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Article: Constriction size retention criterion for calcium alginate microcapsules in granular materials

TitleConstriction size retention criterion for calcium alginate microcapsules in granular materials
Authors
KeywordsConstriction size
Granular materials
Microcapsules
Porous media
Washout tests
Issue Date20-Oct-2022
PublisherElsevier
Citation
Powder Technology, 2023, v. 413 How to Cite?
Abstract

Microcapsules have demonstrated to self-heal cementitious materials. However, their prospect in granular materials and other porous cemented materials remains to be tested. An initial challenge to tackle is to ensure the microcapsules retention in open, interconnected porous media. The purpose of this study is to investigate the retention of microcapsules in gravel under the influence of seepage. This scheme largely coincides with the intention of geotechnical filters to prevent the excessive washout of base soils. A mathematical model previously designed for cohesionless soil is used to establish an initial retention criterion based on the constriction size distribution of gravel (the minimum pore opening size distribution formed by various gravel packings) and, the particle size distribution of microcapsules (made of calcium alginate/polydimethylsiloxane) and an equivalent control material (glass beads). The proposed model is verified experimentally by washout tests on microcapsules-gravel and glass beads-gravel mixtures. Optical microscopy is used to assess the integrity of microcapsules after testing. The lower washout of microcapsules compared with cohesionless glass beads could be attributed to their adhesive nature. By incorporating the influence of size change of microcapsules during drying, which is an intrinsic property of the microcapsules, a modified empirical equation is presented for soft and adhesive microcapsules, demarcating the boundary between effective and ineffective retention for microcapsules-gravel mixtures.


Persistent Identifierhttp://hdl.handle.net/10722/340467
ISSN
2023 Impact Factor: 4.5
2023 SCImago Journal Rankings: 0.970
ISI Accession Number ID

 

DC FieldValueLanguage
dc.contributor.authorChen, Ke-
dc.contributor.authorQi, Rui-
dc.contributor.authorXing, Xin-
dc.contributor.authorSufian, Adnan-
dc.contributor.authorLourenço, Sérgio DN-
dc.date.accessioned2024-03-11T10:44:51Z-
dc.date.available2024-03-11T10:44:51Z-
dc.date.issued2022-10-20-
dc.identifier.citationPowder Technology, 2023, v. 413-
dc.identifier.issn0032-5910-
dc.identifier.urihttp://hdl.handle.net/10722/340467-
dc.description.abstract<p>Microcapsules have demonstrated to self-heal cementitious materials. However, their prospect in granular materials and other porous cemented materials remains to be tested. An initial challenge to tackle is to ensure the microcapsules retention in open, interconnected porous media. The purpose of this study is to investigate the retention of microcapsules in gravel under the influence of seepage. This scheme largely coincides with the intention of geotechnical filters to prevent the excessive washout of base soils. A mathematical model previously designed for cohesionless soil is used to establish an initial retention criterion based on the constriction size distribution of gravel (the minimum pore opening size distribution formed by various gravel packings) and, the particle size distribution of microcapsules (made of calcium alginate/polydimethylsiloxane) and an equivalent control material (glass beads). The proposed model is verified experimentally by washout tests on microcapsules-gravel and glass beads-gravel mixtures. Optical microscopy is used to assess the integrity of microcapsules after testing. The lower washout of microcapsules compared with cohesionless glass beads could be attributed to their adhesive nature. By incorporating the influence of size change of microcapsules during drying, which is an intrinsic property of the microcapsules, a modified empirical equation is presented for soft and adhesive microcapsules, demarcating the boundary between effective and ineffective retention for microcapsules-gravel mixtures.<br></p>-
dc.languageeng-
dc.publisherElsevier-
dc.relation.ispartofPowder Technology-
dc.subjectConstriction size-
dc.subjectGranular materials-
dc.subjectMicrocapsules-
dc.subjectPorous media-
dc.subjectWashout tests-
dc.titleConstriction size retention criterion for calcium alginate microcapsules in granular materials-
dc.typeArticle-
dc.identifier.doi10.1016/j.powtec.2022.118034-
dc.identifier.scopuseid_2-s2.0-85140884121-
dc.identifier.volume413-
dc.identifier.eissn1873-328X-
dc.identifier.isiWOS:000888930400003-
dc.identifier.issnl0032-5910-

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