<?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>0120-6230</journal-id>
<journal-title><![CDATA[Revista Facultad de Ingeniería Universidad de Antioquia]]></journal-title>
<abbrev-journal-title><![CDATA[Rev.fac.ing.univ. Antioquia]]></abbrev-journal-title>
<issn>0120-6230</issn>
<publisher>
<publisher-name><![CDATA[Facultad de Ingeniería, Universidad de Antioquia]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0120-62302016000400081</article-id>
<article-id pub-id-type="doi">10.17533/udea.redin.n81a08</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Influence of very fine fraction of mixed recycled aggregates on the mechanical properties and durability of mortars and concretes]]></article-title>
<article-title xml:lang="es"><![CDATA[Influencia de la fracción muy fina de áridos reciclados mixtos en las propiedades mecánicas y durabilidad de morteros y hormigones]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Castaño-Cardoza]]></surname>
<given-names><![CDATA[Taimí]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Linsel]]></surname>
<given-names><![CDATA[Stefan]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Alujas-Diaz]]></surname>
<given-names><![CDATA[Adrián]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Orozco-Morales]]></surname>
<given-names><![CDATA[Rubén]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Martirena-Hernández]]></surname>
<given-names><![CDATA[José Fernando]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad de Oriente Facultad de Construcciones ]]></institution>
<addr-line><![CDATA[Santiago de Cuba ]]></addr-line>
<country>Cuba</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,University of Applied Sciences Faculty of Architectural and Civil Engineer ]]></institution>
<addr-line><![CDATA[Karlsruhe ]]></addr-line>
<country>Germany</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Universidad Central &#8220;Marta Abreu&#8221; de las Villas Facultad de Construcciones ]]></institution>
<addr-line><![CDATA[Santa Clara ]]></addr-line>
<country>Cuba</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>09</month>
<year>2016</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>09</month>
<year>2016</year>
</pub-date>
<numero>81</numero>
<fpage>81</fpage>
<lpage>92</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_arttext&amp;pid=S0120-62302016000400081&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_abstract&amp;pid=S0120-62302016000400081&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_pdf&amp;pid=S0120-62302016000400081&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[ABSTRACT Recycled aggregates from mixed recycled wastes have a high content of particles with size under 63 µm. This material is generally considered undesirable, since it increases water demand. However, these fines could fill out gaps between cement grains and increase packing density. The present work assesses the influence of fines under 63 µm on mortar and concrete made with mixed recycled aggregates. Pozzolanic activity of the powder, measured by isothermal calorimetry proves to be very low, so the material acts basically as a filler. Mortars with 6% of this fine material have a higher water demand, and thus a reduced compressive strength. However, the fine material contributes to decrease the effective porosity and increases the density of the matrix. This effect could help improving durability of the cementitious matrix. Alkalis tests carried out on mortars having 6% of fines under 63 µm show that expansion is reduced, and the probable cause is the refinement of the pore structure through the increased packing density. Observations of polished section of concrete having 6% of fines under 63 µm made with at SEM, coupled with image processing, show a densification of the ITZ around the aggregates, possibly due to the contribution of the very fine fraction to packing density. The beneficial contribution of the very fine fraction could compensate problems with rheology and mechanical properties assessed in mortars and concrete.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[RESUMEN La producción de áridos de residuos mixtos reciclados genera un elevado contenido de partículas por debajo de 63 µm. Este material puede ocasionar un incremento de la demanda de agua, sin embargo, pueden contribuir a rellenar espacios entre los granos de cemento. El presente trabajo evalúa la influencia del material por debajo 63 µm de áridos reciclados mixtos en las propiedades de hormigones y morteros. La actividad puzolánica medida por calorimetría isotérmica fue muy baja. El uso del 6% del material en morteros incrementa la demanda de agua, ocasiona una reducción de la resistencia, pero disminuye la porosidad efectiva de la matriz e incrementa la densidad de la ITZ. Los ensayos de expansión por álcalis en morteros mostraron una reducción de la porosidad conectada de la matriz. La misma tendencia fue observada en el hormigón. La contribución beneficiosa de dicha fracción puede compensar los problemas en la reología y en las propiedades mecánicas.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[Debris]]></kwd>
<kwd lng="en"><![CDATA[recycled]]></kwd>
<kwd lng="en"><![CDATA[aggregates]]></kwd>
<kwd lng="en"><![CDATA[expansion]]></kwd>
<kwd lng="en"><![CDATA[alkali]]></kwd>
<kwd lng="en"><![CDATA[pores structure]]></kwd>
<kwd lng="en"><![CDATA[rheology]]></kwd>
<kwd lng="es"><![CDATA[Escombros]]></kwd>
<kwd lng="es"><![CDATA[reciclado]]></kwd>
<kwd lng="es"><![CDATA[áridos]]></kwd>
<kwd lng="es"><![CDATA[expansión]]></kwd>
<kwd lng="es"><![CDATA[álcali]]></kwd>
<kwd lng="es"><![CDATA[estructura de poros]]></kwd>
<kwd lng="es"><![CDATA[reología]]></kwd>
</kwd-group>
</article-meta>
</front><back>
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