Study of the interface between the steel fibre and cement-paste by scanning electron microscope and energy dispersive X-ray analysis

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dc.contributor Aalto-yliopisto fi
dc.contributor Aalto University en
dc.contributor.advisor Eik, Marika
dc.contributor.author Antonova, Anna
dc.date.accessioned 2016-12-22T11:24:38Z
dc.date.available 2016-12-22T11:24:38Z
dc.date.issued 2016-12-12
dc.identifier.uri https://aaltodoc.aalto.fi/handle/123456789/24016
dc.description.abstract The morphology of the interfacial transition zone, (ITZ), present at steel fibre and cement-paste interface was studied by using the environmental scanning electron microscope. Based on the available literature, the ITZ is the weakest and most porous layer connecting the constituents of the composite and which is important for the tensile capacity of the concrete reinforced with steel fibre. The micro-structures of the ITZ and bulk cement-matrix are different. Different cement-paste recipes and curing conditions were examined in the study. The samples were investigated by using the environmental scanning electron microscope and energy dispersive X-ray analysis. The backscattered and secondary electron detectors were employed. The images with the resolution of 500 μm were made to study the geometrical characteristics of steel fibres used. The resolution of 5 μm was used to identify the stiction between the steel fibre and cement-paste.The chemical consistency within the ITZ layer was specified by X-ray detector, by which calcium hydroxide, (CH), and calcium-silicate-hydrate crystals , (C-S-H), and the agglomeration of silica fume were detected. The results demonstrated that the presence of the gap between the steel fibre and cement-paste was observed in 80% of the cases studied. The particles of CH and C-S-H were sticked to the surface of the steel fibre, but they were not connected to the bulk cement-paste. The stiction between the steel fibre and cement-paste was the lowest in samples with the silica fume. The study support an assumption that the adhesion at the interface between the steel fibre and cement-paste may not exist. en
dc.format.extent 44+7
dc.language.iso en en
dc.title Study of the interface between the steel fibre and cement-paste by scanning electron microscope and energy dispersive X-ray analysis en
dc.type G2 Pro gradu, diplomityö fi
dc.contributor.school Insinööritieteiden korkeakoulu fi
dc.subject.keyword Interfacial transition zone en
dc.subject.keyword scanning electron microscope en
dc.subject.keyword steel fibre reinforced concrete en
dc.subject.keyword energy dispersive X-ray en
dc.subject.keyword adhesion en
dc.identifier.urn URN:NBN:fi:aalto-201612226309
dc.programme.major Structural Engineering fi
dc.programme.mcode R3001 fi
dc.type.ontasot Master's thesis en
dc.type.ontasot Diplomityö fi
dc.contributor.supervisor Puttonen, Jari
dc.programme Master's Degree in Structural Engineering and Building Technology fi


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