Use of silica gel or polyurethane immobilized bacteria for self-healing concrete

Wang, Jianyun; Tittelboom, Kim Van; Belie, Nele De; Verstraete, Willy

doi:10.1016/j.conbuildmat.2011.06.054

Cited by 606 publications

(247 citation statements)

References 19 publications

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“…For example, bacterial cells have been successfully entrapped in the pores of a nylon substrate [16] or microporous polymer [17] to be used in a microbioreactor. Bacteria immobilized in polyurethane [18,19] have been used to repair concrete cracks. Silica gels can also be used to immobilize yeast spores and bacteria [20], where microbes can retain their enzymatic activity, but preserving the long-term viability of whole cells is a formidable challenge [21].…”

Section: Introductionmentioning

confidence: 99%

Fabrication of nanocomposites and hybrid materials using microbial biotemplates

Shi

Ullah

et al. 2017

Adv Compos Hybrid Mater

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Microbes are important part of life that vary in sizes and shapes, diverse surface chemistry and biology, and porous nature of their cell walls. Besides their importance in industrial processes such as fermentation, these serve as biotemplates and provide a biomimetic approach for fabrication of multifarious complex constructs with predefined features, ordered composites and hybrid nanomaterials, microdevices, and micro/nanorobots through various strategies. The template or building blocks for such approaches can be bacterial, algal, and fungal cells or virus particles. Here, we have summarized recent advancements in biofabrication based on live microbes. Using engineering approaches and suitable methods, live microbes can be manipulated as functional Bmicro/nanodevices and -robots^to further perform biological functions such as replication, distribution, motility, formation of colonies, and secretion of metabolites at will. Biofabrication based on microbes provides effective methods to control and manipulate microbes as functional live building blocks to create micro/nanodevices and -robots for biomedical and energy applications.

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Section: Introductionmentioning

confidence: 99%

Fabrication of nanocomposites and hybrid materials using microbial biotemplates

Shi

Ullah

et al. 2017

Adv Compos Hybrid Mater

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“…Bacterial encapsulation has been used to completely regain transport properties in damaged concrete specimens , but the regain in mechanical properties appears minimal (Wang et al 2012). With this approach, the shelf life is determined by how long the bacterial spores are able to remain viable within the concrete matrix.…”

Section: Self-healing Robustness Of Various Approachesmentioning

confidence: 99%

“…These chemicals are chosen to have low viscosity so that the healing agents can leak from the fractured glass tube into the concrete crack to perform the self-healing. As noted above, the healing agent is not limited to chemicals, but could be biological (Wang et al 2012). Evidence of self-healing was based on mechanical reloading of beam elements that show a rebound of stiffness and/or strength Joseph et al 2010;Van Tittelboom et al 2011) and a reduction of permeability coefficient (Van Tittelboom et al 2011).…”

Section: Self-healing Approachesmentioning

confidence: 99%

“…Evidence of selfhealing was based on visual observation of calcium carbonate precipitates on the cracked surfaces after 100 days of immersion in water (Wiktor and Jonkers 2011). Wang et al (2012) immobilized Bacillus sphaericus in silica gel and polyurethane inside 40 mm long glass tubes with 3mm in diameter. Release of the bacteria upon glass tube fracturing caused by a mortar crack allows breaking down of urea into ammonium (NH 4 + ) and carbonate (CO 3 2-).…”

Section: Self-healing Approachesmentioning

confidence: 99%

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Advances in Self-healing Cementitious Materials

2012

ACT

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PrefaceThis special issue is aiming at summarizing recent progress in self-healing cementitious materials and at motivating further development in the relevant research. It took a long time since the efforts to develop self-healing materials working as intelligent materials drew strong attention worldwide in the research communities. Research and development of self-healing performance have been progressing on varieties of materials including metals, non-metals, inorganic and organic materials, and composite materials. Particularly for cement-based materials, based on the background of epoch-making ideas and existing research results, it has become possible to introduce some self-healing functions and their combined mechanisms. These self-healing cementitious materials have potentials to renovate existing structural designs and maintaining schemes and contribute to service life extension and environmental impact reduction. We expect this special issue could support to realize the potential.This special issue was worked out under a strong support of JCI Technical Committee on Self-healing / Repairing Technology in Cement-based Materials (JCI TC-091) chaired by Prof. S. Igarashi, Kanazawa University. This committee's activities included 1) quantitative evaluation of self-healing performance such as water leakage control and loading damage recovery, 2) investigation into self-healing mechanism, and 3) application of non-destructive test to identify self-healing results. Committee members of the TC are listed below.Koichi Maekawa, Editor-in-Chief of ACT TC-091 committee members AbstractReinforced concrete (RC) structures in marine environments are generally affected by harsh marine environmental actions, resulting in early performance degradation mainly due to chloride-induced deterioration. In such conditions, corrosion of rebar progresses rapidly, and also the cross-sectional area of rebar is reduced and consequently structural performance of RC structures will be degraded. In contrast, the surface of concrete structures is often covered with many marine sessile organisms under marine tidal and submerged conditions. These marine sessile organisms have been empirically known to enhance the durability of concrete though the effectiveness is not appropriately evaluated. This paper describes the long-term resistance of concrete with marine sessile organisms to chloride ion penetration in concrete. The effect and its sustainability of marine sessile organisms on chloride ion penetration in concrete were investigated through field exposure tests and laboratory tests. From the test results, the basal membrane, which is a matrix of marine sessile organisms, adheres to concrete strongly on a long-term basis though some gaps between concrete and the basal membrane can be observed. In addition, experimental results and simplified simulation clarified that the attachment of marine sessile organisms can enhance the long-term resistance of concrete to chloride ion penetration.

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“…From the natural process, bones and trees are the best examples that recover and repair their own strength [3]. Structure and shape of the material changes during self-healing which leads to the improvement of service life at low cost and also avoidance of complicated repair for the entire life [4]. To repair the crack, the research on self-healing is based on duration, mechanical strength and recovery property which depend on the structure.…”

Section: Introductionmentioning

confidence: 99%

Self-Healing Ability of High-Strength Fibre-Reinforced Concrete with Fly Ash and Crystalline Admixture

Reddy

Theja²,

Sashidhar

2018

CivileJournal

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The aim of this study is to analyse the self-healing capability of high-strength fibre-reinforced concrete (M70) with fly ash and crystalline admixture (CA) in four types of environmental exposures i.e. Water Immersion (WI), Wet-Dry Cycles (WD), Water contact (WC) and Air Exposure (AE). Specimens for four mixes are cast, one mix containing 1.1% of CA and three mixes with 10%, 20% and 30% partial replacement of cement with fly ash and additions of 1.1% CA. The specimens were pre-cracked at 28 days, in the range of 0.10-0.40 mm and the time set for healing was 42 days. The result shows that all the mixes have considerable amount of closing ability and strength-regaining capability for all exposure conditions. The concrete with 20% fly ash and 1.1% CA has complete crack closing ability and 100% strength-regaining capability for WI and WD cycle conditions. From SEM analysis, it is confirmed that self-healing products are CaCO3 and C-S-H gel.

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Use of silica gel or polyurethane immobilized bacteria for self-healing concrete

Cited by 606 publications

References 19 publications

Fabrication of nanocomposites and hybrid materials using microbial biotemplates

Fabrication of nanocomposites and hybrid materials using microbial biotemplates

Advances in Self-healing Cementitious Materials

Self-Healing Ability of High-Strength Fibre-Reinforced Concrete with Fly Ash and Crystalline Admixture

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