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dc.contributor.authorCuesta-Garcia, Ana Maria
dc.contributor.authorMorales-Cantero, Alejandro
dc.contributor.authorGomez-de-la-Torre, Angeles G.
dc.contributor.authorSantacruz-Cruz, Maria Isabel
dc.contributor.authorGarcía-Aranda, Miguel Ángel 
dc.date.accessioned2021-09-24T07:24:57Z
dc.date.available2021-09-24T07:24:57Z
dc.date.created2021
dc.date.issued2021
dc.identifier.urihttps://hdl.handle.net/10630/22880
dc.description.abstractPortland cement (PC) is the most manufactured product in the world. However, cement industry is one of the major contributors for greenhouse gas emissions. For every ton of grey PC clinker, around 0.87 CO2 tons are released into the atmosphere. For this reason, alternative cements having similar performances to ordinary PC are needed. A recent work [1] has identified the use of supplementary cementitious materials (SCMs) as the most favourable approach for lowering CO2 emissions in the cement industry. The hydration reactions of tricalcium silicate, Ca3SiO5 (main phase of PC) consist of its dissolution, the precipitation of the nanocrystalline C-S-H gel, jointly with the formation of portlandite, Ca(OH)2 according to equation (1). C-S-H gel was described to be composed by defective nanocrystalline clinotobermorite, amorphous Ca(OH)2 and gel pore water [2]. The calcium hydroxide formed in reaction (1) can be employed to yield additional secondary C-(A)-S-H through the pozzolanic reaction with SCMs. Ca3SiO5 + 5.2H2O→1.2Ca(OH)2 +1/9[Ca11Si9O28(OH)2.8.5H2O] // 0.58[Ca(OH)2] // 2.37H2O (1) Crystalline C-S-H gel –nanocrystalline // amorphous . The analysis of nanocrystalline/amorphous phases in cement matrices which contain high amounts of crystalline phases is very challenging. Pair distribution function (PDF) in combination with synchrotron radiation is key to characterize cement pastes. This work focuses on the characterization of amorphous and nanocrystalline phases which are present in cement related pastes by total scattering PDF. We have studied a series of tricalcium silicate pastes blended with silica fume hydrated at four months and dicalcium silicate pastes hydrated at longer ages [3]. PDF data were collected at ALBA Synchrotron, beamline MSPD, see Figure 1.es_ES
dc.description.sponsorshipThis research was funded by Ministry of Science (Spain), grant number PID2019-104378RJ-I00es_ES
dc.language.isospaes_ES
dc.rightsinfo:eu-repo/semantics/openAccesses_ES
dc.rights.urihttp://creativecommons.org/licenses/by-nc-nd/4.0/*
dc.subjectNanotecnología - Congresoses_ES
dc.subjectCemento - Industriaes_ES
dc.subject.otherPair distributiones_ES
dc.subject.otherC-S-H gelses_ES
dc.titlePair distribution function as a tool to characterize C-S-H gelses_ES
dc.typeinfo:eu-repo/semantics/conferenceObjectes_ES
dc.centroFacultad de Cienciases_ES
dc.relation.eventtitleInternational workshop on total scattering for nanotechnology in Al Andaluses_ES
dc.relation.eventplaceGranadaes_ES
dc.relation.eventdate20/09/2021es_ES
dc.rights.ccAttribution-NonCommercial-NoDerivatives 4.0 Internacional*


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