scholarly journals Harnessing the therapeutic myco-potential for concrete-crack healing: Prospects and snags

2020 ◽  
Vol 17 (2) ◽  
pp. 117-128
Author(s):  
Rocktotpal Konwarh ◽  
Suresh Babu Palanisamy ◽  
Pavan Kumar Jogi
Keyword(s):  
Contextual Information ◽  
Fungal Species ◽  
Genetically Engineered ◽  
Self Healing ◽  
Crack Healing ◽  
Systematic Screening ◽  
Construction Design ◽  
Concrete Crack ◽  
Resilient Infrastructure ◽  
Large Width

There has been a continual upsurge on research pertaining to bio-based/ microbial healing of cracks in concrete (a pre-requisite component when it comes to construction design). Albeit, the application of bacteria in this realm has been documented widely over the years, howbeit, delving into fungus based self-healing under the deleterious ambience of concrete with oxygen and nutrient limitation, moisture deficit and high alkalinity has captured recent research impetus. In this context, we have tried to mine the current contextual information to gauge whether research on fungal-based self-healing concrete could be worthwhile. Recent systematic screening encompassing the application of genetically engineered strains, attests the profound untapped potential of specific fungal species in assisting sustainable self-healing to ensure resilient infrastructure. Known for their adaptability under a plethora of environmental stress-conditions and architecturally endowed with large surface-active biomass, fungi can display both biomineralization and organomineralization, leading to rapid and profuse precipitation of CaCO3 (a befitting concrete-filler) for prospective sealing of cracks, even of large width, plausibly without any negative trade-off with respect to concrete’s strength. This article is thus compiled to mirror the various prospects, practical hitches and future direction of research in using fungi for concrete crack healing.

scholarly journals Self-Healing of SiC-Al2O3-B4C Ceramic Composites at Low Temperatures

Materials ◽  
2022 ◽  
Vol 15 (2) ◽  
pp. 652
Author(s):  
Baoguo Wang ◽  
Rong Tu ◽  
Yinglong Wei ◽  
Haopeng Cai
Keyword(s):  
Flexural Strength ◽  
Low Temperatures ◽  
Ceramic Composite ◽  
Ceramic Composites ◽  
Self Healing ◽  
Vickers Indentation ◽  
Crack Healing ◽  
Practical Applications ◽  
Plasma Sintering ◽  
Spark Plasma

Self-healing ceramics have been researched at high temperatures, but few have been considered at lower temperatures. In this study, SiC-Al2O3-B4C ceramic composite was compacted by spark plasma sintering (SPS). A Vickers indentation was introduced, and the cracks were healed between 600 °C and 800 °C in air. Cracks could be healed completely in air above 700 °C. The ceramic composite had the best healing performance at 700 °C for 30 min, recovering flexural strength of up to 94.2% of the original. Good crack-healing ability would make this composite highly useful as it could heal defects and flaws autonomously in practical applications. The healing mechanism was also proposed to be the result of the oxidation of B4C.

scholarly journals Tracking capsule activation and crack healing in a microcapsule-based self-healing polymer

2019 ◽  
Vol 9 (1) ◽  
Author(s):  
S. A. McDonald ◽  
S. B. Coban ◽  
N. R. Sottos ◽  
P. J. Withers
Keyword(s):  
Healing Process ◽  
Polymeric Materials ◽  
Time Lapse ◽  
Repair Process ◽  
Three Dimensions ◽  
Crack Plane ◽  
Self Healing ◽  
Crack Healing ◽  
Healing Agent ◽  
First Time

AbstractStructural polymeric materials incorporating a microencapsulated liquid healing agent demonstrate the ability to autonomously heal cracks. Understanding how an advancing crack interacts with the microcapsules is critical to optimizing performance through tailoring the size, distribution and density of these capsules. For the first time, time-lapse synchrotron X-ray phase contrast computed tomography (CT) has been used to observe in three-dimensions (3D) the dynamic process of crack growth, microcapsule rupture and progressive release of solvent into a crack as it propagates and widens, providing unique insights into the activation and repair process. In this epoxy self-healing material, 150 µm diameter microcapsules within 400 µm of the crack plane are found to rupture and contribute to the healing process, their discharge quantified as a function of crack propagation and distance from the crack plane. Significantly, continued release of solvent takes place to repair the crack as it grows and progressively widens.

scholarly journals Crack-Resistance Behavior of an Encapsulated, Healing Agent Embedded Buffer Layer on Self-Healing Thermal Barrier Coatings

Coatings ◽  
2019 ◽  
Vol 9 (6) ◽  
pp. 358
Author(s):  
Dowon Song ◽  
Taeseup Song ◽  
Ungyu Paik ◽  
Guanlin Lyu ◽  
Yeon-Gil Jung ◽  
...  
Keyword(s):  
Thermal Shock ◽  
Thermal Fatigue ◽  
Thermal Barrier ◽  
Self Healing ◽  
Crack Healing ◽  
Indentation Method ◽  
Jet Engine ◽  
Barrier Coating ◽  
Healing Agent ◽  
Microhardness Indentation

