<?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>0123-3033</journal-id>
<journal-title><![CDATA[Ingeniería y competitividad]]></journal-title>
<abbrev-journal-title><![CDATA[Ing. compet.]]></abbrev-journal-title>
<issn>0123-3033</issn>
<publisher>
<publisher-name><![CDATA[Facultad de Ingeniería, Universidad del Valle]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0123-30332022000100007</article-id>
<article-id pub-id-type="doi">10.25100/iyc.24i1.10985</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Mechanical, physical and thermoacoustic properties of lightweight composite geopolymers]]></article-title>
<article-title xml:lang="es"><![CDATA[Propiedades mecánicas, físicas y termoacústicas de geopolímeros compuestos aligerados]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Villaquirán-Caicedo]]></surname>
<given-names><![CDATA[Mónica A.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Perea]]></surname>
<given-names><![CDATA[Vilmary N.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Ruiz]]></surname>
<given-names><![CDATA[Jhon E.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Gutiérrez]]></surname>
<given-names><![CDATA[Ruby Mejía de]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad del Valle Facultad de Ingeniería Escuela de Ingeniería de Materiales]]></institution>
<addr-line><![CDATA[Cali ]]></addr-line>
<country>Colombia</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>06</month>
<year>2022</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>06</month>
<year>2022</year>
</pub-date>
<volume>24</volume>
<numero>1</numero>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_arttext&amp;pid=S0123-30332022000100007&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_abstract&amp;pid=S0123-30332022000100007&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_pdf&amp;pid=S0123-30332022000100007&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract This research evaluates the physical and mechanical properties of particulate composites, produced from geopolymer paste with the incorporation of different organic type wastes as expanded polystyrene (EP), corkwood (CK), tire rubber (RB); in percentages by volume of 2, 4, and 6%. Metakaolin was used as a precursor of the geopolymer produced by alkali activation from NaOH and sodium silicate. The geopolymer composites were cured at room temperature. Properties as density, porosity, absorption, compressive strength, thermal conductivity, and acoustic behavior were evaluated. As complementary techniques, light and scanning electron microscopy were used. It was observed that the high alkalinity of the geopolymer mixture causes deterioration of the CK particles. Composites with the incorporation of 4% of the EP and RB particles reported compressive strength of 32 and 45 MPa at 28 days, and apparent density of 1853 and 1922 kg/m3, respectively, which represents a reduction of 6.08% and 2.58% in comparison to the GP reference. The thermal conductivity for composites with 4% of EP and RB was 0.316 and 0.344 W/m.K and the sound absorption coefficient was evaluated at frequencies of 500 Hz, 0.70, and 0.50 respectively. The evaluated performance properties show the feasibility of using 4% of EP and RB for the manufacture of geopolymer composites for applications in thermal and sound insulating panels.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen Esta investigación evalúa las propiedades físicas, mecánicas y termoacústicas de materiales compuestos particulados de matriz geopolimérica con incorporación de partículas orgánicas proveniente de residuos como poliestireno expandido (EP), madera (CK) y residuos de llantas (RB), en porcentajes de 2, 4 y % en volumen. Metakaolin fue usado como precursor del geopolímero producido por activación con NaOH y silicato de sodio. Los materiales fueron obtenidos a temperatura ambiente. Propiedades como densidad, porosidad, absorción, resistencia a la compresión, y medidas de conductividad térmica y propiedades acústicas fueron evaluadas en los compuestos desarrollados. Complementariamente fueron realizadas observaciones en microscopio óptico y electrónico. Los resultados mostraron que la alta alcalinidad de la matriz geopolimérica deteriora las partículas de CK. Para los materiales compuestos con incorporación de EP y RB en 4%, reportaron resistencia a la compresión de 32 y 45 MPa a 28 días, y densidades de 1853 y 1922 kg/m3 respectivamente, lo cual representa una reducción de 6,08% y 2,58% en comparación a la matriz de referencia. La conductividad térmica de los compuestos con 4% de EP y RB fue de 0,314 y 0,344 W/m.K, y el coeficiente de absorción acústica a frecuencia de 500 Hz fue de 0,7 y 0,5 respectivamente. Las propiedades de desempeño evaluadas mostraron la facilidad de usar 4% de EP y RB para la manufactura de materiales compuestos para aplicaciones como paneles de aislamiento térmico y acústico.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[corkwood]]></kwd>
<kwd lng="en"><![CDATA[expanded polystyrene]]></kwd>
<kwd lng="en"><![CDATA[geopolymer]]></kwd>
<kwd lng="en"><![CDATA[rubber wastes]]></kwd>
<kwd lng="en"><![CDATA[thermoacoustic insulator]]></kwd>
<kwd lng="es"><![CDATA[aislamiento termoacústico]]></kwd>
<kwd lng="es"><![CDATA[geopolímero]]></kwd>
<kwd lng="es"><![CDATA[madera]]></kwd>
<kwd lng="es"><![CDATA[poliestireno expandido]]></kwd>
<kwd lng="es"><![CDATA[residuos de caucho]]></kwd>
</kwd-group>
</article-meta>
</front><back>
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