Recent Advances in Intrinsic Self‐Healing Cementitious Materials

Li, Wenting; Dong, Biqin; Yang, Zhiliang; Xu, Jing; Chen, Qing; Li, Haoxin; Xing, Feng; Jiang, Zhengwu

doi:10.1002/adma.201705679

Cited by 225 publications

(83 citation statements)

References 92 publications

(123 reference statements)

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“…Another aim of this study was to determine whether or not the self-healing ability would manifest in the case of inadequate carbon source. Besides, to solve one of the significant challenges into the self-healing mechanism (Mahmoodi and Sadeghian 2019;Mihashi and Nishiwaki 2012;Li et al 2018), the repeatability of selfhealing concrete specimens with the bacteria in lightweight aggregate was evaluated through the compressive strength recovery of the four cracking and healing cycles test.…”

Section: Introductionmentioning

confidence: 99%

A Study on Biomineralization using <i>Bacillus Subtilis</i> Natto for Repeatability of Self-Healing Concrete and Strength Improvement

Huynh

Imamoto

Kiyohara

2019

ACT

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Recent studies in the field of concrete materials show that the early cracking criteria in micro-size can occur as soon as the cement matrix becomes hardened. In many ways, these cracks can become macro-size and opened cracks resulting in significant issues for the durability and appearance of concrete structures as water leakage and corrosion. The technique of self-healing using bacteria has recently received attention for its potential applications. However, the effectiveness and the repeatability of this method over a long period have not been clarified. The information on both the survival and the number of bacteria after healing is limited. This paper aims to improve the self-healing ability and repeatability of concrete when using Bacillus subtilis natto. The experimental studies evaluate the effect of biomineralization with lightweight aggregate as the protecting-carrying vehicle, which can control the release of healing fluid through four cracking-healing cycles. The urease activity and the biomineralization of the bacteria with urea as the main carbon source were assessed and the effect of cracking age on the self-healing capacity, associated with the compressive strength improvement was studied. The results obtained from the optical microscope and SEM/EDS analysis indicated the existence of bacteria CaCO 3 forming in concrete after four healing cycles. During long duration, bacterial concentration in concrete was determined by microscopic counting method. Based on experimental results, the restoration of the compressive strength confirmed the high self-healing ability of concrete when using bacteria in lightweight aggregate.

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Section: Introductionmentioning

confidence: 99%

A Study on Biomineralization using <i>Bacillus Subtilis</i> Natto for Repeatability of Self-Healing Concrete and Strength Improvement

Huynh

Imamoto

Kiyohara

2019

ACT

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“…In recent years, the self‐healing polymer composite has attracted increasing attention, as it is able to solve the aforesaid problem . There are basically two types of self‐healing polymers, i.e., extrinsic and intrinsic materials .…”

Section: Introductionmentioning

confidence: 99%

Synthesis and self‐healing behavior of thermoreversible epoxy resins modified with nitrile butadiene rubber

Liu

Zhao

et al. 2019

Polymer Engineering & Sci

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Cracks may generate in epoxy resins, which can affect the comprehensive property and shorten service life. The problem is expected to be resolved by endowing epoxy resin with self‐healing performance. Herein, a new kind of self‐healing epoxy resin containing both Diels–Alder (DA) bonds and nitrile butadiene rubber (NBR) has been developed. The self‐healing performance and mechanical properties of as‐prepared epoxy resins are investigated by qualitative observation and quantitative measuring. Results reveal that the as‐prepared epoxy resins exhibit excellent self‐healing performance and multiple repair ability, and the self‐healing behavior is based on dual actions of thermal reversibility of DA reaction and thermal movement of molecular chains. Furthermore, the thermoreversible DA bonds contribute much to the recovery of mechanical property, while the incorporated thermoplastic NBR accelerates the whole healing process. The self‐healing efficiency of epoxy resins can be enhanced markedly by introducing thermoplastic NBR. In addition, the self‐healing epoxy resins also exhibit outstanding reprocessing performance, which makes it possible of recycling waste epoxy resin. POLYM. ENG. SCI., 59:1603–1610 2019. © 2019 Society of Plastics Engineers

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“…The disintegration of concrete due to cracking is one of the major culprits endangering the durability, safety and integrity of concrete structures [3]. The crack was formed in the concrete in the initial stages due to heat released in the hydration process.…”

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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Recent Advances in Intrinsic Self‐Healing Cementitious Materials

Cited by 225 publications

References 92 publications

A Study on Biomineralization using <i>Bacillus Subtilis</i> Natto for Repeatability of Self-Healing Concrete and Strength Improvement

A Study on Biomineralization using <i>Bacillus Subtilis</i> Natto for Repeatability of Self-Healing Concrete and Strength Improvement

Synthesis and self‐healing behavior of thermoreversible epoxy resins modified with nitrile butadiene rubber

Evaluation of Mechanical Parameters of Bacterial Concrete

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