Pub Date : 2021-08-01DOI: 10.4067/s0718-50732021000200251
S. Villalobos
Debido a su rapida y economica ejecucion, la solucion geotecnica conocida como muros de soil nailing se utiliza ampliamente para la estabilizacion de taludes y excavaciones del terreno. En la etapa de diseno, la verificacion de la estabilidad externa del muro de soil nailing es uno de los criterios de aceptabilidad mas importantes. El principal objetivo de este trabajo es evaluar la estabilidad externa de muros de soil nailing, considerando la influencia de la variabilidad de su altura y los parametros geomecanicos del suelo in-situ. La metodologia probabilistica de diseno factorial 2k ha sido aplicada para generar 32 experimentos. Un muro de soil nailing vertical, con altura variable, bajo condiciones de carga pseudo-estatica, y ejecutado en suelo residual de roca granitica ha sido utilizado como modelo prototipo. Basandose en el analisis de las observaciones de los 32 experimentos, se han desarrollado tres modelos de regresion, los que pueden ser usados para predecir el valor de los factores de seguridad con realizaciones arbitrarias. Ademas, las observaciones muestran que los factores que mas influencia tienen sobre la estabilidad externa de muros de soil nailing son la altura del muro, la cohesion y el angulo de friccion del suelo in-situ.
{"title":"Regression models and response surfaces to assess the external stability of soil nail walls","authors":"S. Villalobos","doi":"10.4067/s0718-50732021000200251","DOIUrl":"https://doi.org/10.4067/s0718-50732021000200251","url":null,"abstract":"Debido a su rapida y economica ejecucion, la solucion geotecnica conocida como muros de soil nailing se utiliza ampliamente para la estabilizacion de taludes y excavaciones del terreno. En la etapa de diseno, la verificacion de la estabilidad externa del muro de soil nailing es uno de los criterios de aceptabilidad mas importantes. El principal objetivo de este trabajo es evaluar la estabilidad externa de muros de soil nailing, considerando la influencia de la variabilidad de su altura y los parametros geomecanicos del suelo in-situ. La metodologia probabilistica de diseno factorial 2k ha sido aplicada para generar 32 experimentos. Un muro de soil nailing vertical, con altura variable, bajo condiciones de carga pseudo-estatica, y ejecutado en suelo residual de roca granitica ha sido utilizado como modelo prototipo. Basandose en el analisis de las observaciones de los 32 experimentos, se han desarrollado tres modelos de regresion, los que pueden ser usados para predecir el valor de los factores de seguridad con realizaciones arbitrarias. Ademas, las observaciones muestran que los factores que mas influencia tienen sobre la estabilidad externa de muros de soil nailing son la altura del muro, la cohesion y el angulo de friccion del suelo in-situ.","PeriodicalId":369360,"journal":{"name":"Revista Ingeniería de Construcción","volume":"690 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133196284","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}
Pub Date : 2021-08-01DOI: 10.4067/s0718-50732021000200157
O. Contreras, F. Núñez
In recent years, ideas such as green roofs gained importance as an alternative for environmental adaptation of society to new ambient conditions. In Bogota city, the roofs at popular neighborhood represent a potential area for their implementation. This present research discusses how the weight of a green roof impacts a self-construction dwelling unit from a structural capacity demand point of view. Green roof weight is a random variable whose normality was investigated through the Shapiro-Wilk goodness of fit. The magnification factors for this dead-like load come from the Nowak-Collins method using the confidence intervals on the mean weight value. The ATC-40 pushover methodology helped in finding the non-linear behavior of a controlled but similar structure as those found in the popular neighborhoods of Bogota city. According to this methodology, damage caused on these structures due to seismic demand increases by the green roof incorporation. However, damage increase is a function of local soil conditions.
