Influence of Nanosilica on Mechanical Properties, Sorptivity, and Microstructure of Lightweight Concrete

dc.contributor.authorAbd Elrahman, Mohamed
dc.contributor.authorChung, Sang-Yeop
dc.contributor.authorSikora, Pawel
dc.contributor.authorRucinska, Teresa
dc.contributor.authorStephan, Dietmar
dc.date.accessioned2019-11-19T14:17:49Z
dc.date.available2019-11-19T14:17:49Z
dc.date.issued2019-09-21
dc.date.updated2019-10-08T08:42:46Z
dc.description.abstractThis study presents the results of an experimental investigation of the effects of nanosilica (NS) on the strength development, transport properties, thermal conductivity, air-void, and pore characteristics of lightweight aggregate concrete (LWAC), with an oven-dry density <1000 kg/m3. Four types of concrete mixtures, containing 0 wt.%, 1 wt.%, 2 wt.%, and 4 wt.% of NS were prepared. The development of flexural and compressive strengths was determined for up to 90 days of curing. In addition, transport properties and microstructural properties were determined, with the use of RapidAir, mercury intrusion porosimetry (MIP), and scanning electron microscopy (SEM) techniques. The experimental results showed that NS has remarkable effects on the mechanical and transport properties of LWACs, even in small dosages. A significant improvement in strength and a reduction of transport properties, in specimens with an increased NS content, was observed. However, the positive effects of NS were more pronounced when a higher amount was incorporated into the mixtures (>1 wt.%). NS contributed to compaction of the LWAC matrix and a modification of the air-void system, by increasing the amount of solid content and refining the fine pore structure, which translated to a noticeable improvement in mechanical and transport properties. On the other hand, NS decreased the consistency, while increasing the viscosity of the fresh mixture. An increment of superplasticizer (SP), along with a decrement of stabilizer (ST) dosages, are thus required.en
dc.description.sponsorshipEC/H2020/841592/EU/Ultra-Lightweight Concrete for 3D printing technologies/Ultra-LightCon-3Den
dc.description.sponsorshipDFG, 414044773, Open Access Publizieren 2019 - 2020 / Technische Universität Berlinen
dc.identifier.eissn1996-1944
dc.identifier.urihttps://depositonce.tu-berlin.de/handle/11303/10337
dc.identifier.urihttp://dx.doi.org/10.14279/depositonce-9299
dc.language.isoenen
dc.rights.urihttps://creativecommons.org/licenses/by/4.0/en
dc.subject.ddc600 Technik, Technologiede
dc.subject.otherlightweight aggregate concreteen
dc.subject.othernanosilicaen
dc.subject.othercement-based compositesen
dc.subject.othermechanical propertiesen
dc.subject.otherwater absorptionen
dc.subject.othersorptivityen
dc.subject.otherporosityen
dc.titleInfluence of Nanosilica on Mechanical Properties, Sorptivity, and Microstructure of Lightweight Concreteen
dc.typeArticleen
dc.type.versionpublishedVersionen
dcterms.bibliographicCitation.articlenumber3078en
dcterms.bibliographicCitation.doi10.3390/ma12193078en
dcterms.bibliographicCitation.issue19en
dcterms.bibliographicCitation.journaltitleMaterialsen
dcterms.bibliographicCitation.originalpublishernameMDPIen
dcterms.bibliographicCitation.originalpublisherplaceBaselen
dcterms.bibliographicCitation.volume12en
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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