This paper presents the first paleoenvironmental reconstruction of the last 1,130 a of the Marriaga Swamp in the Atrato River delta in northwestern Colombia. The geochemical analyses of a 220 cm sediment core retrieved from the swamp reveal interesting climatic episodes and sedimentary changes in the last millennium. We split the core into three segments, according to sediment features, organic carbon content (OC), and geological ages. Records show different alternations of humid and dry periods, biological productivity, carbonate precipitation, weathering grade, and high heavy metal concentrations. The segments also concur with the geochemical differences determined by (Zr+Rb)/Sr, Ca/Ti Mn/Fe, OC/Ti, Mg/Ca Ba/Al, Sr/Al, and Ca/Al ratios. The older sequence (between 1,130 ± 90 a and 870 ± 70 a) shows a dry period with intermittent flooding events and high OC production in subareal conditions, followed by a more humid environment between 870 ± 70 a and 530 ± 40 a, with depletion of trace element ratios and OC. The more recent period (530 ± 40 a to present) evinces an environment dominated by the fluvial regime, based on a lower Ca/Al ratio and a rise of OC. The statistical correlations display three main clusters that distinguish among organic-biological productivity, bedrock source components, and heavy metal inputs.
本文对哥伦比亚西北部阿特拉托河三角洲马里亚加沼泽近1130 a的古环境进行了首次重建。对从沼泽中提取的220厘米沉积物岩心的地球化学分析揭示了过去一千年中有趣的气候事件和沉积变化。我们根据沉积物特征、有机碳含量(OC)和地质时代将岩心分成三段。记录显示了不同的干湿交替期、生物生产力、碳酸盐降水、风化等级和高重金属浓度。与(Zr+Rb)/Sr、Ca/Ti Mn/Fe、OC/Ti、Mg/Ca Ba/Al、Sr/Al和Ca/Al比值的地球化学差异一致。较老的层序(1130±90 a ~ 870±70 a)表现为一个干旱期，伴有间歇性洪水事件和亚区域条件下的高OC产量，随后在870±70 a ~ 530±40 a之间的更为湿润的环境，微量元素比例和OC减少。更近的时期(530±40 a至今)，基于较低的Ca/Al比值和升高的OC，证明了一个以河流制度为主的环境。统计相关性显示了有机生物生产力、基岩源成分和重金属投入的三个主要集群。
{"title":"Paleoenvironmental Interpretation of Last Millennium Sediments in the Marriaga Swamp, Atrato Delta, Colombia","authors":"Liliana Betancurth Montes, J. C. Cañón Barriga","doi":"10.18359/rcin.5071","DOIUrl":"https://doi.org/10.18359/rcin.5071","url":null,"abstract":"This paper presents the first paleoenvironmental reconstruction of the last 1,130 a of the Marriaga Swamp in the Atrato River delta in northwestern Colombia. The geochemical analyses of a 220 cm sediment core retrieved from the swamp reveal interesting climatic episodes and sedimentary changes in the last millennium. We split the core into three segments, according to sediment features, organic carbon content (OC), and geological ages. Records show different alternations of humid and dry periods, biological productivity, carbonate precipitation, weathering grade, and high heavy metal concentrations. The segments also concur with the geochemical differences determined by (Zr+Rb)/Sr, Ca/Ti Mn/Fe, OC/Ti, Mg/Ca Ba/Al, Sr/Al, and Ca/Al ratios. The older sequence (between 1,130 ± 90 a and 870 ± 70 a) shows a dry period with intermittent flooding events and high OC production in subareal conditions, followed by a more humid environment between 870 ± 70 a and 530 ± 40 a, with depletion of trace element ratios and OC. The more recent period (530 ± 40 a to present) evinces an environment dominated by the fluvial regime, based on a lower Ca/Al ratio and a rise of OC. The statistical correlations display three main clusters that distinguish among organic-biological productivity, bedrock source components, and heavy metal inputs.","PeriodicalId":31201,"journal":{"name":"Ciencia e Ingenieria Neogranadina","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67852414","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Diana Margarita Hernández Avilés, Tatiana R. Chaparro
Rainwater is a renewable natural resource that has low contamination indexes. In rural areas, access to potable water can become an activity that is not very feasible. It is for this reason that the implementation of a self-sustainable system where rainwater can be treated comes as an alternative to avoid problems related to hydric stress and public health. Based on the above, the objective of this research was to determine the treatments necessary for rainwater to be suitable for different reutilization purposes, being human consumption one of them. Results suggest that natural carbon filters and solar disinfection are the alternatives with the highest elimination of the contaminants evaluated.
