Related references
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Article
Materials Science, Multidisciplinary
Jianhang Feng et al.
Summary: A new strategy of fiber modification for enhancing self-healing of concrete is proposed in this study, which involves coating polypropylene fibers with nano calcium carbonate and ethyl cellulose film. The modified fibers accelerate healing product generations by promoting hydration and calcium carbonate precipitation. The closure of 300-500 µm wide cracks is enhanced, leading to 100% recovery of water tightness.
MATERIALS & DESIGN
(2023)
Article
Construction & Building Technology
Bo Wu et al.
CEMENT & CONCRETE COMPOSITES
(2023)
Article
Construction & Building Technology
Qiaomu Zheng et al.
Summary: Secondary hydration is the main driving force for autogenous self-healing, influencing crack closure in damaged cementitious materials. In fiber-reinforced cement composites, secondary hydration also plays a crucial role in regenerating the fiber-matrix interface. Silica fume (SF) addition, as an important factor in cement hydration, significantly affects the self-healing performance of cementitious materials and composites. This study investigated the impact of SF on the autogenous self-healing of ultra-high-performance fiber-reinforced concrete. The addition of >= 20% SF accelerated secondary hydration in the cement matrix surrounding cracks, leading to the dissolution of amorphous silica and the formation of Si-containing healing phases. SF addition also enhanced the regeneration of the fiber-matrix interface by promoting the growth of self-healing products in these areas, contributing to crack closure and restoration of flexural properties.
CEMENT & CONCRETE COMPOSITES
(2023)
Article
Construction & Building Technology
Xianfeng Wang et al.
Summary: This study investigated the effects of microcapsule content, mineral admixture type, mineral admixture content, and fiber type on the properties of fiber-reinforced microcapsule self-healing cementitious composites. The results showed that microcapsule content and fiber type have significant impacts on tensile properties. The energy-based steady-state crack propagation test revealed that the ductility is primarily affected by the fiber type. The scanning electron microscopy/energy dispersive X-ray spectrometry (SEM/EDS) diagram confirmed the healing effect of the fiber-reinforced microcapsule self-healing cementitious composite.
CONSTRUCTION AND BUILDING MATERIALS
(2023)
Article
Environmental Sciences
Yujie Ying et al.
Journal of Cleaner Production
(2023)
Article
Oceanography
Nan Wang et al.
Summary: China has the largest extent of reclamation in the world, which has been utilized for ports, industries, and urban expansion since 2000. Ports are crucial for land-sea coordination and regional development, making the study of port reclamation patterns and environmental strategies essential for coastal zone sustainable development. However, there are challenges such as the need for stricter reclamation policies, ecological demands, and imbalanced spatial-temporal distribution of reclamation activities. Further research in land reclamation is important for regulating port reclamation activities and promoting sustainable development.
OCEAN & COASTAL MANAGEMENT
(2023)
Article
Materials Science, Composites
Mingzhuan Li et al.
Summary: This paper reports a self-healing interface based on reversible hydrogen-bonded interactions in carbon fiber/polyvinyl alcohol composites. The surface functionalization of carbon fiber with dopamine allows for multiple reversible hydrogen bonds between polydopamine and polyvinyl alcohol at the interface. The CF-PDA/PVA composites exhibit significantly improved interfacial bonding force compared to CF/PVA composites, and maintain a relatively high self-healing efficiency after five cycles.
COMPOSITES COMMUNICATIONS
(2023)
Article
Construction & Building Technology
S. Papaioannou et al.
Summary: This paper combines simulation and experimental studies to investigate the healing efficiency of spherical macrocapsules in cement mortars. The simulation used Monte Carlo simulation to explore the potential of capsules to heal cracks of different widths. Experimental results confirmed the beneficial effect of the developed capsules, showing a significant decrease in water permeability and contribution to load regain of the cementitious matrix.
CEMENT & CONCRETE COMPOSITES
(2023)
Article
Construction & Building Technology
Xi Xiao et al.
Summary: This paper presents the development of a new type of functionally graded reactive magnesia cement-based bacteria spores (RMC-B) capsule for self-healing concrete. The capsule is designed with a gradient structure consisting of a dense shell and a porous and low alkaline core to protect and enhance the viability of bacteria spores. The addition of the RMC-B capsules maintains the strength of the matrix and enables self-healing of cracks. The inclusion of these capsules does not negatively affect hydration and fresh properties of the paste, while improving the compressive strength and crack healing performance.
CEMENT & CONCRETE COMPOSITES
(2023)
Article
Mechanics
Xiaoqiang Yan et al.
Summary: This study develops a quasi-static mode II fracture toughness test methodology for pultruded CFRP composites along the fiber direction. A Compliance-Based Beam Method (CBBM) is used for data reduction, which accounts for the effects of the Fracture Process Zone (FPZ). The tests reveal the dependence of fracture behaviors on the pre-crack sizes and the effects of the fracture process zone and damage accumulation development.
