Performance Modeling of Spherical Capsules during Mixing of Self-Consolidating Concrete

Chidiac, S.E.; Reda, Mouna A.

doi:10.3390/ma16062379

Cited by 3 publications

(3 citation statements)

References 67 publications

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“…To date, much of the work on modelling microcapsule-based self-healing cementitious materials (SHCMs) has focussed on the calculation of the effective properties of the composite using micromechanical models [7] and homogenisation techniques [10]. Further applications of modelling to such materials have included predicting the probability of a crack hitting a microcapsule [11], mechanical self-healing [12], investigations of fracture mechanisms [13], and the survivability of microcapsules during the mixing process [14]. The investigation of fracture mechanisms can aid the design and development of SHCMs utilising microcapsules through the determination of the mechanical properties of the shell and interfacial bond required for rupture.…”

Section: Introductionmentioning

confidence: 99%

Microcapsule Triggering Mechanics in Cementitious Materials: A Modelling and Machine Learning Approach

Ricketts,

de Souza,

Freeman

et al. 2024

Materials

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Self-healing cementitious materials containing microcapsules filled with healing agents can autonomously seal cracks and restore structural integrity. However, optimising the microcapsule mechanical properties to survive concrete mixing whilst still rupturing at the cracked interface to release the healing agent remains challenging. This study develops an integrated numerical modelling and machine learning approach for tailoring acrylate-based microcapsules for triggering within cementitious matrices. Microfluidics is first utilised to produce microcapsules with systematically varied shell thickness, strength, and cement compatibility. The capsules are characterised and simulated using a continuum damage mechanics model that is able to simulate cracking. A parametric study investigates the key microcapsule and interfacial properties governing shell rupture versus matrix failure. The simulation results are used to train an artificial neural network to rapidly predict the triggering behaviour based on capsule properties. The machine learning model produces design curves relating the microcapsule strength, toughness, and interfacial bond to its propensity for fracture. By combining advanced simulations and data science, the framework connects tailored microcapsule properties to their intended performance in complex cementitious environments for more robust self-healing concrete systems.

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Section: Introductionmentioning

confidence: 99%

Microcapsule Triggering Mechanics in Cementitious Materials: A Modelling and Machine Learning Approach

Ricketts,

de Souza,

Freeman

et al. 2024

Materials

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“…The crack has to be 200 µm or smaller [9]. One real-world instance of autonomous healing involves the little release of a therapeutic substance in polymer, glass, ceramic, and ZnO capsules [10][11][12][13].…”

Section: Introductionmentioning

confidence: 99%

Innovative self-healing concrete using polycarboxylate ether: a fused deposition modeling approach with 3D-printed polylactic acid vascular networks

Hameed,

Abdul-Hamead,

Othman

2024

ETJ

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 The 3D vascular to release healing materials at a specified crack  A pre-and post-healing study examined the microstructure of interior fissures  EDX analysis confirmed the consumption of Ca(OH) 2 and the generation of C-S-H  Mechanical properties and durability were restored within 28 days after damage Concrete's fracture susceptibility is due to its limited tensile strength, which can lead to cracks. Steel reinforcement is added to designated areas to address this issue, but minuscule cracks can allow liquids and vapors to infiltrate the reinforcing material, causing corrosion. Self-healing concrete can resist corrosion by mending and sealing minor cracks. This study aims to determine if fused deposition modeling (FDM) can fabricate innovative vascular networks and tubes from polylactic acid (PLA) created by using three-dimensional (3D) printing methods, and its characteristics were contrasted with those of two-and one-dimensional (2D) networks.The dimensions of the internal and exterior diameters were 4 and 5.6 mm, respectively. The researchers used a planetary ball mill to apply an organic polycarboxylate ether liquid and fly ash nanopowder to all vascular architectures. The prefabricated tubes were then incorporated into a concrete beam to enable self-repairing capabilities. The water-to-cement ratio was 0.6%; the mixture was 1 part cement, 2.16 parts water, and 2.98 other ingredients. The self-healing properties were assessed using a four-point bending test. The developed pipes can produce self-healing concrete by introducing nano fly ash particles and low-viscosity healing solutions into the blood vessel network, enabling the concrete to undergo self-repair mechanisms. The specimen that had 3D treatment restored its strength to 95% at flexural recovery.

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“…The crack should have a maximum width of approximately 200 μm or smaller [6]. In autonomous healing, a notable illustration pertains to the controlled release of a stored healing agent through various types of capsules, such as polymer, glass, ceramic, and ZnO capsules [7][8][9][10][11]. Capsule-based self-healing offers limited healing agents, thereby mitigating the need for repetitive damage repair and the restoration of larger cracks [10].…”

Section: Introductionmentioning

confidence: 99%

Integration of FDM and self-healing technology: evaluation of crack sealing by durability and mechanical strength

Hameed,

Othman,

Abdul-Hamead

2023

Mater. Res. Express

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The tensile zone of concrete is prone to cracking due to its limited ability to withstand tension. To address this issue, steel reinforcement is used in these specific regions. The occurrence of little cracks might potentially facilitate the ingress of liquids and gases into the reinforcing material, hence inducing corrosion. Self-healing concrete can repair and seal minuscule cracks, thus impeding the formation of corrosion. This study investigates the potential application of fused deposition modelling (FDM) for generating novel vascular networks and tubes using polylactic acid (PLA) as the material. Poly (lactic acid) (PLA) was fabricated using three-dimensional (3D) printing techniques, and its properties were compared to those of one-dimensional (1D) and two-dimensional (2D) networks. The external diameter measured 5.6 mm, while the internal diameter measured 4 mm. utilized a 10 ml volume to apply healing agents, specifically organic polyethylene glycol liquid and nano-powder (fly ash) derived from recycled materials, to all vascular structures (1D, 2D, and 3D). This application was carried out using a planetary ball mill. Following this, the prepared tubes were incorporated into a concrete beam to introduce self-healing capabilities. The water-to-cement ratio (W/C) utilized for all concrete mixtures was 0.6%, while the definite mixture proportions were 1:2.16:2.98. The quantification of the self-healing phenomenon was conducted by evaluating the restoration of load-carrying capacity following the application of a repaired specimen to a four-point bending test. Furthermore, these enhancements resulted in improved durability, increased compressive strength, and enhanced other physical characteristics. The pipes that are manufactured can be utilized to produce innovative concrete that possesses the ability to undergo self-healing processes, making it well-suited for various self-healing applications.

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Performance Modeling of Spherical Capsules during Mixing of Self-Consolidating Concrete

Cited by 3 publications

References 67 publications

Microcapsule Triggering Mechanics in Cementitious Materials: A Modelling and Machine Learning Approach

Microcapsule Triggering Mechanics in Cementitious Materials: A Modelling and Machine Learning Approach

Innovative self-healing concrete using polycarboxylate ether: a fused deposition modeling approach with 3D-printed polylactic acid vascular networks

Integration of FDM and self-healing technology: evaluation of crack sealing by durability and mechanical strength

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