{"title":"Tratamiento de agua lluvia con fines de consumo humano","authors":"Diana Margarita Hernández Avilés, Tatiana R. Chaparro","doi":"10.18359/rcin.4409","DOIUrl":"https://doi.org/10.18359/rcin.4409","url":null,"abstract":"Rainwater is a renewable natural resource that has low contamination indexes. In rural areas, access to potable water can become an activity that is not very feasible. It is for this reason that the implementation of a self-sustainable system where rainwater can be treated comes as an alternative to avoid problems related to hydric stress and public health. Based on the above, the objective of this research was to determine the treatments necessary for rainwater to be suitable for different reutilization purposes, being human consumption one of them. Results suggest that natural carbon filters and solar disinfection are the alternatives with the highest elimination of the contaminants evaluated.","PeriodicalId":31201,"journal":{"name":"Ciencia e Ingenieria Neogranadina","volume":"30 1","pages":"97-107"},"PeriodicalIF":0.0,"publicationDate":"2020-12-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41897240","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The status of the road infrastructure affects the social, economic, and political environment of a nation. Evaluation of the pavement surface condition is essential to plan timely and effective interventions. Timely actions avoid operating cost overruns, prevent uncontrolled deterioration and reduce operational and safety inconveniences. The problem raises the concern of studying alternatives to evaluate the status of pavement, for which a large number of investigations on automatic detection of surface flaws in flexible pavements through image processing techniques have been developed. . The objective of this article is to review and analyze these contributions. Based on the review, it was concluded that the performance of this type of systems is determined by two factors: data collection and processing. The analysis presented herein unfolds based on these factors. The development of systems that take advantage of the qualities of different sensors in data acquisition and that integrate the detection and classification of a variety of faults including severity data is considered opportune.
{"title":"Revisión de métodos para la clasificación de fallas superficiales en pavimentos flexibles","authors":"Norma Ximena Ríos Cotazo, Bladimir Bacca Cortés, E. Caicedo bravo, Armando Orobio Quiñónez","doi":"10.18359/rcin.4385","DOIUrl":"https://doi.org/10.18359/rcin.4385","url":null,"abstract":"The status of the road infrastructure affects the social, economic, and political environment of a nation. Evaluation of the pavement surface condition is essential to plan timely and effective interventions. Timely actions avoid operating cost overruns, prevent uncontrolled deterioration and reduce operational and safety inconveniences. The problem raises the concern of studying alternatives to evaluate the status of pavement, for which a large number of investigations on automatic detection of surface flaws in flexible pavements through image processing techniques have been developed. . The objective of this article is to review and analyze these contributions. Based on the review, it was concluded that the performance of this type of systems is determined by two factors: data collection and processing. The analysis presented herein unfolds based on these factors. The development of systems that take advantage of the qualities of different sensors in data acquisition and that integrate the detection and classification of a variety of faults including severity data is considered opportune.","PeriodicalId":31201,"journal":{"name":"Ciencia e Ingenieria Neogranadina","volume":"30 1","pages":"109-127"},"PeriodicalIF":0.0,"publicationDate":"2020-12-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45993451","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Jorge Sánchez Molina, Jessica Sánchez Zúñiga, Carmen Xiomara Díaz Fuentes
El papel de las fachadas es fundamental para determinar el rendimiento energético del edificio. De acuerdo con las propiedades de los elementos constructivos, la transferencia de energía hacia el interior puede controlarse estratégicamente para evitar aumentos en la demanda de energía por los sistemas de acondicionamiento de energía artificial. El desarrollo de productos aislantes puede resolver este problema en gran medida. En el caso de Norte de Santander, existe una industria de arcilla consolidada basada en la calidad de la materia prima. Este documento diseña y valida el comportamiento térmico de dos propuestas de ladrillo ventilado, llamado Diseño ECO. La validación térmica se realizó en el software ANSYS R16 para simular la transferencia y los flujos de calor según la forma y el material. El mejor rendimiento se desarrolló mediante un proceso extruido para determinar las propiedades mecánicas a escala de laboratorio en diferentes mezclas con aditivos tecnológicos de nutrientes. Los resultados muestran que la cámara de aire ventilado puede reducir hasta 7,5 ° C en la temperatura de la superficie interna. Sin embargo, la resistencia de estos nuevos productos se reduce considerablemente en comparación con el ladrillo tradicional multiperforado.
