First UK field application and performance of microcapsule-based self-healing concrete

Al‐Tabbaa, Abir; Litina, Chrysoula; Giannaros, Petros; Souza, Lívia Ribeiro de

doi:10.1016/j.conbuildmat.2019.02.178

Cited by 154 publications

(73 citation statements)

References 24 publications

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“…PU and PUrea shells allow the inclusion of aqueous compounds which has great potential in delivering inorganic salts and minerals [23][24][25][26]. The promising results in those studies, both in terms of the rupture of the microcapsules by crack propagation and the release of the sodium silicate and subsequent healing of cracks [27,28] provided the impetus to apply some of the same microcapsules for self-healing in oil well cement systems. In oil well cement applications, there is the added challenge of their survivability in the high temperature environment for which the thermal stability of the shell materials is of primary concern.…”

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Development and Application of Novel Sodium Silicate Microcapsule-Based Self-Healing Oil Well Cement

2020

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A majority of well integrity problems originate from cracks of oil well cement. To address the crack issues, bespoke sodium silicate microcapsules were used in this study for introducing autonomous crack healing ability to oil well cement under high-temperature service conditions at 80 °C. Two types of sodium silicate microcapsule, which differed in their polyurea shell properties, were first evaluated on their suitability for use under the high temperature of 80 °C in the wellbore. Both types of microcapsules showed good thermal stability and survivability during mixing. The microcapsules with a more rigid shell were chosen over microcapsule with a more rubbery shell for further tests on the self-healing efficiency since the former had much less negative effect on the oil well cement strength. It was found that oil well cement itself showed very little healing capability when cured at 80 °C, but the addition of the microcapsules significantly promoted its self-healing performance. After healing for 7 days at 80 °C, the microcapsule-containing cement pastes achieved crack depth reduction up to ~58%, sorptivity coefficient reduction up to ~76%, and flexural strength regain up to ~27%. The microstructure analysis further confirmed the stability of microcapsules and their self-healing reactions upon cracking in the high temperature oil well cement system. These results provide a promising perspective for the development of self-healing microcapsule-based oil well cements.

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Development and Application of Novel Sodium Silicate Microcapsule-Based Self-Healing Oil Well Cement

2020

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“…Although several mechanisms for enhancing the autogenous self-healing capacity of concrete have been investigated under lab conditions only few have been up scaled and applied on demonstrator scale in field trials. Besides the demonstrator projects executed by the Delft research group, as described in this paper, also UK-based research groups participating in the Materials for Life (M4L) research program recently reported on a larger scale outdoors demonstrator project [27,[31][32].…”

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confidence: 99%

“…In that large-scale field trial four different self-healing mechanisms were tested in concrete retaining wall panels of dimensions 1.8 x 1 x 0.15m [27]. The four self-healing agents and mechanisms investigated comprised sodium silicateloaded microcapsules, bacteria-loaded porous aggregates, shape memory polymers and mineral healing agent delivering vascular flow networks [30].…”

Section: Discussionmentioning

confidence: 99%

“…Crack width variations were monitored by ultrasonic pulse velocimetry and optically by camera and microscopy, and permeability quantified by quantification of in situ air permeability [31]. Intermediate results indicate that particularly the sodium silicate-loaded microcapsule based panel show significant crack-width reduction and recovery of permeability [27]. Final results and conclusions on performance of also the other three investigated healing techniques is still pending and currently being monitored under the M4L follow up program 'Resilient Materials for Life (RM4L) program [27,31].…”

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confidence: 99%

“…Constructions in wet environments can specifically benefit from self-healing of cracks [27,28]. Watertight constructions are commonly designed in such a way that only cracks of smaller than 0.1 mm width are allowed to occur as these are expected to self-heal due to autogenous healing capacity of the concrete [3].…”

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Bacteria-based self-healing concrete: evaluation of full scale demonstrator projects

Mors¹,

Jonkers

2020

RILEM Tech Lett

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Bacteria-based self-healing concrete is an innovative concrete that contains a self-healing agent that provides the material with enhanced autonomous crack-sealing performance. A specific type of this concrete, based on a healing agent composed of bacterial spores and lactate as carbon source, has been developed and applied by the Delft University of Technology for over ten years. Under laboratory conditions it was proven that, depending on the dosage of healing agent, self-healing of cracks up to 0.8 mm widths occurs. As such the material potentially allows reduction of steel reinforcement used for crack width limitation in watertight constructions. Application of self-healing concrete would therefore not only result in a reduction of costs but also in improvement of environmental performance (lower CO2 footprint) and ease of in situ casting due to reduction of use of steel in waterproof applications. However, according to the EN 1990 Eurocode (Basis of structural design), customary application of a novel type of concrete must be preceded by full scale demonstrators proving evidence for safe and functional performance. In this contribution we portray full scale application of bacteria-based self-healing agent as developed by the Delft research group in two repair mortar-and in two concrete construction demonstrator projects. These demonstrator projects show that addition of the bacteria-based self-healing agent to the concrete mix is safe as no negative side effects on construction performance was observed. However, it also proved difficult to find evidence for increased crack-healing performance as cracking in the demonstrator constructions hardly occurred. In further full scale demonstrators we therefore plan to drastically reduce amount of crack width-restraining reinforcement to show crackhealing capacity and potential to save on use of reinforcement steel in watertight concrete constructions.

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Self-Healing Cement-Based Materials: Mechanisms and Assessment

Kanellopoulos

2021

Engineering Materials and Processes

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First UK field application and performance of microcapsule-based self-healing concrete

Cited by 154 publications

References 24 publications

Development and Application of Novel Sodium Silicate Microcapsule-Based Self-Healing Oil Well Cement

Development and Application of Novel Sodium Silicate Microcapsule-Based Self-Healing Oil Well Cement

Bacteria-based self-healing concrete: evaluation of full scale demonstrator projects

Self-Healing Cement-Based Materials: Mechanisms and Assessment

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