<?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>2602-8484</journal-id>
<journal-title><![CDATA[FIGEMPA: Investigación y Desarrollo]]></journal-title>
<abbrev-journal-title><![CDATA[Figempa]]></abbrev-journal-title>
<issn>2602-8484</issn>
<publisher>
<publisher-name><![CDATA[Universidad Central de Ecuador ]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S2602-84842025000200201</article-id>
<article-id pub-id-type="doi">10.29166/rev&#64257;g.v20i2.7946</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Incorporation of Nanochitin in Cement Mortars: An Approach to Enhancing Durability and Sustainability]]></article-title>
<article-title xml:lang="es"><![CDATA[Incorporación de Nanoquitosano en Morteros de Cemento: Un Enfoque para Mejorar la Durabilidad y la Sostenibilidad]]></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"/>
</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"/>
</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[Espinoza-Cotera]]></surname>
<given-names><![CDATA[Angel 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 Politècnica de València 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 ]]></institution>
<addr-line><![CDATA[Quito ]]></addr-line>
<country>Ecuador</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Central University of Ecuador Faculty of Engineering and Applied Sciences ]]></institution>
<addr-line><![CDATA[Quito ]]></addr-line>
<country>Ecuador</country>
</aff>
<aff id="Af4">
<institution><![CDATA[,Central University of Ecuador Faculty of Engineering and Applied 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 ]]></institution>
<addr-line><![CDATA[Quito ]]></addr-line>
<country>Ecuador</country>
</aff>
<aff id="Af6">
<institution><![CDATA[,Central University of Ecuador Faculty of Chemical Sciences ]]></institution>
<addr-line><![CDATA[Quito ]]></addr-line>
<country>Ecuador</country>
</aff>
<aff id="Af7">
<institution><![CDATA[,Central University of Ecuador Faculty of Engineering and Applied Sciences ]]></institution>
<addr-line><![CDATA[Quito ]]></addr-line>
<country>Ecuador</country>
</aff>
<aff id="Af8">
<institution><![CDATA[,Central University of Ecuador Faculty of Engineering and Applied Sciences ]]></institution>
<addr-line><![CDATA[Quito ]]></addr-line>
<country>Ecuador</country>
</aff>
<aff id="Af9">
<institution><![CDATA[,Manta Port Terminal  ]]></institution>
<addr-line><![CDATA[Manta ]]></addr-line>
<country>Ecuador</country>
</aff>
<aff id="A10">
<institution><![CDATA[,Central University of Ecuador Faculty of Engineering and Applied Sciences ]]></institution>
<addr-line><![CDATA[Quito ]]></addr-line>
<country>Ecuador</country>
</aff>
<aff id="A11">
<institution><![CDATA[,Laica Eloy Alfaro de Manabi University Faculty of Engineering Industrial and Architecture ]]></institution>
<addr-line><![CDATA[Manta ]]></addr-line>
<country>Ecuador</country>
</aff>
<aff id="A12">
<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="A13">
<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="A14">
<institution><![CDATA[,COCEVIM T&T S.A. Construction Company  ]]></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>20</volume>
<numero>2</numero>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://scielo.senescyt.gob.ec/scielo.php?script=sci_arttext&amp;pid=S2602-84842025000200201&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://scielo.senescyt.gob.ec/scielo.php?script=sci_abstract&amp;pid=S2602-84842025000200201&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://scielo.senescyt.gob.ec/scielo.php?script=sci_pdf&amp;pid=S2602-84842025000200201&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract This study explores the use of nanochitin extracted from crab shell waste to enhance the mechanical and durability properties of cement-based mortars. Nanochitin, a biopolymer derived from chitin, has been identified as a promising nanomaterial additive that improves compressive strength, cohesion, and workability of cementitious composites. The methodology involved the synthesis, characterization, and incorporation of nanochitin in mortars using Type N and Type HS cements. The assessment of mechanical performance was conducted through uniaxial compression tests, permeability analysis, and microstructural characterization using Scanning Electron Microscopy (SEM) and X-ray Diffraction (XRD). The results indicate that nanochitin enhances hydration, contributing to an optimized cementitious matrix. The modified mortars exhibited higher compressive strength, reaching 9.18 MPa at 90 days in Type N cement. Furthermore, nanochitin demonstrated superior rheological properties, allowing for improved workability and water retention, particularly in arid environments. This study highlights the sustainability benefits of repurposing crab shell waste, aligning with circular economy principles and advancing the development of eco-friendly construction materials.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen Este estudio explora el uso de nanoquitosano extraído de residuos de caparazones de cangrejo para mejorar las propiedades mecánicas y de durabilidad de morteros a base de cemento. El nanoquitosano, un biopolímero derivado de la quitina, ha sido identificado como un aditivo nanomaterial prometedor que mejora la resistencia a la compresión, la cohesión y la trabajabilidad de los compuestos cementicios. La metodología incluyó la síntesis, caracterización e incorporación del nanoquitosano en morteros utilizando cementos Tipo N y Tipo HS. La evaluación del desempeño mecánico se llevó a cabo mediante ensayos de compresión uniaxial, análisis de permeabilidad y caracterización microestructural mediante Microscopía Electrónica de Barrido (SEM) y Difracción de Rayos X (XRD). Los resultados indican que el nanoquitosano mejora la hidratación, contribuyendo a una matriz cementicia optimizada. Los morteros modificados mostraron una mayor resistencia a la compresión, alcanzando los 9.18 MPa a los 90 días con cemento Tipo N. Además, el nanoquitosano demostró propiedades reológicas superiores, permitiendo una mejor trabajabilidad y retención de agua, especialmente en ambientes áridos. Este estudio destaca los beneficios en términos de sostenibilidad del reaprovechamiento de residuos de caparazones de cangrejo, en línea con los principios de economía circular y promoviendo el desarrollo de materiales de construcción ecológicos.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[Nanochitin]]></kwd>
<kwd lng="en"><![CDATA[mortar]]></kwd>
<kwd lng="en"><![CDATA[internal cohesion]]></kwd>
<kwd lng="en"><![CDATA[rheology]]></kwd>
<kwd lng="en"><![CDATA[sustainability]]></kwd>
<kwd lng="es"><![CDATA[Nanoquitosano]]></kwd>
<kwd lng="es"><![CDATA[mortero]]></kwd>
<kwd lng="es"><![CDATA[cohesión interna]]></kwd>
<kwd lng="es"><![CDATA[reología]]></kwd>
<kwd lng="es"><![CDATA[sostenibilidad]]></kwd>
</kwd-group>
</article-meta>
</front><back>
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