible without the work of the students that were part of the self-healing team that worked at the Instituto de Ciencia y Tecnología del Hormigón (ICITECH, UPV): Simone Moscato, Francesco Pirritano and Laura Rubio. I would also like to thank Prof. Liberato Ferrara from Politecnico di Milano for the collaboration and the fruitful discussions during these years. I would also like to acknowledge Mercedes Sánchez from Instituto Eduardo Torroja de Ciencias de la Construcción for the XRD analyses of the crystalline admixtures. This work would not have been possible without the financial support provided by Sika A.G. Thanks also to Sika Spain, Elite Cementos and Lafarge for the supply of the different materials. Thanks to the technicians Paco and Jürgen, for their support in the laboratory but also for all the laughs and our conversations on politics and music. During these years I have shared experiences and laboratory and office work with many people at ICITECH, from which I would like to give special mention to Itziar and Mabel for their sincere support. Thanks to the professors of the research group, especially to Guillermo for the honest comments and the history-politics lessons during coffee breaks.

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Characterisation of cement pastes with innovative self-healing system based in epoxy-amine adhesive

Cited by 65 publications

References 15 publications

Exploits, Advances and Challenges in Characterizing Self-Healing Materials

Exploits, Advances and Challenges in Characterizing Self-Healing Materials

Validation of Self‐Healing Properties of Construction Materials through Nondestructive and Minimal Invasive Testing

Self-healing concrete: efficiency evaluation and enhancement with crystalline admixtures

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