Self-healing concrete

Huang, Xiang‐Zhong; Kaewunruen, Sakdirat

doi:10.1016/b978-0-12-818961-0.00027-2

Cited by 11 publications

(7 citation statements)

References 30 publications

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“…In general, there is a decrease in pulse velocity from the baseline once the voltage is applied. This is agreeable and is expected as the accelerated corrosion might have induced microcracking [9].…”

Section: Ultrasonic Pulse Velocity (Upv)supporting

confidence: 85%

“…In addition, the non-destructive testing (NDT) methods, which have the standard values established for traditional concrete systems are out of range or not applicable to the self-healing systems. One can make a comparative assessment of self-healing systems but not comply with the standards [9]. In such cases, there is a chance of misinterpretation of data due to a lack of experience with such concretes and need further investigation to establish the range of test values.…”

Section: Introductionmentioning

confidence: 99%

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Large-Scale Laboratory Trials of Self-Healing Technologies

et al. 2023

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Prolonging the life of the reinforced concrete structure is the most promising solution to reduce the carbon emissions from concrete. To achieve that, the structure should be protected from crack formation, which acts as an easy pathway for deleterious agents. Self-healing technologies are intended to provide long-term resilience against cracking due to various deterioration processes. Technologies that performed well in small, laboratory-scale studies are taken to the next level to assess their performance on a larger scale and monitored using various NDT equipment. A 1m long beam with a cross-section (140×120 mm) was cast with two rebars – one with a cover depth of 50 mm from the top and another with a cover depth of 20 mm from the bottom. The mix design consists of CEM IIIA (50 OPC: 50 Slag) cement and 30% lightweight aggregate as a replacement for coarse aggregate. At 28 days of curing, the concrete beams are subjected to accelerated corrosion (by applying a voltage to the bottom rebar) to induce internal cracking. Once internal cracking is induced, the beams are subjected to another 28 days under water for healing. The performance of the beams is monitored via ultrasonic pulse velocity and half-cell potential before and after voltage application. This paper shows the preliminary results and the self-healing efficiency and corrosion resistance of these beams are continuously being monitored under severe chloride conditions to predict the long-term performance.

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Section: Ultrasonic Pulse Velocity (Upv)supporting

confidence: 85%

Section: Introductionmentioning

confidence: 99%

Large-Scale Laboratory Trials of Self-Healing Technologies

et al. 2023

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“…Furthermore, Grossegger and Garcia (2019) claim that pressure improves self-healing rate. According to Huang and Kaewunruen (2020), cracks with applied pressure increase the self-healing ability.…”

Section: Resultsmentioning

confidence: 99%

Self-healing performance of a microcapsule-based structure reinforced with pre-strained shape memory alloy wires: 3-D FEM/XFEM modeling

Taheri-Boroujeni

Ashrafi

2023

Journal of Intelligent Material Systems and Structures

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Combination of microcapsules and shape memory alloys (SMAs) is one of the promising self-healing mechanisms. Although there are several parameters which affect the performance of such structures, limited studies are performed on this combined healing mechanism. In this work, we study the performance of such a composite structure using a 3-D finite element and extended finite element model consisting of matrix, glass microcapsule, healing agent, and Ni-Ti SMA wire. After examining the results, the effect of shape memory alloy wires on increasing the maximum fracture stress was observed. Moreover, the effect of radius of shape memory alloy wires, initial crack location, thickness ratio and volume fraction of microcapsules, and interface strength on ultimate fracture stress are investigated. Also, as a key parameter in self-healing performance, the crack opening distance decreased from 5 to 0.008 μm using 0.5% volume fraction of shape memory wires without pre-strain. In the case that the wires have a pre-strain of 1%, this value reaches almost zero and a compressive stress is induced between fracture surfaces which can enhance the healing process and adherence of healing agent.

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“…This deterioration weakens the concrete, compromising the structural integrity of buildings and reducing their lifespan. In the United Kingdom, the maintenance and repair of existing structures accounts for approximately 45% of the annual construction costs (Huang & Kaewunruen, 2020). Furthermore, the expense related to repairing and replacing damaged property in the United States is estimated to exceed $14 billion annually, while Australia expends hundreds of millions of dollars (Song et al, 2021).…”

Section: Introductionmentioning

confidence: 99%

“…The concept of self-healing concrete has emerged as a promising approach that can substantially reduce building maintenance costs by enabling cracks to repair themselves. This becomes especially relevant when attempting to inspect cracks in areas with limited access and accurately assess the structural integrity of largescale buildings (Huang & Kaewunruen, 2020). Selfhealing concrete, also referred to as bio-concrete or bacterial concrete, draws inspiration from biological principles and the capability of living organisms to mend cracks in hardened concrete (Udhaya et al, 2023).…”

Section: Introductionmentioning

confidence: 99%

Bio-Concrete and Beyond: Advancements in Self-Healing Techniques for Durable Infrastructure

Zeaiter,

Jahami,

Khatib

2023

SCCEE

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Concrete is widely used in construction due to its durability and strength. However, structures made of concrete may weaken over time due to a variety of reasons, such as cracks, chemical attack, and environmental factors. This necessitates the development of new techniques to improve the lifespan and sustainability of concrete structures. Bio-concrete and self-healing techniques have emerged as viable approaches to address the challenges of concrete degradation. This literature review aims to provide a comprehensive overview of the advancements made in bio-concrete and self-healing technologies for concrete. The review begins by discussing the fundamental principles of bio-concrete, which is defined as the incorporation of bacteria or other microorganisms into the concrete matrix. These bacteria are capable of producing calcite precipitation, thereby sealing cracks and enhancing the concrete’s self-healing properties. Moreover, the review explores the mechanical and chemical characterization techniques used to assess the performance of bio-concrete as a self-healing concrete. It analyzes the results of various experimental studies and field applications that offer insights into the performance and effectiveness of these technologies under diverse environmental conditions. Overall, this literature review aims to consolidate the current knowledge and advancements in bio-concrete and self-healing technologies. The findings from this review can serve as a valuable resource for researchers, engineers, and practitioners involved in the design, construction, and maintenance of concrete infrastructure. This contribution ultimately promotes the development of more sustainable and durable concrete materials.

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Self-healing concrete

Cited by 11 publications

References 30 publications

Large-Scale Laboratory Trials of Self-Healing Technologies

Large-Scale Laboratory Trials of Self-Healing Technologies

Self-healing performance of a microcapsule-based structure reinforced with pre-strained shape memory alloy wires: 3-D FEM/XFEM modeling

Bio-Concrete and Beyond: Advancements in Self-Healing Techniques for Durable Infrastructure

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