Evaluating the effects of nanosilica on the material properties of lightweight and ultra-lightweight concrete using image-based approaches

dc.contributor.authorSikora, Pawel
dc.contributor.authorRucinska, Teresa
dc.contributor.authorStephan, Dietmar
dc.contributor.authorChung, Sang-Yeop
dc.contributor.authorElrahman, Mohamed Abd
dc.date.accessioned2021-01-14T11:18:35Z
dc.date.available2021-01-14T11:18:35Z
dc.date.issued2020-07-30
dc.description.abstractThis work is aimed at characterizing the effects of nanosilica (NS) on the properties of lightweight aggregate concretes with different densities. Lightweight aggregate concrete (LWAC) and ultra-lightweight aggregate concrete (ULWAC) with targeted oven-dry densities of 850 kg/m3 and 450 kg/m3, respectively, were produced. The mixtures were modified by replacing cement with nanosilica, in concentrations of 1, 2, 5 and 10 wt-%. For comparison purposes, control specimens containing either cement alone or cement with silica fume (SF) were also produced. Their mechanical properties, including flexural and compressive strengths and transport characteristics, were evaluated by measuring the water accessible porosity and water absorption coefficients of the concretes. In addition, the thermal conductivity and drying shrinkage, being important parameters of lightweight concrete, were characterized. The pore structure characteristics of the concretes were assessed using 2D and 3D image analysis techniques; namely, using an automated air void analyser and micro-computed tomography (micro-CT), respectively. The experimental results show that NS has a significant effect on improving the mechanical and transport properties of lightweight concretes and that the efficiency of NS is much higher than that of SF. Moreover, depending on dosage, NS was found to have a negligible or decreasing influence on the drying shrinkage of concrete, after 28 days of curing. Microstructural studies confirmed that NS significantly affects the pore characteristics of concretes, thus resulting in concretes with denser and stronger microstructures.en
dc.description.sponsorshipEC/H2020/841592/EU/Ultra-Lightweight Concrete for 3D printing technologies/Ultra-LightCon-3Den
dc.identifier.eissn1879-0526
dc.identifier.issn0950-0618
dc.identifier.urihttps://depositonce.tu-berlin.de/handle/11303/12435
dc.identifier.urihttp://dx.doi.org/10.14279/depositonce-11277
dc.language.isoenen
dc.rights.urihttps://creativecommons.org/licenses/by/4.0/en
dc.subject.ddc690 Hausbau, Bauhandwerkde
dc.subject.otherlight-weight concreteen
dc.subject.otherultra-lightweight concreteen
dc.subject.othermechanical performanceen
dc.subject.otherdrying shrinkageen
dc.subject.otherporosityen
dc.subject.othernanosilicaen
dc.subject.othermicro-CTen
dc.subject.otherRapidAiren
dc.subject.otherthermal conductivityen
dc.subject.otherthermal insulationen
dc.titleEvaluating the effects of nanosilica on the material properties of lightweight and ultra-lightweight concrete using image-based approachesen
dc.typeArticleen
dc.type.versionpublishedVersionen
dcterms.bibliographicCitation.articlenumber120241en
dcterms.bibliographicCitation.doi10.1016/j.conbuildmat.2020.120241en
dcterms.bibliographicCitation.journaltitleConstruction and Building Materialsen
dcterms.bibliographicCitation.originalpublishernameElsevieren
dcterms.bibliographicCitation.originalpublisherplaceAmsterdamen
dcterms.bibliographicCitation.volume264en
tub.accessrights.dnbfreeen
tub.affiliationFak. 6 Planen Bauen Umwelt>Inst. Bauingenieurwesen>FG Baustoffe und Bauchemiede
tub.affiliation.facultyFak. 6 Planen Bauen Umweltde
tub.affiliation.groupFG Baustoffe und Bauchemiede
tub.affiliation.instituteInst. Bauingenieurwesende
tub.publisher.universityorinstitutionTechnische Universität Berlinen
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