3D visualized tracing of rebar corrosion-inhibiting features in concrete with a novel chemical self-healing system

Dong, Biqin; Ding, Weijian; Qin, Shaofeng; Fang, Guohao; Liu, Yuqing; Peng, Dongdong; Han, Shiwen; Xing, Feng; Hong, Shuxian

doi:10.1016/j.conbuildmat.2018.02.094

Cited by 31 publications

(14 citation statements)

References 28 publications

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“…Thus, recent advances in the development of microcapsules for chemical triggering have focused on the investigation of pH‐sensitive shell materials and chloride binding shell and cargo materials to target corrosion‐induced damage (Table ) . In particular, polystyrene and ethyl cellulose have been proposed as shell materials to envelop corrosion inhibiting/passivation agents through a physical extrusion process. Conversely, using a similar mechanical process Xiong et al developed chloride ion–triggered microcapsules functionalizing sodium alginate with Ag + that can bind Cl − ions leading to collapse of the shell and release of the core material …”

Section: Encapsulated Autonomous Self‐healing (Polymers or Minerals)mentioning

confidence: 99%

A Review of Self‐Healing Concrete for Damage Management of Structures

Belie

Gruyaert

Al‐Tabbaa

et al. 2018

Adv Materials Inter

489

278

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The increasing concern for safety and sustainability of structures is calling for the development of smart self-healing materials and preventive repair methods. The appearance of small cracks (<300 µm in width) in concrete is almost unavoidable, not necessarily causing a risk of collapse for the structure, but surely impairing its functionality, accelerating its degradation, and diminishing its service life and sustainability. This review provides the state-ofthe-art of recent developments of self-healing concrete, covering autogenous or intrinsic healing of traditional concrete followed by stimulated autogenous healing via use of mineral additives, crystalline admixtures or (superabsorbent) polymers, and subsequently autonomous self-healing mechanisms, i.e. via, application of micro-, macro-, or vascular encapsulated polymers, minerals, or bacteria. The (stimulated) autogenous mechanisms are generally limited to healing crack widths of about 100-150 µm. In contrast, most autonomous self-healing mechanisms can heal cracks of 300 µm, even sometimes up to more than 1 mm, and usually act faster. After explaining the basic concept for each self-healing technique, the most recent advances are collected, explaining the progress and current limitations, to provide insights toward the future developments. This review addresses the research needs required to remove hindrances that limit market penetration of self-healing concrete technologies.

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Section: Encapsulated Autonomous Self‐healing (Polymers or Minerals)mentioning

confidence: 99%

A Review of Self‐Healing Concrete for Damage Management of Structures

Belie

Gruyaert

Al‐Tabbaa

et al. 2018

Adv Materials Inter

489

278

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show abstract

“…After segmentation, the volume of each steel rebar at the time of testing was quantified through pixel and voxel statistics according to Dong et al [15]. The volume loss due to corrosion was determined as the percentage difference between the initial volume and the volume at the time of testing according to (1):…”

Section: Volume Loss Quantification and Corrosion Pits Distributionmentioning

confidence: 99%

The influence of defects at the steel/concrete interface for pitting corrosion initiation studied through X-ray Computed Tomography and image analysis

et al. 2019

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Although corrosion of reinforcement is a well-known issue for the construction industry, there are still open questions about some fundamentals of corrosion in reinforced concrete. These points include, among others, which are the most sensitive locations of the steel/concrete interface for pitting corrosion to initiate and to propagate. In this study, X-ray computed tomography (CT-scan) is used to characterize eight 20-years-old reinforced concrete cores naturally deteriorated due to chloride-induced corrosion. The volume loss due to corrosion of the reinforcement was quantified through image analysis of CT-scans. The volume loss of the steel was found to be higher for steel rebars embedded in Portland cement specimens rather than in blended cement specimens. Furthermore, CT-scans revealed that the deepest and most frequent corrosion pits, as well as the consequent highest volume loss of steel, were present at the portion of the reinforcement closer to the outdoor environment and in proximity to air voids at the steel/concrete interface. As a consequence, the highest decrease of structural performance of the rebars would be likely localized at those locations. Therefore, the presence of interfacial air voids should be considered as relevant factor when assessing the risk of corrosion of reinforced concrete structures.

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“…The protection was given to reinforcement by the formation of passive film on its surface; destruction of this passive film promotes corrosion due to ingress of chlorides and gases in the cracks of concrete. [5]. For the underground structures and bridges, crack treatment is very difficult, time consuming and labour expensive.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of Mechanical Parameters of Bacterial Concrete

Durga¹,

Nerella²,

Madduru³

et al. 2019

ACSM

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Conventional concrete is prone to cracking under tensile load, despite its good compressive strength. Recently, biological agents have been applied to heal the cracks in concrete, making concrete structures more serviceable. This paper mainly attempts to evaluate the mechanical properties of bacteria-based self-healing concrete. Two bacteria were selected as the bioagents in concrete, namely, Bacillus subtilis and Bacillus halodurans. The concentration of the bioagents were set to 10 5~1 0 7 cell/mL in water. Then, the two bacteria were applied to cracked concrete to cure the cracks. After curing for several days, the bacteria-based self-healing concrete was subjected to compressive and flexural tests to estimate its mechanical parameters. The results show that the self-healing concretes cured for 14d and 28d had a 7% and 18% higher compressive strength than conventional concrete, respectively; the self-healing concretes cured for 14d and 28d had a 11% and 28% higher flexural strength than the conventional concrete, respectively. Thus, the bioagents could effectively heal the surface cracks on concrete, and make the concrete imperviable.

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3D visualized tracing of rebar corrosion-inhibiting features in concrete with a novel chemical self-healing system

Cited by 31 publications

References 28 publications

A Review of Self‐Healing Concrete for Damage Management of Structures

A Review of Self‐Healing Concrete for Damage Management of Structures

The influence of defects at the steel/concrete interface for pitting corrosion initiation studied through X-ray Computed Tomography and image analysis

Evaluation of Mechanical Parameters of Bacterial Concrete

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