{"title":"Influence of an extensive green roof in the non-linear structural behavior of self - construction households","authors":"O. Contreras, F. Núñez","doi":"10.4067/s0718-50732021000200157","DOIUrl":"https://doi.org/10.4067/s0718-50732021000200157","url":null,"abstract":"In recent years, ideas such as green roofs gained importance as an alternative for environmental adaptation of society to new ambient conditions. In Bogota city, the roofs at popular neighborhood represent a potential area for their implementation. This present research discusses how the weight of a green roof impacts a self-construction dwelling unit from a structural capacity demand point of view. Green roof weight is a random variable whose normality was investigated through the Shapiro-Wilk goodness of fit. The magnification factors for this dead-like load come from the Nowak-Collins method using the confidence intervals on the mean weight value. The ATC-40 pushover methodology helped in finding the non-linear behavior of a controlled but similar structure as those found in the popular neighborhoods of Bogota city. According to this methodology, damage caused on these structures due to seismic demand increases by the green roof incorporation. However, damage increase is a function of local soil conditions.","PeriodicalId":369360,"journal":{"name":"Revista Ingeniería de Construcción","volume":"73 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126453085","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}
Pub Date : 2021-08-01DOI: 10.4067/s0718-50732021000200222
V. Vila, W. Mera, J. Jaramillo
El asfalto ecuatoriano tiene la particularidad de ser proclive al envejecimiento prematuro incidiendo en que los pavimentos asfalticos presenten una insuficiente durabilidad. El objetivo de este trabajo experimental es valorar el efecto que produce en las propiedades del asfalto AC 20, procedente de la Refineria de Esmeraldas, su modificacion con el agente rejuvenecedor Sylvaroad RP-1000; asi como evaluar su incidencia en la calidad de una mezcla asfaltica tipica, sin material fresado, preparada con asfalto sin modificar y modificado con rejuvenecedor. El asfalto utilizado clasifica como PG 64-22 y al ser mezclado con 2.5% en peso del rejuvenecedor, su grado cambio a PG 58-28. Se realizaron estudios adicionales empleando los parametros ΔTc, Glover-Rowe y las temperaturas de transicion, evidenciandose mejoras en los resultados. Luego se diseno una mezcla densa con 5.5% de asfalto; a las briquetas confeccionadas se le aplicaron pruebas de modulo de rigidez, compresion ciclica y fatiga con el equipo NAT. Al emplear asfalto modificado el comportamiento a la fatiga mejoro notablemente. Adicionalmente, se aplico un proceso de envejecimiento en horno a 85°C a ambas mezclas, valorandose el modulo y la fatiga a los 8 dias, que demostraron un buen comportamiento solo en la mezcla con rejuvenecedor.
{"title":"Evaluation of a rejuvenator as an additive in asphalt","authors":"V. Vila, W. Mera, J. Jaramillo","doi":"10.4067/s0718-50732021000200222","DOIUrl":"https://doi.org/10.4067/s0718-50732021000200222","url":null,"abstract":"El asfalto ecuatoriano tiene la particularidad de ser proclive al envejecimiento prematuro incidiendo en que los pavimentos asfalticos presenten una insuficiente durabilidad. El objetivo de este trabajo experimental es valorar el efecto que produce en las propiedades del asfalto AC 20, procedente de la Refineria de Esmeraldas, su modificacion con el agente rejuvenecedor Sylvaroad RP-1000; asi como evaluar su incidencia en la calidad de una mezcla asfaltica tipica, sin material fresado, preparada con asfalto sin modificar y modificado con rejuvenecedor. El asfalto utilizado clasifica como PG 64-22 y al ser mezclado con 2.5% en peso del rejuvenecedor, su grado cambio a PG 58-28. Se realizaron estudios adicionales empleando los parametros ΔTc, Glover-Rowe y las temperaturas de transicion, evidenciandose mejoras en los resultados. Luego se diseno una mezcla densa con 5.5% de asfalto; a las briquetas confeccionadas se le aplicaron pruebas de modulo de rigidez, compresion ciclica y fatiga con el equipo NAT. Al emplear asfalto modificado el comportamiento a la fatiga mejoro notablemente. Adicionalmente, se aplico un proceso de envejecimiento en horno a 85°C a ambas mezclas, valorandose el modulo y la fatiga a los 8 dias, que demostraron un buen comportamiento solo en la mezcla con rejuvenecedor.","PeriodicalId":369360,"journal":{"name":"Revista Ingeniería de Construcción","volume":"13 2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125638588","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}
Pub Date : 2021-08-01DOI: 10.4067/s0718-50732021000200107
Vitor Hugo Salviatto, Heliana Barbosa Fontanele
The main methods for assessing pavement condition do not consider the factors involved in pavement deterioration. Thus, the objective of this research was to develop a current pavement condition index that took into account the factors that lead to deterioration. The index included an assessment of riding comfort, existing distresses, longitudinal slope, drainage aspects and bus traffic volume. The criteria and performance levels were weighed by means of a method known as Measuring Attractiveness by a Categorical Based Evaluation Technique. To be tested and validated, the index developed was applied to 13 Sample Units, and a correlation analysis based on the Fixed-Value Matrix method was performed. In said analysis, a correlation of 0.12 was obtained when all units were considered, and 0.48 when the units with high traffic volume were removed. It was concluded that the proposed method presents a more rigorous assessment of pavement condition, mainly when it comes to distresses and bus traffic.
