<?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>2477-9105</journal-id>
<journal-title><![CDATA[Perfiles]]></journal-title>
<abbrev-journal-title><![CDATA[Perfiles]]></abbrev-journal-title>
<issn>2477-9105</issn>
<publisher>
<publisher-name><![CDATA[Escuela Superior Politécnica de Chimborazo]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S2477-91052025000200059</article-id>
<article-id pub-id-type="doi">10.47187/perf.v1i34.362</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[INFLUENCIA DE LA NANOSÍLICE EXTRAÍDA DE CAPARAZONES DE CANGREJO EN LAS PROPIEDADES FÍSICO-MECÁNICAS DE LOS MORTEROS DE CEMENTO]]></article-title>
<article-title xml:lang="en"><![CDATA[Influence of nanosilica extracted from crab shells on the physical-mechanical properties of cement mortars]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Alvansazyazdi]]></surname>
<given-names><![CDATA[Mohammadfarid]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
<xref ref-type="aff" rid="Aaf"/>
<xref ref-type="aff" rid="A a"/>
<xref ref-type="aff" rid="A3"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Logacho-Morales]]></surname>
<given-names><![CDATA[Andrea Estefanía]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Molina-Freire]]></surname>
<given-names><![CDATA[Wilson Steven]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Santamaría-Carrera]]></surname>
<given-names><![CDATA[Jorge Luis]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Cadena-Perugachi]]></surname>
<given-names><![CDATA[Hugo Alexander]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Bonilla-Valladares]]></surname>
<given-names><![CDATA[Pablo Mauricio]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Lascano-Robalino]]></surname>
<given-names><![CDATA[Natali Elizabeth]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Bucheli-García]]></surname>
<given-names><![CDATA[Jorge Alexander]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
<xref ref-type="aff" rid="Aaf"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Soledispa-Pereira]]></surname>
<given-names><![CDATA[Edwin Iván]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Crespo-Bravo]]></surname>
<given-names><![CDATA[Jorge Oswaldo]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Oleas-Escalante]]></surname>
<given-names><![CDATA[Marcelo Fabian]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Jiménez-Merchán]]></surname>
<given-names><![CDATA[Carmita Guadalupe]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Espinoza-Cotera]]></surname>
<given-names><![CDATA[Ángel Mauricio]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Martial-Debut]]></surname>
<given-names><![CDATA[Alexis Patrice]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Heredia-Ayala]]></surname>
<given-names><![CDATA[Byron Giovanoli]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Tapia-Vargas]]></surname>
<given-names><![CDATA[Jhon Fabricio]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universitat Politécnica de Valéncia Spain Institute of Science and Concrete Technology ]]></institution>
<addr-line><![CDATA[Valencia ]]></addr-line>
<country>Spain</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Central University of Ecuador Faculty of Engineering and Applied Sciences Civil Engineering Department]]></institution>
<addr-line><![CDATA[Quito ]]></addr-line>
<country>Ecuador</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Laica Eloy Alfaro de Manabi University Faculty of Engineering Industrial and Architecture School of Civil Engineering]]></institution>
<addr-line><![CDATA[Manta ]]></addr-line>
<country>Ecuador</country>
</aff>
<aff id="Af4">
<institution><![CDATA[,Central University of Ecuador Faculty of Chemical Sciences ]]></institution>
<addr-line><![CDATA[Quito ]]></addr-line>
<country>Ecuador</country>
</aff>
<aff id="Af5">
<institution><![CDATA[,Central University of Ecuador Faculty of Engineering and Applied Sciences Information Systems Department]]></institution>
<addr-line><![CDATA[Quito ]]></addr-line>
<country>Ecuador</country>
</aff>
<aff id="Af6">
<institution><![CDATA[,Pontifical Catholic University of Ecuador Department of Civil Engineering ]]></institution>
<addr-line><![CDATA[Quito ]]></addr-line>
<country>Ecuador</country>
</aff>
<aff id="Af7">
<institution><![CDATA[,Terminal portuario de Manta  ]]></institution>
<addr-line><![CDATA[Manta ]]></addr-line>
<country>Ecuador</country>
</aff>
<aff id="Af8">
