En la búsqueda de asumir métodos que brinden un mejor confort en el sistema de vivienda, éstos requieren de mejores prestaciones estructurales en las edificaciones actuales. Las prácticas constructivas en la región se han ido desprestigiando con el paso del tiempo, concibiendo edificaciones vulnerables, que dejan expuesto a quienes las habitan. El objetivo de esta investigación fue analizar de forma integral las características técnicas, constructivas y de diseño de losas de concreto armado, en su implementación como estructura de soporte para techos verdes en la ciudad de Tuxtla Gutiérrez, Chiapas, México. Para realizar el análisis se consideraron las propiedades intrínsecas del miembro de soporte (losas), el estado actual en las que estas se encuentran y su diseño bajo regímenes de durabilidad. Tras realizar la investigación se encontró que los espesores de la losa y las cuantías de acero son menores para claros promedio, según lo estipulado por las normas técnicas correspondientes. Los daños por corrosión del acero son esperados y se encuentran bajo un régimen de diseño inadecuado, aunado a la deficiencia durante el proceso constructivo. Las construcciones analizadas y desarrolladas por procesos de construcción formal o de autoconstrucción evidencian patologías similares. La falta de centros de capacitación para los propietarios y los obreros que adopten los métodos de autoconstrucción, así como el poco rigor de las autoridades en el cumplimiento de los reglamentos de construcción se han convertido en una brecha del conocimiento clave. Finalmente, es poco probable la implementación de techos verdes en estas estructuras sin antes realizar cambios significativos en toda la construcción.
{"title":"ANALYSIS FOR IMPLEMENTING GREEN ROOFS ON REINFORCED CONCRETE SLABS. A CASE STUDY IN THE CITY OF TUXTLA GUTIERREZ, CHIAPAS, MEXICO","authors":"Víctor Manuel Sánchez Trujillo","doi":"10.7764/ric.00013.21","DOIUrl":"https://doi.org/10.7764/ric.00013.21","url":null,"abstract":"En la búsqueda de asumir métodos que brinden un mejor confort en el sistema de vivienda, éstos requieren de mejores prestaciones estructurales en las edificaciones actuales. Las prácticas constructivas en la región se han ido desprestigiando con el paso del tiempo, concibiendo edificaciones vulnerables, que dejan expuesto a quienes las habitan. El objetivo de esta investigación fue analizar de forma integral las características técnicas, constructivas y de diseño de losas de concreto armado, en su implementación como estructura de soporte para techos verdes en la ciudad de Tuxtla Gutiérrez, Chiapas, México. Para realizar el análisis se consideraron las propiedades intrínsecas del miembro de soporte (losas), el estado actual en las que estas se encuentran y su diseño bajo regímenes de durabilidad. Tras realizar la investigación se encontró que los espesores de la losa y las cuantías de acero son menores para claros promedio, según lo estipulado por las normas técnicas correspondientes. Los daños por corrosión del acero son esperados y se encuentran bajo un régimen de diseño inadecuado, aunado a la deficiencia durante el proceso constructivo. Las construcciones analizadas y desarrolladas por procesos de construcción formal o de autoconstrucción evidencian patologías similares. La falta de centros de capacitación para los propietarios y los obreros que adopten los métodos de autoconstrucción, así como el poco rigor de las autoridades en el cumplimiento de los reglamentos de construcción se han convertido en una brecha del conocimiento clave. Finalmente, es poco probable la implementación de techos verdes en estas estructuras sin antes realizar cambios significativos en toda la construcción.","PeriodicalId":369360,"journal":{"name":"Revista Ingeniería de Construcción","volume":"40 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131690902","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}
P. Ojha, P. Singh, B. Singh, A. Singh, A. Sagar, R. Yadav
The paper presents the statistical analysis on the compressive strength of concrete with strength ranging from 30 MPa to 130 MPa. To obtain these concrete strengths, concrete mixes with virgin aggregates were prepared with four different wate r to cementitious content (w/c) ratios i.e., 0.45, 0.36, 0.24, and 0.18. With w/c ratio of 0.45, a mix is also designed using recycled construction and demolition coarse aggregate to compare statistical characteristics with respect to concrete made using virgin aggregates. The presented statistical analysis includes measure of central tendency, dispersion of the data, distribution shape properties, and precision of the mean. A normal and a log-normal distribution has been established and validated for the experimental data set of all the mixes. A correlation has also been established for the compressive strength of 100mm cube and 150mm cube. Analysis shows an increase in dispersion of data with increase in the mean compressive strength of the mix. The mix with Construction and demolition waste aggregate shows a higher standard deviation than the mix with virgin aggregates at the same w/c ratio. The correlation curve for the compressive strength of 100 mm and 150 mm size cubes, shows a conversion factor of 1.04, suggesting an insignificant difference of the compressive strength values of 100 mm and 150 mm cubes for the mix studied.