{"title":"Index for assessing the condition of flexible urban pavements based on a constructivist multicriteria analysis","authors":"Vitor Hugo Salviatto, Heliana Barbosa Fontanele","doi":"10.4067/s0718-50732021000200107","DOIUrl":"https://doi.org/10.4067/s0718-50732021000200107","url":null,"abstract":"The main methods for assessing pavement condition do not consider the factors involved in pavement deterioration. Thus, the objective of this research was to develop a current pavement condition index that took into account the factors that lead to deterioration. The index included an assessment of riding comfort, existing distresses, longitudinal slope, drainage aspects and bus traffic volume. The criteria and performance levels were weighed by means of a method known as Measuring Attractiveness by a Categorical Based Evaluation Technique. To be tested and validated, the index developed was applied to 13 Sample Units, and a correlation analysis based on the Fixed-Value Matrix method was performed. In said analysis, a correlation of 0.12 was obtained when all units were considered, and 0.48 when the units with high traffic volume were removed. It was concluded that the proposed method presents a more rigorous assessment of pavement condition, mainly when it comes to distresses and bus traffic.","PeriodicalId":369360,"journal":{"name":"Revista Ingeniería de Construcción","volume":"93 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129174420","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}
Pub Date : 2021-08-01DOI: 10.4067/s0718-50732021000200173
F. Núñez, D. Ruiz, J. Cortés
Los metodos de analisis dinamico no lineal generalmente proporcionan modelos mas ajustados de la respuesta estructural para fuertes movimientos sismicos. Por ello, se realizo una evaluacion sismica no lineal dinamica de seis edificaciones: dos de 5, dos de 12 y dos de 20 pisos de altura y con una planta regular. El sistema estructural de los edificios fue disenado de acuerdo a la NSR-10 (norma sismo resistente colombiana) y con la microzonificacion sismica de Bogota. Los seis edificios fueron analizados utilizando metodologias no lineales y sometidos a los movimientos sismicos de dos terremotos: el terremoto de Quetame de 2008 y el terremoto de Mesa de los Santos de 2015, ambos registrados en Bogota DC por el RAB (red de acelerometros de Bogota). Utilizando el modulo no lineal de un software de elementos finitos y siguiendo las pautas de FEMA 356, se evaluo la respuesta de los edificios a 81 senales sismicas del terremoto de Mesa de los Santos y 78 del terremoto de Quetame. Las senales incluian tres movimientos de tierra perpendiculares correspondientes a las direcciones norte-sur, este-oeste y vertical. Con los resultados del analisis dinamico no lineal, se evaluaron las rotulas plasticas no lineales de los elementos estructurales de las edificaciones para los dos sismos analizados. Con base en los resultados, se construyeron mapas para mostrar las derivas (distorsiones de entrepiso) en la direccion Y, las derivas en la direccion X y las derivas totales. Asimismo, se verificaron las conexiones en el primer piso, un piso intermedio y el ultimo piso de los edificios analizados. Los resultados sugieren que los edificios de acero tienen un mejor desempeno estructural en comparacion con los edificios de concreto reforzado que tambien fueron analizados (analisis no lineal) con terremotos reales (en suelos blandos de Bogota) en investigaciones anteriores
非线性动力分析方法通常为强地震运动提供更精确的结构响应模型。因此，对6栋建筑进行了动态非线性地震评估:2栋5层，2栋12层，2栋20层，1层常规。建筑的结构体系是根据NSR-10(哥伦比亚抗震标准)和波哥大地震微分区设计的。这六座建筑使用非线性方法进行了分析，并受到了两次地震的地震运动:2008年的Quetame地震和2015年的Mesa de Los Santos地震，这两次地震都是由RAB(波哥大加速度计网络)在波哥大特区记录的。利用有限元软件的非线性模块，遵循FEMA 356的指导方针，评估了建筑对Mesa de los Santos地震81个地震信号和Quetame地震78个地震信号的响应。信号包括三个垂直的土方运动，分别对应南北、东西方向和垂直方向。利用非线性动力分析的结果，对两次地震中建筑物结构构件的非线性塑料球接头进行了评价。在此基础上，绘制了Y方向漂移(层间畸变)、X方向漂移和总漂移的图。此外，还检查了分析建筑的一楼、中间层和顶层的连接情况。结果表明，钢结构建筑与钢筋混凝土建筑相比具有更好的结构性能，钢筋混凝土建筑也在之前的研究中对真实地震(波哥大软土)进行了分析(非线性分析)。
