Quantitative evaluation of crack self-healing in cement-based materials by absorption test

Park, Byoungsun; Choi, Young Cheol

doi:10.1016/j.conbuildmat.2018.06.206

Cited by 36 publications

(18 citation statements)

References 34 publications

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“…Under 12 V, the degree of self-healing during the test might be larger because the test duration was almost 14 days (330 h), much longer than the others. According to the test results in [49] and [50], self-healing occurs very early, in less than a week. Undoubtedly, therefore, a short test duration is crucial in evaluating the diffusion coefficient of cracked specimens.…”

Section: Resultsmentioning

confidence: 99%

“…Therefore, SH-A and SH-B have higher self-healing capacity than OPC. SH-A contains a crystalline admixture consisting of Na 2 CO 3 and organic calcium ions impregnated in zeolite, and it is believed that they react with each other to produce CaCO 3 , which fills the space in the crack [7,50]. SH-B incorporates CSA as an expansive admixture and bentonite as a swelling agent, in addition to the crystalline admixture in SH-A.…”

Section: Resultsmentioning

confidence: 99%

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Using the Steady-State Chloride Migration Test to Evaluate the Self-Healing Capacity of Cracked Mortars Containing Crystalline, Expansive, and Swelling Admixtures

et al. 2019

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Interest in self-healing-crack technologies for cement-based materials has been growing, but research into such materials remains in the early stage of development and standardized methods for evaluating healing capacity have not yet been established. Therefore, this study proposes a test method to evaluate the self-healing capacity of cement-based materials in terms of their resistance to chloride penetration. For this purpose, the steady-state chloride migration test has been used to measure the diffusion coefficients of cracked mortar specimens containing crystalline, expansive, and swelling admixtures. The results of the present study show that the time to reach a quasi-steady-state decreased and the diffusion coefficients increased as the potential increased because of the potential drop inside the migration cell and self-healing that occurred during the test. Therefore, use of a high potential is recommended to minimize the test duration, as long as the temperature does not rise too much during the test. Using this test method, the self-healing capacity of the new self-healing technologies can be evaluated, and an index of self-healing capacity is proposed based on the rate of charged chloride ions passing through a crack.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Using the Steady-State Chloride Migration Test to Evaluate the Self-Healing Capacity of Cracked Mortars Containing Crystalline, Expansive, and Swelling Admixtures

et al. 2019

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“…The water absorption test could effectively evaluate the self-healing performance of cementbased materials (Park and Choi, 2018). This test was performed according to UNE-EN 1925 Natural stone test methods.…”

Section: Water Absorption Test By Capillaritymentioning

confidence: 99%

Study of Autogenous Self-Healing in Different Mortar Formulations

Gutiérrez¹,

Ibarra²,

Navarro³

et al. 2020

XV International Conference on Durability of Building Materials and Components. eBook of Proceedings

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Autogenous self-healing of cement-based materials is a topic of current interest. This research evaluates autogenous self-healing in four types of mortars based on Portland Cement, one containing CEM II and the other 3 formulated with CEM I and different additions: fly-ashes; nanosilica and hydraulic lime. The evolution of longitudinal cracks caused by a point load has been evaluated measuring the water absorption by capillarity and studying the evolution of the crack by optical microscopy. Besides the mortar composition, it has been evaluated the effect of the environmental conditions on the crack repair. The different specimens were exposed to three different environments: water immersion, curing chamber at 20 ± 2°C and 95 ± 5% of relative humidity (RH) and the laboratory at 25 ±5°C and 65% ± 5% RH. The results obtained allow us to establish that constant hydration is an essential factor for the development of self-healing mechanism. If the samples are kept in water immersion self-healing occurs no matter the additions of the mortar formulation. Size of the crack is also an important factor to allow self-healing. The product formed during selfhealing to fill the crack is mainly calcium carbonate.

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“…Most studies assessing the self-healing performance of concrete have focused on the recovery of durability through the evaluation of the crack filling ratio and the reduction of penetration [ 25 , 26 ]. The methods usually adopted are chloride permeability test, water permeability test, isothermal calorimetry, crack closing test, etc.…”

Section: Introductionmentioning

confidence: 99%

“…The methods usually adopted are chloride permeability test, water permeability test, isothermal calorimetry, crack closing test, etc. [ 12 , 25 ]. However, as pointed out by Guo and Chidiac [ 27 ], self-healing of concrete is made up of two concurrent concepts: self-sealing of cracks, which requires plugging of openings for durability, and self-healing of cracks, which refers to recovery of mechanical properties for strength.…”

Section: Introductionmentioning

confidence: 99%

Effect of Clinker Binder and Aggregates on Autogenous Healing in Post-Crack Flexural Behavior of Concrete Members

et al. 2020

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Crack healing has been studied extensively to protect reinforced concrete structures from the ingress of harmful ions. Research examining the regain in the mechanical properties of self-healing composites has focused mostly on the computation of the healing ratio based on the measurement of the tensile and compressive strengths but with poor regard for the flexural performance. However, the regain in the flexural performance should also be investigated for design purposes. The present study performs flexural testing on reinforced concrete members using crushed clinker binder and aggregates as well as crystalline admixtures as healing agents. Healing ratios of 100% for crack widths smaller than 200 μm and 85% to 90% for crack widths of 250 μm were observed according to the admixing of clinker binder and aggregates. Water flow test showed that the members replacing binder by 100% of clinker achieved the best crack healing performance. The crack healing property of concrete improved to some extent the rebar yield load, the members’ ultimate load and energy absorption capacity and ductility index. The crack distribution density from the observed crack patterns confirmed the crack healing effect provided by clinker powder. The fine grain size of clinker made it possible to replace fine aggregates and longer healing time increased the crack healing effect.

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Quantitative evaluation of crack self-healing in cement-based materials by absorption test

Cited by 36 publications

References 34 publications

Using the Steady-State Chloride Migration Test to Evaluate the Self-Healing Capacity of Cracked Mortars Containing Crystalline, Expansive, and Swelling Admixtures

Using the Steady-State Chloride Migration Test to Evaluate the Self-Healing Capacity of Cracked Mortars Containing Crystalline, Expansive, and Swelling Admixtures

Study of Autogenous Self-Healing in Different Mortar Formulations

Effect of Clinker Binder and Aggregates on Autogenous Healing in Post-Crack Flexural Behavior of Concrete Members

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