Sealing efficiency of cement-based materials containing extruded cementitious capsules

Anglani, Giovanni; Mullem, Tim Van; Zhu, Xuejiao; Wang, Jianyun; Antonaci, Paola; Belie, Nele De; Tulliani, Jean‐Marc; Tittelboom, Kim Van

doi:10.1016/j.conbuildmat.2020.119039

Cited by 36 publications

(16 citation statements)

References 69 publications

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“…These values are comparable to the average surface coverage of the different labs, although it is noted that the variation is higher for the results reported here. The sealing efficiency measured by Anglani et al [37], using the same permeability setup as is used in the current study, was equal to 79%, respectively 28%, for the specimens with an internally, respectively externally, coated capsule. Lab 1, 2, 4 and 5 obtained a sealing efficiency between 44% and 73% which falls in between these values.…”

Section: Spread Of Healing Agent On the Crack Surface Of Mortar Specisupporting

confidence: 61%

“…Glass macro-capsules are considered to be representative also for other types of brittle capsules, e.g. capsules made from cement paste [24,[36][37][38], ceramic material [39][40][41] or PMMA [42,43]. The length of the capsules varied depending on the type of specimen.…”

Section: Encapsulated Healing Agentmentioning

confidence: 99%

“…It is noted that it is impossible to obtain a perfect surface coverage since the area of the hole (used to induce the water in the permeability test) was taken into account in the total area. Anglani et al [37] studied the same PU healing agent but encapsulated in one cementitious capsule with a larger diameter. These capsules had either an internal or an external epoxy coating to make them moisture-proof.…”

Section: Spread Of Healing Agent On the Crack Surface Of Mortar Specimentioning

confidence: 99%

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Addressing the need for standardization of test methods for self-healing concrete: an inter-laboratory study on concrete with macrocapsules

Mullem

Anglani

Dudek

et al. 2020

Science and Technology of Advanced Materials

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Development and commercialization of self-healing concrete is hampered due to a lack of standardized test methods. Six inter-laboratory testing programs are being executed by the EU COST action SARCOS, each focusing on test methods for a specific self-healing technique. This paper reports on the comparison of tests for mortar and concrete specimens with polyurethane encapsulated in glass macrocapsules. First, the pre-cracking method was analysed: mortar specimens were cracked in a three-point bending test followed by an active crack width control technique to restrain the crack width up to a predefined value, while the concrete specimens were cracked in a three-point bending setup with a displacement-controlled loading system. Microscopic measurements showed that with the application of the active control technique almost all crack widths were within a narrow predefined range. Conversely, for the concrete specimens the variation on the crack width was higher. After pre-cracking, the self-healing effect was characterized via durability tests: the mortar specimens were tested in a water permeability test and the spread of the healing agent on the crack surfaces was determined, while the concrete specimens were subjected to two capillary water absorption tests, executed with a different type of waterproofing applied on the zone around the crack. The quality of the waterproofing was found to be important, as different results were obtained in each absorption test. For the permeability test, 4 out of 6 labs obtained a comparable flow rate for the reference specimens, yet all 6 labs obtained comparable sealing efficiencies, highlighting the potential for further standardization.

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Section: Spread Of Healing Agent On the Crack Surface Of Mortar Specisupporting

confidence: 61%

Section: Encapsulated Healing Agentmentioning

confidence: 99%

Section: Spread Of Healing Agent On the Crack Surface Of Mortar Specimentioning

confidence: 99%

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Addressing the need for standardization of test methods for self-healing concrete: an inter-laboratory study on concrete with macrocapsules

Mullem

Anglani

Dudek

et al. 2020

Science and Technology of Advanced Materials

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“…Cementitious tubular capsules were produced in accordance with previous researches [22,[41][42][43] using a polymer-modified cement paste. The powder compounds of the paste were: First, all solid compounds were manually mixed, while all liquid compounds were separately mixed together with an overhead stirrer (RW 20, IKA, Staufen, Germany).…”

Section: Capsulesmentioning

confidence: 99%

“…In the first manufacturing process, already used in previous works [22,[41][42][43], the fresh cement paste was manually extruded. This allowed to obtain ridged tubes of variable length with a hollow ovoid cross section (external diameter of 10 mm and internal diameter of 7.5 mm).…”

Section: Capsulesmentioning

confidence: 99%

Behaviour of Pre-Cracked Self-Healing Cementitious Materials under Static and Cyclic Loading

2020

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Capsule-based self-healing is increasingly being targeted as an effective way to improve the durability and sustainability of concrete infrastructures through the extension of their service life. Assessing the mechanical and durability behaviour of self-healing materials after damage and subsequent autonomous repair is essential to validate their possible use in real structures. In this study, self-healing mortars containing cementitious tubular capsules with a polyurethanic repairing agent were experimentally investigated. Their mechanical behaviour under both static and cyclic loading was analysed as a function of some factors related to the capsules themselves (production method, waterproof coating configuration, volume of repairing agent stored) or to the specimens (number, size and distribution of the capsules in the specimen). Their mechanical performances were quantified in terms of recovery of load-bearing capacity under static conditions and number of cycles to failure as a function of the peak force under cyclic conditions. Positive results were achieved, with a maximum load recovery index up to more than 40% and number of cycles to failure exceeding 10,000 in most cases, with peak force applied during cyclic loading at least corresponding to 70% of the estimated load-bearing capacity of the healed samples.

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Cementitious Composite Materials with Self-healing Properties Using Integral Waterproofing Admixtures by Mass Crystallization

Toader

Dico

Mircea

2022

The 15th International Conference Interdisciplinarity in Engineering

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Sealing efficiency of cement-based materials containing extruded cementitious capsules

Cited by 36 publications

References 69 publications

Addressing the need for standardization of test methods for self-healing concrete: an inter-laboratory study on concrete with macrocapsules

Addressing the need for standardization of test methods for self-healing concrete: an inter-laboratory study on concrete with macrocapsules

Behaviour of Pre-Cracked Self-Healing Cementitious Materials under Static and Cyclic Loading

Cementitious Composite Materials with Self-healing Properties Using Integral Waterproofing Admixtures by Mass Crystallization

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