{"title":"Nonlinear dynamic analysis of steel buildings subjected to earthquakes","authors":"F. Núñez, D. Ruiz, J. Cortés","doi":"10.4067/s0718-50732021000200173","DOIUrl":"https://doi.org/10.4067/s0718-50732021000200173","url":null,"abstract":"Los metodos de analisis dinamico no lineal generalmente proporcionan modelos mas ajustados de la respuesta estructural para fuertes movimientos sismicos. Por ello, se realizo una evaluacion sismica no lineal dinamica de seis edificaciones: dos de 5, dos de 12 y dos de 20 pisos de altura y con una planta regular. El sistema estructural de los edificios fue disenado de acuerdo a la NSR-10 (norma sismo resistente colombiana) y con la microzonificacion sismica de Bogota. \u0000Los seis edificios fueron analizados utilizando metodologias no lineales y sometidos a los movimientos sismicos de dos terremotos: el terremoto de Quetame de 2008 y el terremoto de Mesa de los Santos de 2015, ambos registrados en Bogota DC por el RAB (red de acelerometros de Bogota). Utilizando el modulo no lineal de un software de elementos finitos y siguiendo las pautas de FEMA 356, se evaluo la respuesta de los edificios a 81 senales sismicas del terremoto de Mesa de los Santos y 78 del terremoto de Quetame. Las senales incluian tres movimientos de tierra perpendiculares correspondientes a las direcciones norte-sur, este-oeste y vertical. Con los resultados del analisis dinamico no lineal, se evaluaron las rotulas plasticas no lineales de los elementos estructurales de las edificaciones para los dos sismos analizados. Con base en los resultados, se construyeron mapas para mostrar las derivas (distorsiones de entrepiso) en la direccion Y, las derivas en la direccion X y las derivas totales. Asimismo, se verificaron las conexiones en el primer piso, un piso intermedio y el ultimo piso de los edificios analizados. \u0000Los resultados sugieren que los edificios de acero tienen un mejor desempeno estructural en comparacion con los edificios de concreto reforzado que tambien fueron analizados (analisis no lineal) con terremotos reales (en suelos blandos de Bogota) en investigaciones anteriores","PeriodicalId":369360,"journal":{"name":"Revista Ingeniería de Construcción","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132102627","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}
Pub Date : 2021-08-01DOI: 10.4067/s0718-50732021000200197
V. Nieto-Barbosa, R. Cubillos-González, R. Barrios-Salcedo
Los habitantes de las ciudades en Sur America enfrentan un disconfort termico al interior de las edificaciones como consecuencia del cambio climatico, situacion que afecta directamente su salud. Como respuesta a este tema se considera el Diseno Resiliente. El objetivo del articulo es evaluar las caracteristicas de diseno resiliente que responden a la necesidad de confort termico en la vivienda social en atencion al efecto del cambio climatico. Esto se realizo a traves de una fase teorica y una empirica en dos ciudades suramericanas con caracteristicas climaticas opuestas: Passo Fundo en Brasil y Tunja en Colombia. Como resultado se encontro que el BTC es una opcion viable solo para climas con condiciones particulares debido a sus propiedades tanto termicas como ambientales segun estrategias de ganancia directa de calor que tienden a ser resilientes y se ajustan mejor a un diseno bioclimatico en las ciudades. Teniendo en cuenta lo anterior se concluyo que la envolvente juega un papel fundamental en el diseno resiliente en funcion del confort termico.
