An Investigation of the Mechanical and Physical Characteristics of Cement Paste Incorporating Different Air Entraining Agents using X-ray Micro-Computed Tomography

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dc.contributor.authorAbd Elrahman, Mohamed
dc.contributor.authorEl Madawy, Mohamed E.
dc.contributor.authorChung, Sang-Yeop
dc.contributor.authorMajer, Stanisław
dc.contributor.authorYoussf, Osama
dc.contributor.authorSikora, Pawel
dc.date.accessioned2020-04-29T15:15:42Z
dc.date.available2020-04-29T15:15:42Z
dc.date.issued2020-01-06
dc.date.updated2020-03-06T11:26:49Z
dc.description.abstractImproving the thermal insulation properties of cement-based materials is the key to reducing energy loss and consumption in buildings. Lightweight cement-based composites can be used efficiently for this purpose, as a structural material with load bearing ability or as a non-structural one for thermal insulation. In this research, lightweight cement pastes containing fly ash and cement were prepared and tested. In these mixes, three different techniques for producing air voids inside the cement paste were used through the incorporation of aluminum powder (AL), air entraining agent (AA), and hollow microspheres (AS). Several experiments were carried out in order to examine the structural and physical characteristics of the cement composites, including dry density, compressive strength, porosity and absorption. A Hot Disk device was used to evaluate the thermal conductivity of different cement composites. In addition, X-ray micro-computed tomography (micro-CT) was adopted to investigate the microstructure of the air-entrained cement pastes and the spatial distribution of the voids inside pastes without destroying the specimens. The experimental results obtained showed that AS specimens with admixture of hollow microspheres can improve the compressive strength of cement composites compared to other air entraining admixtures at the same density level. It was also confirmed that the incorporation of aluminum powder creates large voids, which have a negative effect on specimens’ strength and absorption.en
dc.description.sponsorshipEC/H2020/841592/EU/Ultra-Lightweight Concrete for 3D printing technologies/Ultra-LightCon-3Den
dc.identifier.eissn2073-4352
dc.identifier.urihttps://depositonce.tu-berlin.de/handle/11303/11052
dc.identifier.urihttp://dx.doi.org/10.14279/depositonce-9940
dc.language.isoenen
dc.rights.urihttps://creativecommons.org/licenses/by/4.0/en
dc.subject.ddc621 Angewandte Physikde
dc.subject.otherlightweight cement pasteen
dc.subject.otherair entraining agentsen
dc.subject.otherhollow microspheresen
dc.subject.otheraluminum powderen
dc.subject.otherporesen
dc.subject.othermicro-CTen
dc.subject.otherthermal insulationen
dc.subject.othercompressive strengthen
dc.titleAn Investigation of the Mechanical and Physical Characteristics of Cement Paste Incorporating Different Air Entraining Agents using X-ray Micro-Computed Tomographyen
dc.typeArticleen
dc.type.versionpublishedVersionen
dcterms.bibliographicCitation.articlenumber23en
dcterms.bibliographicCitation.doi10.3390/cryst10010023en
dcterms.bibliographicCitation.issue1en
dcterms.bibliographicCitation.journaltitleCrystalsen
dcterms.bibliographicCitation.originalpublishernameMDPIen
dcterms.bibliographicCitation.originalpublisherplaceBaselen
dcterms.bibliographicCitation.volume10en
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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