Quantitative evaluation on self-healing capacity of cracked concrete by water permeability test – A review

Hou, Sailong; Li, Kai; Wu, Zemei; Li, Fumin; Shi, Caijun

doi:10.1016/j.cemconcomp.2021.104404

Cited by 40 publications

(9 citation statements)

References 121 publications

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“…In the water permeability test, the specimen was split after 28 d of age, and 0.3 mm silicone sheets were placed on both ends of the specimen to maintain the crack width. After fixing the specimen using a clamp, a water permeability test ( Figure 4 ) was performed at each age according to previous studies [ 11 , 15 , 29 , 30 ].…”

Section: Methodsmentioning

confidence: 99%

Effects of Capsule Type on the Characteristics of Cement Mortars Containing Powder Compacted Capsules

Choi

Bae

et al. 2022

Materials

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Several studies have been reported on self-healing concrete using bacteria, admixtures, and microcapsules. Among these self-healing techniques, encapsulating cement-based materials is advantageous in that large amounts of self-healing material can be contained in a capsule and released at the cracked site for a targeted reaction. This study produced a powder compacted capsule (PCC) using the droplet and blended manufacturing methods to encapsulate cementitious materials. This study refers to the PCCs as droplet-PCC (D-PCC) and blended-PCC (B-PCC) according to the manufacturing method used. The fluidity, compressive strength, carbonation, drying shrinkage, and water permeability of cement mortar with PCCs were evaluated. The test results show that the flow of the mortar sample using D-PCC was slightly higher than that of the mortar using B-PCC. The compressive strength of the mortar sample with B-PCC was generally higher than that of the mortar sample with D-PCC. The compressive strength of the B-PCC2 sample (with 0.2% of B-PCC) was the highest at all curing ages. This may be because the B-PCC fracture load was higher than that of the D-PCC. In addition, more hydrates were observed in the B-PCC sample than in the D-PCC sample. A crack healing effect was observed in the samples with PCC, regardless of the PCC type. The effect was the greatest in the B-PCC6 sample (with 0.6% of B-PCC). The results of this study provide a reference for the PCC type and mix ratio that would yield the best mechanical properties and crack healing effect.

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Section: Methodsmentioning

confidence: 99%

Effects of Capsule Type on the Characteristics of Cement Mortars Containing Powder Compacted Capsules

Choi

Bae

et al. 2022

Materials

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“…Regarding permeability testing methods, some authors propose the use of small concrete disks of 100 mm in diameter by 50 mm in height [5,6], as seen in Figure 2, where the specimen is wedged between two chambers and two rubber seals, allowing a constant water overhead to form on the top chamber while collecting what passes through the specimen's crack in the bottom chamber. The following study by Hou et al [11] emphasises the importance of autogenou healing or adding healing agents into cementitious materials. It reviews and analyses em pirical formulas linking the quantified geometry of a single crack (such as crack widt tortuosity, and surface roughness) to its transmissivity.…”

Section: Water Permeabilitymentioning

confidence: 99%

“…The relationship between cra geometry and sealing ratio is established and discussed, with recommendations provide for the quantitative evaluation of the self-healing capacity of cracked concrete. The following study by Hou et al [11] emphasises the importance of autogenous healing or adding healing agents into cementitious materials. It reviews and analyses empirical formulas linking the quantified geometry of a single crack (such as crack width, tortuosity, and surface roughness) to its transmissivity.…”

Section: Water Permeabilitymentioning

confidence: 99%

Cracking Methods for Testing of Self-Healing Concrete: An Experimental Approach

Medeiros,

Di Sarno

2024

Buildings

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With the advent of new sustainable construction materials, self-healing concrete has been used and tested in the last decade, raising the question of the efficacy of said mechanisms to prevent water permeation after crack formation. Thus, new novel mechanical methodologies have been introduced to induce controlled cracks in concrete specimens to improve the standardisation and effectiveness of permeability tests. This research explores those new mechanical techniques to create consistent and reproducible crack patterns, crucial for assessing the efficacy of self-healing mechanisms in concrete. This study systematically evaluates how different crack configurations influence the self-healing ability of the material. Findings from this research are expected to aid in refining testing protocols and to contribute significantly to the field of material science within civil engineering by demonstrating the potential of self-healing concrete to revolutionise building practices.

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“…Tis is then combined with CO 3 2which is produced by microbial metabolism, and CaCO 3 mineral precipitation is formed. As shown in Figure 10, there are two ways in which microorganisms can metabolise the biological mineral calcium carbonate: microorganisms generate CO 2 during metabolism and CO 2 combines with Ca(OH) 2 in the matrix to form CaCO 3 deposition or microorganisms directly metabolise calcium-containing substances to form CaCO 3 mineral deposits [52,53]. Te resulting CaCO 3 is deposited continuously and cracks in the concrete are repaired.…”

Section: Microcapsule-type Protective Carriermentioning

confidence: 99%

Carriers of Healing Agents in Biological Self-Healing Concrete

Tan

Ding

2023

Advances in Materials Science and Engineering

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Concrete is the most widely used material in civil engineering, but due to its inherent brittleness, the generation of cracks easily occurs. Crack healing is an effective method for restoring the mechanical properties of concrete and improving its durability. Of all the current concrete crack healing methods, microbial-induced calcium carbonate precipitation technology is an incredibly promising crack self-healing strategy that has received widespread attention in the field of concrete crack repair. As the biological self-healing agent has difficulty resisting the high alkali and high calcium environment in concrete, protection is required when it is used in concrete cracks.

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Quantitative evaluation on self-healing capacity of cracked concrete by water permeability test – A review

Cited by 40 publications

References 121 publications

Effects of Capsule Type on the Characteristics of Cement Mortars Containing Powder Compacted Capsules

Effects of Capsule Type on the Characteristics of Cement Mortars Containing Powder Compacted Capsules

Cracking Methods for Testing of Self-Healing Concrete: An Experimental Approach

Carriers of Healing Agents in Biological Self-Healing Concrete

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