{"title":"Resilient Design Aspects Applied to the Envelope that Determine Thermal Comfort in Social Housing","authors":"V. Nieto-Barbosa, R. Cubillos-González, R. Barrios-Salcedo","doi":"10.4067/s0718-50732021000200197","DOIUrl":"https://doi.org/10.4067/s0718-50732021000200197","url":null,"abstract":"Los habitantes de las ciudades en Sur America enfrentan un disconfort termico al interior de las edificaciones como consecuencia del cambio climatico, situacion que afecta directamente su salud. Como respuesta a este tema se considera el Diseno Resiliente. El objetivo del articulo es evaluar las caracteristicas de diseno resiliente que responden a la necesidad de confort termico en la vivienda social en atencion al efecto del cambio climatico. Esto se realizo a traves de una fase teorica y una empirica en dos ciudades suramericanas con caracteristicas climaticas opuestas: Passo Fundo en Brasil y Tunja en Colombia. Como resultado se encontro que el BTC es una opcion viable solo para climas con condiciones particulares debido a sus propiedades tanto termicas como ambientales segun estrategias de ganancia directa de calor que tienden a ser resilientes y se ajustan mejor a un diseno bioclimatico en las ciudades. Teniendo en cuenta lo anterior se concluyo que la envolvente juega un papel fundamental en el diseno resiliente en funcion del confort termico.","PeriodicalId":369360,"journal":{"name":"Revista Ingeniería de Construcción","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129330341","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}
Pub Date : 2021-04-30DOI: 10.4067/S0718-50732021000100071
P. W. C. Arredondo, C. Lazo, Angel Antonio Ruiz Pico
The present research work is carried out using the experimental study to evaluate the concrete made with Aggregates of the Quarry with Addition of Nanosilica containing micro-fine nanoparticles of amorphous silica dioxide (Si O 2 ). Nanosilica has pozzolanic properties that, upon contact with water, reacts with hydrated cement to form more particles of C-S-H (gel), which reduces porosity by partially filling the pores to refine the structure and therefore gives us greater compressive strength. The recommendation of this study is to implement low-cost, low-rise housing construction. The microstructure properties of the cement paste are improved with the addition of Nanosilica. Nanoparticles have high specific surface areas, and their surfaces are very active; an intense pozzolanic reaction between Nanosilica and CH, would accelerate the pozzolanic reactions between SIO 2 and water molecules. Therefore, the smaller the pore volume, the higher the compressive strength and water absorption capacity of Nanosilica-modified pastes results. The volume of the pores was reduced along with the increase of the Nanosilica dose. The cement and sand mixture without Nanosilica after 7 days of curing, shows a porous structure.
