<?xml version="1.0" encoding="ISO-8859-1"?><article xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<front>
<journal-meta>
<journal-id>0012-7353</journal-id>
<journal-title><![CDATA[DYNA]]></journal-title>
<abbrev-journal-title><![CDATA[Dyna rev.fac.nac.minas]]></abbrev-journal-title>
<issn>0012-7353</issn>
<publisher>
<publisher-name><![CDATA[Universidad Nacional de Colombia]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0012-73532018000400123</article-id>
<article-id pub-id-type="doi">10.15446/dyna.v85n207.70593</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Thermal damage evaluation of full scale concrete columns exposed to high temperatures using scanning electron microscopy and X-ray diffraction]]></article-title>
<article-title xml:lang="es"><![CDATA[Evaluación del daño térmico de columnas de hormigón a gran escala expuestas a altas temperaturas utilizando microscopía electrónica de barrido y difracción de rayos X]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Fernandes]]></surname>
<given-names><![CDATA[Bruno]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Masiero Gil]]></surname>
<given-names><![CDATA[Augusto]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Longhi Bolina]]></surname>
<given-names><![CDATA[Fabrício]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Fonseca Tutikian]]></surname>
<given-names><![CDATA[Bernardo]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidade Estadual de Campinas  ]]></institution>
<addr-line><![CDATA[Campinas ]]></addr-line>
<country>Brazil</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidade do Vale do Rio dos Sinos  ]]></institution>
<addr-line><![CDATA[São Leopoldo ]]></addr-line>
<country>Brazil</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>12</month>
<year>2018</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>12</month>
<year>2018</year>
</pub-date>
<volume>85</volume>
<numero>207</numero>
<fpage>123</fpage>
<lpage>128</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_arttext&amp;pid=S0012-73532018000400123&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_abstract&amp;pid=S0012-73532018000400123&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_pdf&amp;pid=S0012-73532018000400123&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract When exposed to elevated temperatures, concrete suffers physicochemical changes, resulting in reduction of mechanical properties, cracking and spalling. These macroscopic changes are related to changes in the microstructure of concrete. In this paper, the microstructure of thermally damaged concrete from real-scale reinforced concrete columns was studied, using scanning electron microscopy (SEM) and x-ray diffraction (XRD). Two real-scale reinforced concrete columns, with different concrete mixtures, were exposed to ISO 834 fire standard curve for 4 hours. After heating, concrete core samples were drilled, sectioned and analyzed in different column section depths. Core samples from reference column not exposed to high temperatures, were also obtained. Macroscopic observations showed a change in the color of concrete exposed to high temperatures. SEM micrographs presented distinct changes in morphology, like coarsening, and the presence of cracks and voids. XRD diagrams showed a reduction of portlandite and presence of larnite as depth increases.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen Cuando se expone a temperaturas elevadas, el concreto sufre cambios fisicoquímicos relacionados con cambios en la microestructura del hormigón. En este artículo, se estudió la microestructura del concreto dañado térmicamente en columnas de hormigón armado a escala real, utilizando microscopía electrónica de barrido (SEM) y difracción de rayos X (XRD). Dos columnas de hormigón armado a escala real, con diferentes mezclas de hormigón, se expusieron a la curva estándar de fuego ISO 834 durante 4 horas. Las observaciones macroscópicas mostraron un cambio en el color del concreto expuesto a altas temperaturas. Las micrografías SEM presentaron cambios distintos en la morfología, como el engrosamiento y la presencia de grietas y huecos. Los diagramas de XRD mostraron una reducción de portlandita y la presencia de larnita a medida que aumentó la profundidad.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[concrete]]></kwd>
<kwd lng="en"><![CDATA[high temperature]]></kwd>
<kwd lng="en"><![CDATA[microstructure]]></kwd>
<kwd lng="en"><![CDATA[scanning electron microscopy (SEM)]]></kwd>
<kwd lng="en"><![CDATA[x-ray diffraction (XRD)]]></kwd>
<kwd lng="es"><![CDATA[hormigón]]></kwd>
<kwd lng="es"><![CDATA[altas temperaturas]]></kwd>
<kwd lng="es"><![CDATA[microestrutura]]></kwd>
<kwd lng="es"><![CDATA[microscopía electrónica de barrido (SEM)]]></kwd>
<kwd lng="es"><![CDATA[difracción de rayos X (XRD)]]></kwd>
</kwd-group>
</article-meta>
</front><back>
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