{"title":"Desarrollo de un producto cerámico para la construcción bajo principios de bioclimática y arquitectura sostenible","authors":"Jorge Sánchez Molina, Jessica Sánchez Zúñiga, Carmen Xiomara Díaz Fuentes","doi":"10.18359/rcin.4400","DOIUrl":"https://doi.org/10.18359/rcin.4400","url":null,"abstract":"El papel de las fachadas es fundamental para determinar el rendimiento energético del edificio. De acuerdo con las propiedades de los elementos constructivos, la transferencia de energía hacia el interior puede controlarse estratégicamente para evitar aumentos en la demanda de energía por los sistemas de acondicionamiento de energía artificial. El desarrollo de productos aislantes puede resolver este problema en gran medida. En el caso de Norte de Santander, existe una industria de arcilla consolidada basada en la calidad de la materia prima. Este documento diseña y valida el comportamiento térmico de dos propuestas de ladrillo ventilado, llamado Diseño ECO. La validación térmica se realizó en el software ANSYS R16 para simular la transferencia y los flujos de calor según la forma y el material. El mejor rendimiento se desarrolló mediante un proceso extruido para determinar las propiedades mecánicas a escala de laboratorio en diferentes mezclas con aditivos tecnológicos de nutrientes. Los resultados muestran que la cámara de aire ventilado puede reducir hasta 7,5 ° C en la temperatura de la superficie interna. Sin embargo, la resistencia de estos nuevos productos se reduce considerablemente en comparación con el ladrillo tradicional multiperforado.","PeriodicalId":31201,"journal":{"name":"Ciencia e Ingenieria Neogranadina","volume":"30 1","pages":"129-140"},"PeriodicalIF":0.0,"publicationDate":"2020-12-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48722158","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Modesto Barrios-Fontalvo, C. Tejada-Tovar, Á. Villabona-Ortíz, Fidel Castillo-Mercado, Breiner Ramírez-Arenilla
This paper evaluates the use of cedar tree exudate in chloride penetration and the probability of steel corrosion in reinforced concrete (rc), considering 0.3, 0.5, 0.7, and 0.9 % exudate by cement weight in the mixture at water/cement (w/c) ratios of 0.55 and 0.60. Under these conditions, cylindrical specimens of 4 inches in diameter and 8 inches in height were constructed. The water-soluble chloride content of the extracted concrete powder was measured at 0.5, 1.0, and 2.0 cm depth according to astm C1218/C1218M, while the probability of corrosion was determined by measuring electric potentials with astm C876. A favorable incidence of 0.46 % by weight of concrete was found when using 0.7 % exudate at the w/c ratio of 0.55 at the closest depth to the steel, compared to the 0.55 % target. The probability of steel corrosion is reduced to 10 % with potentials higher than -0.2 V with more prolonged exposure to chlorides.