本文的研究工作是通过实验研究来评价在采石场骨料中添加纳米二氧化硅(Si O 2)对混凝土的影响。纳米二氧化硅具有火山灰性质，与水接触后，与水化水泥反应形成更多的C-S-H(凝胶)颗粒，通过部分填充孔隙来减少孔隙率，从而改善结构，从而提高抗压强度。本研究建议推行低成本、低层住宅建设。纳米二氧化硅的加入改善了水泥浆体的微观结构性能。纳米粒子具有很高的比表面积，并且它们的表面非常活跃;纳米二氧化硅与CH之间剧烈的火山灰反应，会加速二氧化硅与水分子之间的火山灰反应。因此，孔隙体积越小，纳米硅改性膏体的抗压强度和吸水能力越高。孔隙体积随纳米二氧化硅剂量的增加而减小。不含纳米二氧化硅的水泥砂混合物在养护7天后呈现多孔结构。
{"title":"Optimization of the concrete through the addition of nanosilice, using aggregates of the cantera de Añashuayco de Arequipa","authors":"P. W. C. Arredondo, C. Lazo, Angel Antonio Ruiz Pico","doi":"10.4067/S0718-50732021000100071","DOIUrl":"https://doi.org/10.4067/S0718-50732021000100071","url":null,"abstract":"The present research work is carried out using the experimental study to evaluate the concrete made with Aggregates of the Quarry with Addition of Nanosilica containing micro-fine nanoparticles of amorphous silica dioxide (Si O 2 ). Nanosilica has pozzolanic properties that, upon contact with water, reacts with hydrated cement to form more particles of C-S-H (gel), which reduces porosity by partially filling the pores to refine the structure and therefore gives us greater compressive strength. The recommendation of this study is to implement low-cost, low-rise housing construction. The microstructure properties of the cement paste are improved with the addition of Nanosilica. Nanoparticles have high specific surface areas, and their surfaces are very active; an intense pozzolanic reaction between Nanosilica and CH, would accelerate the pozzolanic reactions between SIO 2 and water molecules. Therefore, the smaller the pore volume, the higher the compressive strength and water absorption capacity of Nanosilica-modified pastes results. The volume of the pores was reduced along with the increase of the Nanosilica dose. The cement and sand mixture without Nanosilica after 7 days of curing, shows a porous structure.","PeriodicalId":369360,"journal":{"name":"Revista Ingeniería de Construcción","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-04-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130480113","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}
Pub Date : 2020-12-01DOI: 10.4067/s0718-50732020000300287
D. Nurtanto, I. Junaidi, W. Wahyuningtyas, W. Yunarni
{"title":"Comparación de la adición de cenizas de cascarilla de arroz y cenizas de tejas a cemento de geopolímero en base a cenizas volantes con cemento Portland","authors":"D. Nurtanto, I. Junaidi, W. Wahyuningtyas, W. Yunarni","doi":"10.4067/s0718-50732020000300287","DOIUrl":"https://doi.org/10.4067/s0718-50732020000300287","url":null,"abstract":"","PeriodicalId":369360,"journal":{"name":"Revista Ingeniería de Construcción","volume":"12 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127538824","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}
Pub Date : 2020-12-01DOI: 10.4067/S0718-50732020000300322
J. S. D. Melo, J. Villena
This article shows the results of a study on the evaluation of the use of the TDI (Traffic Densification Index) for the prediction of the behavior of a conventional asphalt mixture and two nano-modified asphalt mixtures (one with 2% of carbon nanotubes, CNTs, and another with 3% of organophilic nanoclay, NA) against permanent deformation. The mixtures were designed with equivalent granulometries and different asphalt binders (a conventional and two nano-modified binders). The design of the mixtures was made according to the Superpave method, and the TDI of the mixture was determined from the curves obtained in the compaction test (%Gmm vs number of cycles). For each mixture under study, two slabs measuring 50 x 18 x 5 cm were compacted on the BBPAC slabs compactor of IFSTTAR (Institut Francais des Sciences et Technologies des Transports, de L'Amenagement et des Reseaux). These slabs were subsequently subjected to the permanent deformation test in the French traffic simulator, Orniereur. The TDI obtained was compared with the performance of the mixtures in the permanent deformation test. The results obtained show that the TDI was not effective in predicting the behavior, in terms of permanent deformation, of asphalt mixtures with asphalt binders different from the conventional binder (nano-modified).
