Self-healing recovery and micro-structural properties of slag/fly-ash based engineered cementitious composites under chloride environment and tidal exposure

Zhao, Jun; Li, Weiwen; Liu, Jie; Wang, Zike; Yu, Jing; Wu, Hejun

doi:10.1016/j.cemconcomp.2022.104789

Cited by 21 publications

(3 citation statements)

References 32 publications

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“…Known for their exceptional electrical attributes, CNTs exhibit resistance changes under mechanical stress, enabling micro-damage detection. Simultaneously, the embedded microcapsules within the polymer matrix can release healing agents, rejuvenating the material's integrity upon damage detection [43].…”

Section: Enhanced Damage Detection and Healingmentioning

confidence: 99%

Emerging Trends in Damage Tolerance Assessment: A Review of Smart Materials and Self-Repairable Structures

Firoozi,

Firoozi

2024

SDHM

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The discipline of damage tolerance assessment has experienced significant advancements due to the emergence of smart materials and self-repairable structures. This review offers a comprehensive look into both traditional and innovative methodologies employed in damage tolerance assessment. After a detailed exploration of damage tolerance concepts and their historical progression, the review juxtaposes the proven techniques of damage assessment with the cutting-edge innovations brought about by smart materials and self-repairable structures. The subsequent sections delve into the synergistic integration of smart materials with self-repairable structures, marking a pivotal stride in damage tolerance by establishing an autonomous system for immediate damage identification and self-repair. This holistic approach broadens the applicability of these technologies across diverse sectors yet brings forth unique challenges demanding further innovation and research. Additionally, the review examines future prospects that combine advanced manufacturing processes with data-centric methodologies, amplifying the capabilities of these 'intelligent' structures. The review culminates by highlighting the transformative potential of this union between smart materials and self-repairable structures, promoting a sustainable and efficient engineering paradigm.

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Section: Enhanced Damage Detection and Healingmentioning

confidence: 99%

Emerging Trends in Damage Tolerance Assessment: A Review of Smart Materials and Self-Repairable Structures

Firoozi,

Firoozi

2024

SDHM

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“…Concrete is widely used in construction, but concrete is a brittle material, prone to produce cracks via tensile cracking, which provide a pathway for water and salt ions to erode the infrastructure, leading to the permanent deterioration of structural elements and affecting their service life [ 1 , 2 , 3 ]. Since the ability to control the crack width of concrete is an important indicator of the durability of a structure, enhancing the crack control ability of concrete is essential to improving the durability of the structure.…”

Section: Introductionmentioning

confidence: 99%

Effect of Salt Solution Erosion on Mechanical Properties and Micropore Structure of Recycled Fine Aggregate ECC

Xiang,

Han,

Liu

2024

Materials

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This study examined the impact of sulfate and sulfate–chloride dry–wet cyclic erosion on the mechanical properties and microscopic pore structure of engineered cementitious composite (ECC) with recycled fine aggregate (RA). Uniaxial tensile tests and four-point bending tests were conducted to evaluate the mechanical properties of RAECC, while the resonance frequency ratio was used to assess the integrity of the specimens. Finally, X-ray computed tomography (X-CT) reconstruction was employed to analyze the erosion effects on the microscopic pore structure. The results showed that the uniaxial tensile strength and flexural strength of the RAECC specimens in corrosive solution first increased and then decreased, and the 5% Na2SO4 solution caused the most serious erosion of the specimens. The resonance frequency ratio of the specimens reached the peak value when they were subjected to dry–wet cycles 15 times in the 5% Na2SO4 solution. During the erosion process, the pore space of the specimen first decreased and then increased, and the number of pores increased. The erosion process is the result of the erosion products continuously filling and eventually destroying the pores, and the erosion damage produces a large number of new pores and poor sphericity, leading to a decline in mechanical properties.

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“…The micromechanical model of ECCs is focused on microstructural and microscopic phenomena [5,16]. The damage of cement matrix composites starts from the microscopic scale [17][18][19], where many cracks are generated in the microstructure; stress concentration occurs at the cracks. These small and irregular cracks develop and accumulate rapidly, and when the cracks reach saturation, macroscopic main cracks can be observed; eventually, the main cracks crack completely, leading to the destruction of the material.…”

Section: Introductionmentioning

confidence: 99%

Optimisation of the Mechanical Properties and Mix Proportion of Multiscale-Fibre-Reinforced Engineered Cementitious Composites

Yang,

Wang,

Chen

et al. 2023

Polymers

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Engineered cementitious composites (ECCs) are cement-based composite materials with strain-hardening and multiple-cracking characteristics. ECCs have multiscale defects, including nanoscale hydrated silicate gels, micron-scale capillary pores, and millimetre-scale cracks. By using millimetre-scale polyethylene (PE) fibres, microscale calcium carbonate whiskers (CWs), and nanoscale carbon nanotubes (CNTs) as exo-doped fibres, a multiscale enhancement system was formed, and the effects of multiscale fibres on the mechanical properties of ECCs were tested. The Box-Behnken experimental design method, which is a response surface methodology, was used to construct a quadratic polynomial regression equation to optimise ECC design and provide an optimisation of ECC mix proportions. The results of this study showed that a multiscale reinforcement system consisting of PE fibres, CWs, and CNTs enhanced the mechanical properties of ECCs. CWs had the greatest effect on the compressive strengths of highly ductile-fibre-reinforced cementitious composites, followed by CNTs and PE fibres. PE fibres had the greatest effect on the flexural and tensile strengths of high-ductility fibre-reinforced cementitious composites, followed by CWs and CNTs. The final optimisation results showed that when the ECC matrix was doped with 1.55% PE fibres, 2.17% CWs, and 0.154% CNTs, the compressive strength, flexural strength, and tensile strength of the matrix were optimal.

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Self-healing recovery and micro-structural properties of slag/fly-ash based engineered cementitious composites under chloride environment and tidal exposure

Cited by 21 publications

References 32 publications

Emerging Trends in Damage Tolerance Assessment: A Review of Smart Materials and Self-Repairable Structures

Emerging Trends in Damage Tolerance Assessment: A Review of Smart Materials and Self-Repairable Structures

Effect of Salt Solution Erosion on Mechanical Properties and Micropore Structure of Recycled Fine Aggregate ECC

Optimisation of the Mechanical Properties and Mix Proportion of Multiscale-Fibre-Reinforced Engineered Cementitious Composites

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