<?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>2304-0106</journal-id>
<journal-title><![CDATA[Anales de la Academia de Ciencias de Cuba]]></journal-title>
<abbrev-journal-title><![CDATA[Anales de la ACC]]></abbrev-journal-title>
<issn>2304-0106</issn>
<publisher>
<publisher-name><![CDATA[Academia de Ciencias de Cuba]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S2304-01062021000300006</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Identificación y evaluación de arcillas caoliníticas para la producción de cemento ternario LC3 y adiciones minerales activas LC2]]></article-title>
<article-title xml:lang="en"><![CDATA[Identification and assessment of kaolinitic clays for the production of ternary cement LC3 and active mineral admixtures LC2]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Almenares Reyes]]></surname>
<given-names><![CDATA[Roger S.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Alujas Díaz]]></surname>
<given-names><![CDATA[Adrián]]></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 contrib-type="author">
<name>
<surname><![CDATA[Leyva Rodríguez]]></surname>
<given-names><![CDATA[Carlos A.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Betancourt Rodríguez]]></surname>
<given-names><![CDATA[Sergio]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Arcial Carratalá]]></surname>
<given-names><![CDATA[Florencio]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad de Moa Dr. Antonio Núñez Jiménez  ]]></institution>
<addr-line><![CDATA[ Moa]]></addr-line>
<country>Cuba</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidad Central Marta Abreu de Las Villas  ]]></institution>
<addr-line><![CDATA[ Santa Clara]]></addr-line>
<country>Cuba</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>12</month>
<year>2021</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>12</month>
<year>2021</year>
</pub-date>
<volume>11</volume>
<numero>3</numero>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://scielo.sld.cu/scielo.php?script=sci_arttext&amp;pid=S2304-01062021000300006&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://scielo.sld.cu/scielo.php?script=sci_abstract&amp;pid=S2304-01062021000300006&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://scielo.sld.cu/scielo.php?script=sci_pdf&amp;pid=S2304-01062021000300006&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[RESUMEN  Introducción:  La implementación a escala industrial de la producción de los cementos LC3 y de la correspondiente adición mineral activa (LC2) se encuentra limitada porque no existe una adecuada estrategia que permita la identificación y evaluación de los depósitos arcillosos existentes como fuente de materiales cementicios suplementarios (MCS) y a sus limitados recursos reportados. El presente trabajo tiene como objetivo el desarrollo de un procedimiento que permite la identificación y evaluación de depósitos arcillosos para ser empleados como MCS y establecer los parámetros para su adecuada selección.  Métodos:  Se estudiaron cuatro depósitos arcillosos, los cuales se caracterizaron química y mineralógicamente. Las arcillas investigadas se calcinaron a 750 y 850 ºC, y fueron evaluados en su estado anhidro, en pastas y en morteros.  Resultados:  En las arcillas caracterizadas existe un predominio de los minerales arcillosos del grupo de la caolinita, mientras que sus relativamente altos contenidos de hierro limitan su explotación en aplicaciones propias de los caolines industriales. Los productos calcinados muestran una excelente reactividad puzolánica y los aglomerantes presentan un comportamiento similar a los cementos P-35. Conclusiones: Los cuatro depósitos presentan potencialidades para la producción de MCS a escala industrial. El contenido de caolinita, es el factor de mayor influencia sobre la reactividad puzolánica. La presencia de minerales acompañantes térmicamente inestables durante el proceso de calcinación también afecta la reactividad puzolánica. El procedimiento desarrollado constituye una sólida herramienta para la evaluación de las potencialidades de los depósitos arcillosos como fuente de MCS.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[ABSTRACT  Introduction: The industrial scale implementation of the production of LC3 cements and the corresponding active mineral addition (LC2) is limited because there is no adequate strategy that allows for the identification and evaluation of the existing clay deposits as a source of supplementary cementitious materials (MCS) and its scarce reported resources. The goal of this work is to develop a procedure that allows for the identification and evaluation of clay deposits to be used as MCS and to establish the parameters for their suitable selection.  Methods:  Four clay deposits were studied, which were chemically and mineralogically characterized. The clays investigated were calcined at 750 and 850 ºC and were characterized from the chemical point of view and the specific surface, and their pozzolanic reactivity was assessed. The calcined clays were used in the formulation of LC3 cements, which were evaluated in their anhydrous state, in pastes and in mortars.  Results:  In the characterized clays there is a predominance of clay minerals from the kaolinite group, while their relatively high iron content limits their exploitation in applications of industrial kaolins. The calcined products show an excellent pozzolanic reactivity and the binders show a similar behavior to the P-35 cements. Conclusions: The four deposits present potentialities for the production of MCS on an industrial scale. Kaolinite content is the factor with the greatest influence on pozzolanic reactivity. The presence of thermally unstable accompanying minerals during the calcination process also affects pozzolanic reactivity. The procedure developed constitutes a solid tool for evaluating the potentialities of clay deposits as a source of MCS.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[arcillas caoliníticas]]></kwd>
<kwd lng="es"><![CDATA[arcillas calcinadas]]></kwd>
<kwd lng="es"><![CDATA[materiales cementicios suplementarios]]></kwd>
<kwd lng="es"><![CDATA[adición mineral activa LC2]]></kwd>
<kwd lng="es"><![CDATA[cemento de arcilla de base arcillas calcinada y caliza LC3]]></kwd>
<kwd lng="en"><![CDATA[kaolinitic clays]]></kwd>
<kwd lng="en"><![CDATA[calcined clays]]></kwd>
<kwd lng="en"><![CDATA[supplementary cementitious materials]]></kwd>
<kwd lng="en"><![CDATA[active mineral addition LC2]]></kwd>
<kwd lng="en"><![CDATA[limestone calcined clay cement LC3]]></kwd>
</kwd-group>
</article-meta>
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