本文展示了一项使用TDI(交通密度指数)来预测传统沥青混合料和两种纳米改性沥青混合料(一种含有2%的碳纳米管，CNTs，另一种含有3%的亲有机纳米粘土，NA)抵抗永久变形行为的研究结果。设计了具有等效粒度和不同沥青粘合剂(一种常规粘合剂和两种纳米改性粘合剂)的混合料。根据Superpave方法设计了混合料，并根据压实试验得到的曲线(%Gmm与循环次数)确定了混合料的TDI。对于所研究的每种混合物，两块尺寸为50 x 18 x 5厘米的板在IFSTTAR (Institut Francais des Sciences et Technologies des transport, de L' management et des Reseaux)的BBPAC板压实机上压实。这些板随后在法国交通模拟器Orniereur中进行了永久变形试验。将所得的TDI与混合料的永久变形性能进行了比较。结果表明，TDI在预测沥青混合料的永久变形行为方面并不能有效地预测与常规粘结剂(纳米改性)不同的沥青混合料的永久变形行为。
{"title":"Evaluación de la efectividad del uso del índice TDI (Traffic Densification Index) para la predicción del comportamiento de las mezclas asfálticas nanomodificadas frente a la deformación permanente","authors":"J. S. D. Melo, J. Villena","doi":"10.4067/S0718-50732020000300322","DOIUrl":"https://doi.org/10.4067/S0718-50732020000300322","url":null,"abstract":"This article shows the results of a study on the evaluation of the use of the TDI (Traffic Densification Index) for the prediction of the behavior of a conventional asphalt mixture and two nano-modified asphalt mixtures (one with 2% of carbon nanotubes, CNTs, and another with 3% of organophilic nanoclay, NA) against permanent deformation. The mixtures were designed with equivalent granulometries and different asphalt binders (a conventional and two nano-modified binders). The design of the mixtures was made according to the Superpave method, and the TDI of the mixture was determined from the curves obtained in the compaction test (%Gmm vs number of cycles). For each mixture under study, two slabs measuring 50 x 18 x 5 cm were compacted on the BBPAC slabs compactor of IFSTTAR (Institut Francais des Sciences et Technologies des Transports, de L'Amenagement et des Reseaux). These slabs were subsequently subjected to the permanent deformation test in the French traffic simulator, Orniereur. The TDI obtained was compared with the performance of the mixtures in the permanent deformation test. The results obtained show that the TDI was not effective in predicting the behavior, in terms of permanent deformation, of asphalt mixtures with asphalt binders different from the conventional binder (nano-modified).","PeriodicalId":369360,"journal":{"name":"Revista Ingeniería de Construcción","volume":"65 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124523652","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}
Pub Date : 2020-12-01DOI: 10.4067/S0718-50732020000300308
O. Zhovkva
Originality/value: Energy efficiency and environmental friendliness, as important principles of sustainability for multifunctional complexes, are here considered in the context of the international experience, enabling an identification of the main aspects that are applicable when designing such buildings in Ukraine. Purpose: The purpose of this article is to study the principles of improving energy efficiency and environmental friendliness of multifunctional complexes in Ukraine and thereby enrich the national experience in designing sustainable architecture. Results: On the basis of the study, scientific principles and recommendations are developed that contribute to improving the energy efficiency and environmental friendliness of such complexes. Conclusion: It is concluded that the use of alternative energy sources can cover at least 15-20% of the total energy consumption, and by optimizing the plan it is possible to increase the energy efficiency of a building by up to 14%.
{"title":"Los principios de eficiencia energética y respeto al medio ambiente para complejos multifuncionales","authors":"O. Zhovkva","doi":"10.4067/S0718-50732020000300308","DOIUrl":"https://doi.org/10.4067/S0718-50732020000300308","url":null,"abstract":"Originality/value: Energy efficiency and environmental friendliness, as important principles of sustainability for multifunctional complexes, are here considered in the context of the international experience, enabling an identification of the main aspects that are applicable when designing such buildings in Ukraine. Purpose: The purpose of this article is to study the principles of improving energy efficiency and environmental friendliness of multifunctional complexes in Ukraine and thereby enrich the national experience in designing sustainable architecture. Results: On the basis of the study, scientific principles and recommendations are developed that contribute to improving the energy efficiency and environmental friendliness of such complexes. Conclusion: It is concluded that the use of alternative energy sources can cover at least 15-20% of the total energy consumption, and by optimizing the plan it is possible to increase the energy efficiency of a building by up to 14%.","PeriodicalId":369360,"journal":{"name":"Revista Ingeniería de Construcción","volume":"24 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125924611","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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