ENGINEERING FRACTURE MECHANICS
(2023)
Article
Construction & Building Technology
Booki Chun et al.
Summary: This study investigates the self-healing capacity of ultra-rapid-hardening fiber-reinforced cementitious composites. Different lengths of polyethylene (PE) fibers were incorporated with different volume fractions. The fiber reinforcing index was proportional to the tensile performance, with the length of the PE fiber being more dominant. Specimens with 2% medium-length fibers showed the most appropriate self-healing behavior.
CONSTRUCTION AND BUILDING MATERIALS
(2023)
Article
Construction & Building Technology
S. Papaioannou et al.
Summary: Encapsulated healing agents, made of reactive OPC core and durable shell produced by pan-coating technique, improve the mechanical performance and self-healing efficiency of cement mortar mixtures. Adding sodium silicate enhances survivability of capsules up to 75% during mixing, and incorporating 20% capsules reduces water sorptivity coefficient by 80% after a 28-day healing period.
CONSTRUCTION AND BUILDING MATERIALS
(2022)
Review
Engineering, Multidisciplinary
Mohammad Fahimizadeh et al.
Summary: This article discusses the advances and challenges of non-ureolytic bacterial concrete self-healing studies and highlights the directions for future research, aiming to provide a sustainable and eco-friendly alternative for concrete repair.
Article
Construction & Building Technology
Caihong Xue
Summary: The study showed that self-healing can restore most of the cracks in fiber-reinforced MgO-cement composites exposed to seawater, while having a minor impact on load capacity. Cracks in seawater were healed mainly through the fast precipitation of Mg(OH)(2).
CONSTRUCTION AND BUILDING MATERIALS
(2022)
Article
Construction & Building Technology
Jian Gao et al.
Summary: Traditional mineral agents for self-healing concrete often require a long time to achieve desired repair efficiency. However, a novel type of fast-responsive capsules based on two soluble components can achieve self-healing in a short time by dissolving and precipitating core materials, as well as blocking cracks with the expansion of super absorbent resin.
CEMENT & CONCRETE COMPOSITES
(2022)
Article
Construction & Building Technology
Yanxuan Ma et al.
Summary: The force-chloride ion triggered microcapsules with PbSO4 embedded on the wall material were successfully synthesized. The microcapsules exhibited suitable morphology and showed good performance in the presence of force-chloride ion. The microcapsules were able to survive in the cement mixing process and improve the strength recovery rate of cementitious composites.
CONSTRUCTION AND BUILDING MATERIALS
(2022)
Article
Construction & Building Technology
A. Y. F. Ali et al.
Summary: This study adopted the matrix-crack approach to estimate the fracture toughness of fiber-reinforced concrete (FRC) beams. The results showed that the depth of the notch and the length of the fibers had a significant impact on the fracture toughness. Longer fibers exhibited higher fracture energy, but increasing the fiber length also led to an increase in debonding length, resulting in a decrease in fracture toughness.
CONSTRUCTION AND BUILDING MATERIALS
(2022)
Article
Construction & Building Technology
Prabhath Ranjan Kumar Soda et al.
Summary: In this study, Bacillus megaterium MTCC 8510 was successfully encapsulated in expanded perlite for healing micro cracks in concrete. The addition of 20% of encapsulated perlite in cement mortar improved crack healing but led to a decrease in compressive strength. To mitigate the strength reduction, 5% nano-silica was added, maintaining both healing efficacy and strength.
CONSTRUCTION AND BUILDING MATERIALS
(2022)
Article
Construction & Building Technology
Mingyue Wu et al.
CEMENT & CONCRETE COMPOSITES
(2022)
Article
Construction & Building Technology
Arkabrata Sinha et al.
Summary: This study investigates a lignin-based capsule system with tunable properties in concrete to address the challenge of survivability and release of healing agents in capsule-based self-healing mechanisms for concrete. The results show that the lignin-based capsules have exceptional survivability and can release healing agents effectively, leading to significant improvements in concrete properties and microstructure. The study demonstrates the potential of using lignin-based capsules for self-healing in concrete.
CEMENT & CONCRETE COMPOSITES
(2022)
Article
Construction & Building Technology
Chunyu Zhang et al.
Summary: Cement-based materials are prone to cracks, especially in marine environments. Self-healing techniques are essential to increase the service life of concrete structures. In this study, three types of self-healing granules were designed and prepared, and their characteristics were analyzed. The results showed that the self-healing granules had acceptable water-proofness and were compatible with cement mortar. Additionally, they effectively sealed cracks below 300 μm and produced repair products with a repair rate of 70%-90%.
CONSTRUCTION AND BUILDING MATERIALS
(2022)
Article
Construction & Building Technology
Weiwei Wu et al.
Summary: This paper investigates the flexural static and fatigue performances of high-content hybrid fiber-polymer concrete (HCHFPC) and establishes a fatigue life prediction model. The results show that the microstructure of HCHFPC is more compact and the flexural strength is significantly improved.