{"title":"Use of Cedrela odorata Linnaeus Exudate for Inhibiting Corrosion by Chlorides in Reinforced Concrete","authors":"Modesto Barrios-Fontalvo, C. Tejada-Tovar, Á. Villabona-Ortíz, Fidel Castillo-Mercado, Breiner Ramírez-Arenilla","doi":"10.18359/rcin.4423","DOIUrl":"https://doi.org/10.18359/rcin.4423","url":null,"abstract":"This paper evaluates the use of cedar tree exudate in chloride penetration and the probability of steel corrosion in reinforced concrete (rc), considering 0.3, 0.5, 0.7, and 0.9 % exudate by cement weight in the mixture at water/cement (w/c) ratios of 0.55 and 0.60. Under these conditions, cylindrical specimens of 4 inches in diameter and 8 inches in height were constructed. The water-soluble chloride content of the extracted concrete powder was measured at 0.5, 1.0, and 2.0 cm depth according to astm C1218/C1218M, while the probability of corrosion was determined by measuring electric potentials with astm C876. A favorable incidence of 0.46 % by weight of concrete was found when using 0.7 % exudate at the w/c ratio of 0.55 at the closest depth to the steel, compared to the 0.55 % target. The probability of steel corrosion is reduced to 10 % with potentials higher than -0.2 V with more prolonged exposure to chlorides.","PeriodicalId":31201,"journal":{"name":"Ciencia e Ingenieria Neogranadina","volume":"30 1","pages":"9-20"},"PeriodicalIF":0.0,"publicationDate":"2020-12-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47069609","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Edier Vicente Aristizábal Giraldo, Federico José Gómez Cardona, Edwin Fabián García Aristizábal, Juan Carlos Guzmán Martínez
Los sismos constituyen uno de los mayores detonantes de movimientos en masa en el mundo. Diversas metodologías han sido desarrolladas para predecir y evaluar estos fenómenos desde enfoques estadísticos, físicos o combinación de ambos. En el presente estudio se analiza la amenaza por movimientos en masa detonados por sismos en el municipio de Barbosa, ubicado en los Andes colombianos, a través de los dos métodos más implementados: el análisis seudoestático y el método de Newmark, debido a su fácil uso, larga trayectoria y aceptación investigativa en los análisis de equilibrio límite. Los resultados permiten entender la respuesta geomecánica del subsuelo ante sismos en condiciones tanto saturadas como secas. El caso de estudio presentado señala un gran potencial de las metodologías mencionadas como herramientas de análisis de la amenaza de movimientos en masa detonados por sismos en zonas montañosas. Como se ha presentado en diferentes estudios, el porcentaje de áreas inestables se encuentra directamente relacionado con el grado de saturación del terreno y la pendiente. Para el municipio de Barbosa, y utilizando el méto- do de Newmark, el área inestable alcanza el 59% del municipio en condiciones saturadas y 17% en condiciones secas; mientras que utilizando el método seudoestático representan el 22% y 8% del municipio, respectivamente.
{"title":"Análisis de la amenaza por movimientos en masa detonados por sismo en los Andes colombianos, caso de estudio: Barbosa (Antioquia)","authors":"Edier Vicente Aristizábal Giraldo, Federico José Gómez Cardona, Edwin Fabián García Aristizábal, Juan Carlos Guzmán Martínez","doi":"10.18359/rcin.4304","DOIUrl":"https://doi.org/10.18359/rcin.4304","url":null,"abstract":"Los sismos constituyen uno de los mayores detonantes de movimientos en masa en el mundo. Diversas metodologías han sido desarrolladas para predecir y evaluar estos fenómenos desde enfoques estadísticos, físicos o combinación de ambos. En el presente estudio se analiza la amenaza por movimientos en masa detonados por sismos en el municipio de Barbosa, ubicado en los Andes colombianos, a través de los dos métodos más implementados: el análisis seudoestático y el método de Newmark, debido a su fácil uso, larga trayectoria y aceptación investigativa en los análisis de equilibrio límite. Los resultados permiten entender la respuesta geomecánica del subsuelo ante sismos en condiciones tanto saturadas como secas. El caso de estudio presentado señala un gran potencial de las metodologías mencionadas como herramientas de análisis de la amenaza de movimientos en masa detonados por sismos en zonas montañosas. Como se ha presentado en diferentes estudios, el porcentaje de áreas inestables se encuentra directamente relacionado con el grado de saturación del terreno y la pendiente. Para el municipio de Barbosa, y utilizando el méto- \u0000do de Newmark, el área inestable alcanza el 59% del municipio en condiciones saturadas y 17% en condiciones secas; mientras que utilizando el método seudoestático representan el 22% y 8% del municipio, respectivamente.","PeriodicalId":31201,"journal":{"name":"Ciencia e Ingenieria Neogranadina","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-12-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47133955","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Delma Esther Rocha Álvarez, Carol Pérez, Jorge Villanueva
