Microstructure and hardness of cement pastes with mineral admixture

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dc.creatorDayana Cristina Silva Garcia
dc.creatorMarcela Maira Nascimento de Souza Soares
dc.creatorAugusto Cesar da Silva Bezerra
dc.creatorMaria Teresa Paulino Aguilar
dc.creatorRoberto Braga Figueiredo
dc.date.accessioned2023-07-25T17:26:00Z
dc.date.accessioned2025-09-08T23:24:40Z
dc.date.available2023-07-25T17:26:00Z
dc.date.issued2017
dc.identifier.doihttps://doi.org/10.1590/S1517-707620170002.0145
dc.identifier.issn11813-2017
dc.identifier.urihttps://hdl.handle.net/1843/56950
dc.languagepor
dc.publisherUniversidade Federal de Minas Gerais
dc.relation.ispartofMatéria (Rio de Janeiro)
dc.rightsAcesso Aberto
dc.subjectCimento
dc.subjectMicroscopio eletronico
dc.subject.otherDynamic hardness
dc.subject.otherCement paste
dc.subject.otherSugarcane bagasse ash
dc.subject.otherSilica fume
dc.subject.otherElectron microscopy
dc.titleMicrostructure and hardness of cement pastes with mineral admixture
dc.typeArtigo de periódico
local.citation.epage10
local.citation.issue2
local.citation.spage1
local.citation.volume22
local.description.resumoPortland cement pastes are highly heterogeneous material and exhibits heterogeneous features over a wide range of length scales. Mechanical properties of microstructure can be determined using depth-sensing inden tation. Coupled indentation/SEM technique can be used to location the indents and provides a way to deter mine the mechanical properties of a specific phase. Thus, the present paper aims to determine the hardness of different phases of cement pastes prepared with different mineral admixtures including sugarcane bagasse ash. The microstructure of cement pastes prepared with different mineral admixtures is analyzed by X ray diffraction, scanning electron microscopy and dynamic hardness tests on polished sections. The different backscatter coefficient allows to differentiate anhydrous phases from C-S-H, calcium hydroxide, silica fume and quartz. A grid of indentation is used to determine the hardness of the different phases and a complete phase segmentation of the different samples is achieved. The results show that the hardness of the different phases follow the sequence (from higher to lower hardness) quartz, anhydrous particles, calcium hydroxide, C-S-H and agglomerated silica fume. The presence of agglomerated silica fume is clearly observed in scan ning electron microscopy images and the poor mechanical properties of these areas might compromise the cement pastes. The microstructure of cement pastes prepared with sugarcane bagasse ashes is similar to the observed in samples with crushed quartz.
local.identifier.orcidhttps://orcid.org/0000-0002-8572-5531
local.identifier.orcidhttps://orcid.org/0000-0001-8546-4143
local.identifier.orcidhttps://orcid.org/0000-0003-1670-2376
local.identifier.orcidhttps://orcid.org/0000-0002-0121-0881
local.publisher.countryBrasil
local.publisher.departmentENG - DEPARTAMENTO DE ENGENHARIA MATERIAIS E DA CONSTRUÇÃO CIVIL
local.publisher.departmentENG - DEPARTAMENTO DE ENGENHARIA METALÚRGICA
local.publisher.initialsUFMG
local.url.externahttps://www.scielo.br/j/rmat/a/mvngtFLLcxBfrtmZ6CvRxhj/?lang=en#

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