CONSTRUCTION AND BUILDING MATERIALS
(2022)
Article
Materials Science, Multidisciplinary
Xingang Wang et al.
Summary: The experimental results show that montmorillonite-modified slow-release type self-healing microcapsules can effectively increase the viscosity of epoxy resin, reduce its sensitivity to temperature, and have a more significant strength healing effect on cement-based materials.
MATERIALS CHEMISTRY AND PHYSICS
(2022)
Article
Construction & Building Technology
Kequan Yu et al.
Summary: By synergistically utilizing crumb rubber and hollow fly ash cenosphere particles, a lightweight high-strength engineered cementitious composite with enhanced self-healing capability was successfully developed, reducing crack width to 50 μm. Despite lower compressive and tensile strengths with the addition of these particles, the tensile strength to self-weight ratio of the composite is twice that of M45 PVA-ECC.
CEMENT & CONCRETE COMPOSITES
(2021)
Article
Construction & Building Technology
Bo-Tao Huang et al.
Summary: This study assesses and models the crack characteristics of Seawater sea-sand Engineered Cementitious Composites (SS-ECC), exploring the influence of sea-sand size, fiber length, and fiber dosage. Proposed methods, including a five-dimensional representation and a probabilistic model, facilitate the design of SS-ECC in marine and coastal structures by considering crack characteristics and mechanical properties comprehensively.
CEMENT AND CONCRETE RESEARCH
(2021)
Article
Construction & Building Technology
Mian Luo et al.
Summary: This study developed artificial functional aggregates with fly ash, silica fume, metakaolin, limestone powder, and sodium carbonate powder to promote the self-healing efficiency of concrete. Experimental results showed that the artificial functional aggregates effectively improved the self-healing capacity of mortar specimens, leading to increased closure ratio of surface crack and better regain of water tightness. The major healing product in the crack was calcite precipitation, with more calcium carbonate precipitations observed in mortars with artificial functional aggregates compared to the control mortar.
CONSTRUCTION AND BUILDING MATERIALS
(2021)
Article
Construction & Building Technology
Heng Zhang et al.
Summary: This paper investigates the use of hydroxyapatite as a healing agent in cement-based materials, using polyacrylamide (PAM) gel microparticles as carriers of phosphate. It demonstrates that the three-dimensional crosslinked structure of PAM can encapsulate phosphate and control the release rate, leading to a reduction in chloride permeability and high healing efficiency for self-healing cement-based materials.
CONSTRUCTION AND BUILDING MATERIALS
(2021)
Article
Construction & Building Technology
Xiang Liu et al.
Summary: High-efficiency self-healing cementitious materials using hydroxyapatites as healing product were described. Supramolecular hydrogels impregnated with phosphate and ammonium ions were designed to close and completely heal cracks up to 1 mm in width. Ammonium ions facilitated the formation and aggregation of healing products which were converted into hydroxyapatites, improving the maximum healable crack width.
CEMENT AND CONCRETE RESEARCH
(2021)
Article
Engineering, Multidisciplinary
Gaozhan Zhang et al.
Summary: This study investigates the influence of pH value on cement hydration products under sulfate attack. Lowering the pH value of sulfate solution promotes the formation of gypsum crystals and inhibits the ettringite formation in cement paste. The research also shows that the reduction of pH value accelerates the transformation reactions of aluminate phases and enhances the silicate polymerization.
COMPOSITES PART B-ENGINEERING
(2021)
Article
Construction & Building Technology
Honglei Chang et al.
Summary: The study found that different mineral admixtures have varying effects on the self-healing performance of cementitious-based materials. It is recommended to come up with a rational and optimized mineral admixture composition based on the feature of every mineral admixture.
CONSTRUCTION AND BUILDING MATERIALS
(2021)
Proceedings Paper
Materials Science, Multidisciplinary
Reem T. Salman et al.
Summary: This study focused on using four polymers to encapsulate and coat Portland cement particles for the production of self-healing cement capsules. Results showed optimized particle size (50-106 μm), density (2.152-2.337 g/cm^3), and shell thickness (2.08-3.2 μm). Capsules prepared from polystyrene were found to be dependable for mixing into building materials for self-healing and repair applications.
MATERIALS TODAY-PROCEEDINGS
(2021)
Review
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Wei Zhang et al.
COMPOSITES PART B-ENGINEERING
(2020)
Article
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Estefania Cuenca et al.
THEORETICAL AND APPLIED FRACTURE MECHANICS
(2020)
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Jianhang Feng et al.
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R. Alghamri et al.
CONSTRUCTION AND BUILDING MATERIALS
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Jishen Qiu et al.
CEMENT AND CONCRETE RESEARCH
(2019)
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JOURNAL OF CLEANER PRODUCTION
(2019)
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Zhengwu Jiang et al.
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(2019)
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Jishen Qiu et al.
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Laibo Li et al.
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Yifeng Ling et al.
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