In this work, a novel thermal barrier coating (TBC) system is proposed that embeds silicon particles in coating as a crack-healing agent. The healing agent is encapsulated to avoid unintended reactions and premature oxidation. Thermal durability of the developed TBCs is evaluated through cyclic thermal fatigue and jet engine thermal shock tests. Moreover, artificial cracks are introduced into the buffer layer’s cross section using a microhardness indentation method. Then, the indented TBC specimens are subject to heat treatment to investigate their crack-resisting behavior in detail. The TBC specimens with the embedded healing agents exhibit a relatively better thermal fatigue resistance than the conventional TBCs. The encapsulated healing agent protects rapid large crack openings under thermal shock conditions. Different crack-resisting behaviors and mechanisms are proposed depending on the embedding healing agents.

scholarly journals Autogenous self-healing of cement with expansive minerals-I: Impact in early age crack healing

2018 ◽  
Vol 192 ◽  
pp. 768-784 ◽  
Author(s):  
Tanvir Qureshi ◽  
Antonios Kanellopoulos ◽  
Abir Al-Tabbaa
Keyword(s):  
Early Age ◽  
Self Healing ◽  
Crack Healing

Comparing performances of MICP bacterial vegetative cell and microencapsulated bacterial spore methods on concrete crack healing

2021 ◽  
Vol 302 ◽  
pp. 124227
Author(s):  
Jirapa Intarasoontron ◽  
Wiboonluk Pungrasmi ◽  
Peem Nuaklong ◽  
Pitcha Jongvivatsakul ◽  
Suched Likitlersuang
Keyword(s):  
Vegetative Cell ◽  
Bacterial Spore ◽  
Crack Healing ◽  
Concrete Crack

scholarly journals Feasibility and Compatibility of a Biomass Capsule System in Self-Healing Concrete

Materials ◽  
2021 ◽  
Vol 14 (4) ◽  
pp. 958
Author(s):  
Arkabrata Sinha ◽  
Qi Wang ◽  
Jianqiang Wei
Keyword(s):  
Strength Degradation ◽  
Survival Ratio ◽  
Self Healing ◽  
Crack Healing ◽  
Mortar Strength ◽  
Concrete Properties ◽  
Promising Strategy ◽  
Healing Efficiency ◽  
Biomass Component ◽  
Crack Repair

Cracking can facilitate deteriorations of concrete structures via various mechanisms by providing ingress pathways for moisture and aggressive chemicals. In contrast to conventional maintenance methods, self-healing is a promising strategy for achieving automatic crack repair without human intervention. However, in capsule-based self-healing concrete, the dilemma between capsules’ survivability and crack healing efficiency is still an unfathomed challenge. In this study, the feasibility of a novel property-switchable capsule system based on a sustainable biomass component, polylactic acid, is investigated. Capsules with different geometries and dimensions were studied focusing on the compatibility with concrete, including survivability during concrete mixing, influence on mortar and concrete properties, and property evolution of the capsules. The results indicate that the developed elliptical capsules can survive regular concrete mixing with a survival ratio of 95%. In concrete containing 5 vol.% of gravel-level capsules, the compressive strength was decreased by 13.5% after 90 days, while the tensile strength was increased by 4.8%. The incorporation of 2 vol.% of sand-level capsules did not impact the mortar strength. Degradation and switchable properties triggered by the alkaline matrix of cement were observed, revealing the potential of this novel biomass capsule system in achieving both high survivability and self-healing efficiency in concrete.

scholarly journals Crack-healing in cementitious material to improve the durability of structures: Review

2018 ◽  
Vol 250 ◽  
pp. 03005 ◽  
Author(s):  
Hassan Amer Ali Algaifi ◽  
Suhaimi Abu Bakar ◽  
Abdul Rahman Mohd Sam ◽  
Ahmad Razin Zainal Abidin
Keyword(s):  
Crack Width ◽  
Cementitious Materials ◽  
Cementitious Material ◽  
Self Healing ◽  
Crack Healing ◽  
Harmful Substances ◽  
Crack Faces ◽  
Crack Widths ◽  
Long Term Studies

One of the most commonly used materials in the field of construction is concrete. Nevertheless, there are strong inclinations for concrete to form cracks, which would then allow the penetration of both aggressive and harmful substances into the concrete. Subsequently, this will decrease the durability of the affected structures. Thus, the ability for cracks to heal themselves in the affected cementitious materials is in demand to prolong the life of any structure. Autogenous self-healing is one approach to overcome smaller crack widths (macrocracks). Nowadays, crack width-healing is of great importance. Having said that, both polymers and bacteria are the most common approach to enhance autogenous self-healing and bond crack faces. Crack width-healing of up to 0.97 mm was achieved via bacteria-based self-healing. In this paper, the mechanisms of these approaches and their efficiency to heal crack were highlighted. Both bacteria-and polymers-based self-healing are promising techniques for the future. However, long term studies are still required before real applications can be made.

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