Effect of environmental exposure on autogenous self-healing of cracked cement-based materials

Suleiman, Ahmed R.; Nehdi, Moncef L.

doi:10.1016/j.cemconres.2018.05.009

Cited by 99 publications

(49 citation statements)

References 33 publications

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“…The effect of the environmental conditions on self-healing of concrete has been previously reported (Suleiman and Nehdi, 2018). Therefore, cracked specimens of the four mortar formulations were exposed for 60 days to 3 different environments: water immersion at laboratory conditions, curing chamber at 20 ± 2°C and 95 ± 5% of RH and the laboratory at 25 ±5°C and 65% ± 5% RH.…”

Section: Environmental Exposurementioning

confidence: 93%

Study of Autogenous Self-Healing in Different Mortar Formulations

Gutiérrez¹,

Ibarra²,

Navarro³

et al. 2020

XV International Conference on Durability of Building Materials and Components. eBook of Proceedings

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Autogenous self-healing of cement-based materials is a topic of current interest. This research evaluates autogenous self-healing in four types of mortars based on Portland Cement, one containing CEM II and the other 3 formulated with CEM I and different additions: fly-ashes; nanosilica and hydraulic lime. The evolution of longitudinal cracks caused by a point load has been evaluated measuring the water absorption by capillarity and studying the evolution of the crack by optical microscopy. Besides the mortar composition, it has been evaluated the effect of the environmental conditions on the crack repair. The different specimens were exposed to three different environments: water immersion, curing chamber at 20 ± 2°C and 95 ± 5% of relative humidity (RH) and the laboratory at 25 ±5°C and 65% ± 5% RH. The results obtained allow us to establish that constant hydration is an essential factor for the development of self-healing mechanism. If the samples are kept in water immersion self-healing occurs no matter the additions of the mortar formulation. Size of the crack is also an important factor to allow self-healing. The product formed during selfhealing to fill the crack is mainly calcium carbonate.

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Section: Environmental Exposurementioning

confidence: 93%

Study of Autogenous Self-Healing in Different Mortar Formulations

Gutiérrez¹,

Ibarra²,

Navarro³

et al. 2020

XV International Conference on Durability of Building Materials and Components. eBook of Proceedings

View full text Add to dashboard Cite

show abstract

“…Surface cracks induced by thermal and mechanical actions are a long‐standing problem when the cracks further grow and enlarge, and thus leading to surface degradation . Generally, crack self‐healing can dramatically increase the reliability and enhance the lifespan of materials .…”

Section: Self‐healing Of Different Surface Damage Formsmentioning

confidence: 99%

“…Cracks can be repaired by conventional methods by conscious external intervention once they are observed, however, it is difficult to accomplish the repair of cracks that are minor or too deep on the concrete material surface. For solving such problems, several experimental studies have improved the efficiency of self‐healing, such as using agents capable of promoting hydration or carbonation, and incorporating supplementary cementitious materials to further enhance the autogenous self‐healing of concrete . Recently, the self‐healing concrete surface cracks exposed to different environmental curing conditions have been studied.…”

Section: Self‐healing Of Different Surface Damage Formsmentioning

confidence: 99%

Flourishing Self‐Healing Surface Materials: Recent Progresses and Challenges

Tie

Panhwar

Zhao

2020

Adv Materials Inter

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In the past few decades, the self‐healing surface materials with durable mechanical, functional, and structural properties have attracted enormous research interests, which exhibit great potential in energy conversion devices, sensors, electronic skins, superhydrophobic fabrics, medical/biological hydrogel, and a protective coating. Despite the remarkable progresses achieved in the self‐healing surface, the systematic and overall reviews that focus on self‐healing surface materials are still lacking and in urgent need. Herein, the recent advances in the development of self‐healing surface materials are summarized. The surface damage forms that composed of cracks, scratches, punctures, and surface wear, are systematically reviewed. The self‐healing mechanism and methods at interface are then introduced to briefly explain the basic design principle. The recent developments of functional surfaces including superhydrophobic, oleophobic, antifogging, anti‐icing, antibiofouling, and anticorrosion surfaces with self‐healing functions are further discussed. Finally, the contemporary challenges, and the future perspectives that motivate are proposed to create more innovative self‐healing materials for diverse fields.

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“…The hydration process of cement paste is almost completed after a long time, and its permeability would be basically kept stable. However, the permeability of cementitious material might decrease a little when the cement-based material comes into contact with the water again because of the autogenous self-healing capacity, especially for cracked cementitious materials (Huang et al 2016;Suleiman and Nehdi 2018).…”

Section: Prediction Of the Permeability Of Cement Pastementioning

confidence: 99%

Microstructure-Based Modeling for Water Permeability of Hydrating Cement Paste

2019

ACT

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Water permeability is a key property for the serviceability and durability of concrete structures, which governs the transport of fluid through the pore network in the cementitious material. A microstructure-based numerical test method is proposed and employed to predict the permeability of hydrating cement paste. Numerical samples characterizing the evolution of the microstructure of cement paste are generated using the computational code HYMOSTRUC3D. Based on the three-dimensional (3D) finite element method (FEM), the pore-scale flow of water induced by pressure-gradient through the sample is simulated and the corresponding permeability is estimated. Water flow characteristics in the hydrating cement paste and the evolution of the permeability against different water-to-cement ratio (w/c), porosity, curing age and degree of hydration are investigated by numerical simulations. The simulated results are verified in comparison with available theoretical solutions, experimental data and numerical predictions obtained from the literature. Due to the dilution and tortuosity effects, the permeability decreases with the increase of cement hydration and the decrease of w/c. The connectivity of the pore throat plays an important role in affecting water movement in hydrating cement paste. The developed modeling approach is capable to investigate the transport properties of cement paste, which may provide basic parameters for multiscale modeling of concrete performance and strongly support the coupled multiphysics analysis in concrete engineering.

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Effect of environmental exposure on autogenous self-healing of cracked cement-based materials

Cited by 99 publications

References 33 publications

Study of Autogenous Self-Healing in Different Mortar Formulations

Study of Autogenous Self-Healing in Different Mortar Formulations

Flourishing Self‐Healing Surface Materials: Recent Progresses and Challenges

Microstructure-Based Modeling for Water Permeability of Hydrating Cement Paste

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