This article refers to the manufacturing of a new environmentally friendly construction material; it mentions concepts of pollution in Colombia where the lack of reutilization of recyclable materials is proven with figures. It bases its objectives and justification on the needs or deficiencies outlined in the document. In the investigation, similar models are carried out where investigations related to the proposed topic are presented. Likewise, there is an evocation of national and international articles and laws supporting the work in this research
{"title":"Material ecológico para construcción en vidrio, arena y poliplásticos (VAPoli)","authors":"Delma Esther Rocha Álvarez, Carol Pérez, Jorge Villanueva","doi":"10.18359/rcin.4643","DOIUrl":"https://doi.org/10.18359/rcin.4643","url":null,"abstract":"This article refers to the manufacturing of a new environmentally friendly construction material; it mentions concepts of pollution in Colombia where the lack of reutilization of recyclable materials is proven with figures. It bases its objectives and justification on the needs or deficiencies outlined in the document. In the investigation, similar models are carried out where investigations related to the proposed topic are presented. Likewise, there is an evocation of national and international articles and laws supporting the work in this research","PeriodicalId":31201,"journal":{"name":"Ciencia e Ingenieria Neogranadina","volume":"30 1","pages":"49-66"},"PeriodicalIF":0.0,"publicationDate":"2020-12-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42102485","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Reconociendo el aporte de la Ingeniería Civil en el crecimiento y desarrollo económico del país, el volumen 30-2 está dedicado a esta temática. En este número, los lectores de la revista Ciencia e Ingeniería Neogranadina podrán encontrar artículos de investigación y revisión en las áreas de geotecnia, estructuras, tratamiento de agua, materiales de construcción, resistencia de materiales, ingeniería ambiental, gestión de pavimentos y construcciones para alojamiento pecuario. En total se publican nueve artículos, de los cuales uno es de revisión y los ocho restantes son de investigación.
认识到土木工程对国家经济增长和发展的贡献，第30-2卷专门讨论这一主题。在本期杂志Ciencia e ingenieria Neogranadina的读者可以找到岩土工程、结构、水处理、建筑材料、材料强度、环境工程、路面管理和牲畜住房建筑等领域的研究和评论文章。本文共发表9篇文章，其中1篇是综述，8篇是研究性的。
{"title":"Editorial","authors":"Elsa Adriana Cárdenas Quiroga","doi":"10.18359/rcin.5407","DOIUrl":"https://doi.org/10.18359/rcin.5407","url":null,"abstract":"Reconociendo el aporte de la Ingeniería Civil en el crecimiento y desarrollo económico del país, el volumen 30-2 está dedicado a esta temática. En este número, los lectores de la revista Ciencia e Ingeniería Neogranadina podrán encontrar artículos de investigación y revisión en las áreas de geotecnia, estructuras, tratamiento de agua, materiales de construcción, resistencia de materiales, ingeniería ambiental, gestión de pavimentos y construcciones para alojamiento pecuario. En total se publican nueve artículos, de los cuales uno es de revisión y los ocho restantes son de investigación.","PeriodicalId":31201,"journal":{"name":"Ciencia e Ingenieria Neogranadina","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-12-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42156530","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Millions of post-consumer tires are not adequately disposed of each year, and thus, are producing an enormous environmental problem in the world. This environmental impact may be reduced when assessing this material as an alternative reinforcement for concrete. It is widely known that the toughness of steel fiber-reinforced concrete is suitably assessed by energy absorption tests on slabs. The purpose of this paper is to show and discuss the results of a research aimed at assessing the mechanical response of concrete slabs reinforced with recycled steel fibers from post-consumer tires in Bogotá, Colombia. The testing program of the study comprised 31 axial compression tests on cylinders, and 15 bending tests on concrete slabs reinforced with nominal dosages of 15, 30, and 60 kg/m3 of industrial steel fibers or recycled fibers obtained from post-consumer tires. Based on the measured response, preliminary design equations are proposed to estimate the mechanical properties of concrete reinforced with recycled steel fibers.