<institution><![CDATA[,University of the Armed Forces ESPE Department of Life Sciences and Agriculture Center for Nanoscience and Nanotechnology]]></institution>
<addr-line><![CDATA[Sangolquí ]]></addr-line>
<country>Ecuador</country>
</aff>
<aff id="Af9">
<institution><![CDATA[,Constructora COCEVIM T&T S.A.  ]]></institution>
<addr-line><![CDATA[Quito ]]></addr-line>
<country>Ecuador</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>12</month>
<year>2025</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>12</month>
<year>2025</year>
</pub-date>
<volume>1</volume>
<numero>34</numero>
<fpage>59</fpage>
<lpage>76</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://scielo.senescyt.gob.ec/scielo.php?script=sci_arttext&amp;pid=S2477-91052025000200059&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://scielo.senescyt.gob.ec/scielo.php?script=sci_abstract&amp;pid=S2477-91052025000200059&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://scielo.senescyt.gob.ec/scielo.php?script=sci_pdf&amp;pid=S2477-91052025000200059&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen Esta investigación evalúa el uso de desechos de caparazones de cangrejo para mejorar morteros, incorporando nanosílice al 0.25% en peso del cemento como alternativa sostenible. Las nanopartículas, obtenidas de residuos biológicos, se aplicaron en cementos Tipo N y HS, formulados para mampostería y resistencia a sulfatos. La metodología incluyó síntesis de nanopartículas, ensayos de compresión uniaxial, pruebas de permeabilidad y análisis microestructural (XRD y SEM). Los resultados muestran que la nanosílice incrementa resistencia y durabilidad, aunque la nanoquitina y nanopartículas de cal fueron más eficaces a largo plazo. La mezcla C+S&#8320;.&#8322;&#8325;% alcanzó 31.22 MPa a 90 días, similar a su control (31.63 MPa), mientras que M+S&#8320;.&#8322;&#8325;% aumentó un 3.2% frente a su referencia. El aumento de resistencia en edades tempranas (24 h-7 d) indica que la nanosílice acelera la hidratación y densifica la matriz, mejorando la cohesión interna. Las pruebas de permeabilidad evidenciaron comportamiento hidrofóbico (ángulos &gt;90°), reduciendo la absorción de agua y favoreciendo la durabilidad. Esta estrategia optimiza el desempeño del mortero y promueve la sostenibilidad mediante la reutilización de residuos, alineándose con la economía circular y la nanotecnología, demostrando la viabilidad de nanosílice derivada de cangrejo en materiales de construcción ecoeficientes.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract This study evaluates the use of crab shell waste to enhance mortar properties by incorporating nanosilica at 0.25% by cement weight as a sustainable alternative. The nanoparticles, obtained from biological waste, were applied to Type N and HS cements, formulated for masonry and sulfate-resistant applications. The methodology included nanoparticle synthesis, uniaxial compression tests, permeability assessments, and microstructural analyses (XRD and SEM). Results show that nanosilica improves compressive strength and durability, although nanochitin and calcium nanoparticles proved more effective in long-term performance. The C+S&#8320;.&#8322;&#8325;% mixture reached 31.22 MPa at 90 days, similar to its control (31.63 MPa), while M+S&#8320;.&#8322;&#8325;% achieved a 3.2% strength increase compared to its reference. The early-age strength gain (24 h-7 d) indicates that nanosilica accelerates cement hydration and densifies the matrix, improving internal cohesion. Permeability tests revealed hydrophobic behavior (contact angles &gt;90°), reducing water absorption and enhancing durability. This approach optimizes mortar performance while promoting sustainability through the reuse of waste materials. It aligns with circular economy principles and nanotechnology applications, demonstrating the feasibility of using crab-derived nanosilica in the development of eco-efficient construction materials.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Nanosílice]]></kwd>
<kwd lng="es"><![CDATA[mortero]]></kwd>
<kwd lng="es"><![CDATA[resistencia a la compresión]]></kwd>
<kwd lng="es"><![CDATA[microestructura]]></kwd>
<kwd lng="es"><![CDATA[sostenibilidad]]></kwd>
<kwd lng="en"><![CDATA[Nanosilica]]></kwd>
<kwd lng="en"><![CDATA[mortar]]></kwd>
<kwd lng="en"><![CDATA[compressive strength]]></kwd>
<kwd lng="en"><![CDATA[microstructure]]></kwd>
<kwd lng="en"><![CDATA[sustainability]]></kwd>
</kwd-group>
</article-meta>
</front><back>
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