Novel active crack width control technique to reduce the variation on water permeability results for self-healing concrete

Mullem, Tim Van; Gruyaert, Elke; Debbaut, Brenda; Caspeele, Robby; Belie, Nele De

doi:10.1016/j.conbuildmat.2019.01.105

Cited by 63 publications

(54 citation statements)

References 27 publications

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“…The following procedure is based on the method used by Van Mullem et al [27]. In order to perform the water permeability test, prismatic specimens were cast measuring 40 mm × 40 mm × 160 mm.…”

Section: Sample Preparation and Crack Creationmentioning

confidence: 99%

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Evaluation of the Self-Healing Ability of Mortar Mixtures Containing Superabsorbent Polymers and Nanosilica

et al. 2020

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Addition of superabsorbent polymers (SAPs) to cementitious mixtures promotes the self-healing ability of the material. When cracking occurs; SAPs present inside the crack will swell upon contact with water and subsequently release this water to stimulate the further hydration of unhydrated cement particles and the calcium carbonate crystallization. However; the inclusion of SAPs affects the mechanical performance of the cementitious material by the creation of macro-pores as water is retracted from the swollen SAP. To counteract the reduction in strength, part of the cement is replaced by nanosilica. In this research, different mixtures containing either SAPs or nanosilica and a combination of both were made. The samples were subjected to wet–dry cycles simulating external conditions, and the self-healing efficiency was evaluated by means of the evolution in crack width, by optical measurements, and a water permeability test. In samples containing SAPs, an immediate sealing effect was observed and visual crack closure was noticed. The smaller influence on the mechanical properties and the good healing characteristics in mixtures containing both nanosilica and SAPs are promising as a future material for use in building applications.

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Section: Sample Preparation and Crack Creationmentioning

confidence: 99%

“…The set-up of the water permeability test is identical to the one proposed by Van Mullem et al [27], also used in the FP7 project HEALCON [10], referred to as the 'water flow setup', and is depicted in Figure 2. A connection is made between the tube and a water reservoir holding a water head at a height of approximately 50 cm.…”

Section: Permeability Testmentioning

confidence: 99%

Evaluation of the Self-Healing Ability of Mortar Mixtures Containing Superabsorbent Polymers and Nanosilica

et al. 2020

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“…Subsequently, a water flow test was used to test the permeability. This method of controlling the crack width actively before performing a water flow test has already been used previously [12,13]. From the results of the water flow test it was possible to calculate different sealing efficiencies.…”

Section: Water Permeabilitymentioning

confidence: 99%

“…The variability on these results is often large, partly due to the variability of the crack width between different specimens. To reduce the variability of the crack width, cracked specimens were manufactured using an active crack width control technique [12]. For chloride ingress, a distinction is made between specimens which were cracked and healed prior to chloride diffusion and specimens which were cracked and were not healed.…”

Section: Introductionmentioning

confidence: 99%

The influence of SAPs on chloride ingress in cracked concrete

2019

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Super Absorbent Polymers (SAPs) have proven to be effective as a self-healing agent for regaining the liquid tightness of cracked concrete. This is due to their large swelling capacity which allows them to (partially) block cracks which are in contact with water or moisture. Additionally, they are able to release this water when the climate becomes drier, thereby promoting the autogenous healing capacity of the concrete matrix. The effect SAPs have on chloride migration into cracked concrete is still unknown. The swelling capacity of the SAPs might partially block the crack, but this does not necessarily mean that the chloride ingress into the crack is lower. Especially, since the porosity of concrete with SAPs is slightly higher when additional water is added to compensate for the loss in workability. This paper compares the chloride ingress in cracked mortar with and without SAPs. The specimens were saturated in a chloride solution during 1 or 5 weeks after which the chloride ingress could be visualised using silver nitrate. The specimens which healed prior to chloride saturation had a significantly lower chloride ingress. The SAPs were able to delay the chloride ingress, as well as limit the influence of the crack on the chloride ingress.

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“…First, the polyurethane reaction does not depend on the mortar fraction and the aggregate-cement ratio, hence it is easier to evaluate its effect in a more homogenous matrix as the one offered by mortar. In addition to the fact that mortar is more homogenous than concrete, the main reason for its use is the possibility to do a fast and cost-effective screening of different self-healing techniques before upscaling for the use in concrete [39]. For this reason, mortar is widely used in the literature on self-healing cementitious materials and consequently using it allows comparability with other techniques and testing methods.…”

Section: Introductionmentioning

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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Novel active crack width control technique to reduce the variation on water permeability results for self-healing concrete

Cited by 63 publications

References 27 publications

Evaluation of the Self-Healing Ability of Mortar Mixtures Containing Superabsorbent Polymers and Nanosilica

Evaluation of the Self-Healing Ability of Mortar Mixtures Containing Superabsorbent Polymers and Nanosilica

The influence of SAPs on chloride ingress in cracked concrete

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

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