{"title":"Mechanical Properties of Concrete Slabs Reinforced with Recycled Steel Fibers from Post-Consumer Tires in Bogotá, Colombia","authors":"J. Carrillo, C. Diaz","doi":"10.18359/rcin.4412","DOIUrl":"https://doi.org/10.18359/rcin.4412","url":null,"abstract":"Millions of post-consumer tires are not adequately disposed of each year, and thus, are producing an enormous environmental problem in the world. This environmental impact may be reduced when assessing this material as an alternative reinforcement for concrete. It is widely known that the toughness of steel fiber-reinforced concrete is suitably assessed by energy absorption tests on slabs. The purpose of this paper is to show and discuss the results of a research aimed at assessing the mechanical response of concrete slabs reinforced with recycled steel fibers from post-consumer tires in Bogotá, Colombia. The testing program of the study comprised 31 axial compression tests on cylinders, and 15 bending tests on concrete slabs reinforced with nominal dosages of 15, 30, and 60 kg/m3 of industrial steel fibers or recycled fibers obtained from post-consumer tires. Based on the measured response, preliminary design equations are proposed to estimate the mechanical properties of concrete reinforced with recycled steel fibers.","PeriodicalId":31201,"journal":{"name":"Ciencia e Ingenieria Neogranadina","volume":"30 1","pages":"67-79"},"PeriodicalIF":0.0,"publicationDate":"2020-12-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42027269","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Alejandra Sarabia-Guarin, R. Ramírez-Delgado, J. Sánchez-Molina
This study researches the effect of adding coffee husk (ch) and coffee husk ash (cha) as partial feldspar substitutes to the manufacture of enameled ceramic tiles. Clays and other paste additives were characterized using xrd and xrf. The designed prototypes were pressed, dried, and fired at 1,120 °C. The physical (drying and firing shrinkage, apparent density, water absorption) and mechanical (flexion resistance) properties were evaluated and compared with standard fired specimens. Although the physical and mechanical properties of the specimens with 5 and 10 % ch and cha make them suitable for the manufacture of biib ceramic tiles, it was concluded that ch and cha under the working conditions do not replace feldspar in the preparation of enameled ceramic tiles due to surface quality defects.
{"title":"Coffee Husk as Feldspar Substitute in the Manufacture of Enameled Ceramic Tile","authors":"Alejandra Sarabia-Guarin, R. Ramírez-Delgado, J. Sánchez-Molina","doi":"10.18359/rcin.4370","DOIUrl":"https://doi.org/10.18359/rcin.4370","url":null,"abstract":"This study researches the effect of adding coffee husk (ch) and coffee husk ash (cha) as partial feldspar substitutes to the manufacture of enameled ceramic tiles. Clays and other paste additives were characterized using xrd and xrf. The designed prototypes were pressed, dried, and fired at 1,120 °C. The physical (drying and firing shrinkage, apparent density, water absorption) and mechanical (flexion resistance) properties were evaluated and compared with standard fired specimens. Although the physical and mechanical properties of the specimens with 5 and 10 % ch and cha make them suitable for the manufacture of biib ceramic tiles, it was concluded that ch and cha under the working conditions do not replace feldspar in the preparation of enameled ceramic tiles due to surface quality defects.","PeriodicalId":31201,"journal":{"name":"Ciencia e Ingenieria Neogranadina","volume":"30 1","pages":"21-30"},"PeriodicalIF":0.0,"publicationDate":"2020-12-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42647815","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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