{"title":"Statistical Characteristics of compressive strength of Normal & High strength concrete and concrete made with recycled aggregate","authors":"P. Ojha, P. Singh, B. Singh, A. Singh, A. Sagar, R. Yadav","doi":"10.7764/ric.00041.21","DOIUrl":"https://doi.org/10.7764/ric.00041.21","url":null,"abstract":"The paper presents the statistical analysis on the compressive strength of concrete with strength ranging from 30 MPa to 130 MPa. To obtain these concrete strengths, concrete mixes with virgin aggregates were prepared with four different wate r to cementitious content (w/c) ratios i.e., 0.45, 0.36, 0.24, and 0.18. With w/c ratio of 0.45, a mix is also designed using recycled construction and demolition coarse aggregate to compare statistical characteristics with respect to concrete made using virgin aggregates. The presented statistical analysis includes measure of central tendency, dispersion of the data, distribution shape properties, and precision of the mean. A normal and a log-normal distribution has been established and validated for the experimental data set of all the mixes. A correlation has also been established for the compressive strength of 100mm cube and 150mm cube. Analysis shows an increase in dispersion of data with increase in the mean compressive strength of the mix. The mix with Construction and demolition waste aggregate shows a higher standard deviation than the mix with virgin aggregates at the same w/c ratio. The correlation curve for the compressive strength of 100 mm and 150 mm size cubes, shows a conversion factor of 1.04, suggesting an insignificant difference of the compressive strength values of 100 mm and 150 mm cubes for the mix studied.","PeriodicalId":369360,"journal":{"name":"Revista Ingeniería de Construcción","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128944699","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}
Photocatalytic mortar with TiO2 leads to a reduction in air pollution due to vehicle emissions. For this purpose, the experimental method was used, which consisted of the preparation of mortars with the same proportion of 1: 4, a strength of 145 kg / cm2 and with different percentages of titanium dioxide (0% and 10%), which were evaluated under the same conditions through the following tests: Quantity of polluting gases, compressive strength and photocatalytic capacity. The results obtained—reduction of carbon dioxide by 97.9%, hydrogen sulfide by 72.9%, sulfur dioxide by 67.2%, nitrogen monoxide by 63.4%, carbon monoxide by 40.5% and oxygen recovery by 7.7%—confirmed the performance of the photocatalytic process through titanium dioxide (TiO2) in terms of an improvement in air quality, and the reduction of colorants, rhodamine by 89.10% and methylene blue 53.06% confirmed its self-cleaning capacity, thus improving the reduction of air pollution.
二氧化钛光催化砂浆可以减少车辆排放造成的空气污染。为此，采用实验方法，制备相同比例为1:4、强度为145 kg / cm2、二氧化钛含量(0%和10%)不同的砂浆，在相同条件下通过以下测试来评价:污染气体量、抗压强度和光催化能力。结果表明:二氧化碳还原率97.9%，硫化氢还原率72.9%，二氧化硫还原率67.2%，一氧化氮还原率63.4%，一氧化碳还原率40.5%，氧气回收率7.7%，证实了二氧化钛(TiO2)光催化工艺在改善空气质量方面的性能;着色剂罗丹明还原率89.10%，亚甲基蓝还原率53.06%，证实了其自净能力，从而提高了空气污染的减量化。
{"title":"PHOTOCATALYTIC MORTAR WITH TIO2 FOR THE REDUCTION OF AIR POLLUTANTS PRODUCED BY VEHICULAR EMISSIONS","authors":"Edwin Jhon Aquise, Katherine Lissette Chirinos Peralta","doi":"10.7764/ric.00014.21","DOIUrl":"https://doi.org/10.7764/ric.00014.21","url":null,"abstract":"Photocatalytic mortar with TiO2 leads to a reduction in air pollution due to vehicle emissions. For this purpose, the experimental method was used, which consisted of the preparation of mortars with the same proportion of 1: 4, a strength of 145 kg / cm2 and with different percentages of titanium dioxide (0% and 10%), which were evaluated under the same conditions through the following tests: Quantity of polluting gases, compressive strength and photocatalytic capacity. The results obtained—reduction of carbon dioxide by 97.9%, hydrogen sulfide by 72.9%, sulfur dioxide by 67.2%, nitrogen monoxide by 63.4%, carbon monoxide by 40.5% and oxygen recovery by 7.7%—confirmed the performance of the photocatalytic process through titanium dioxide (TiO2) in terms of an improvement in air quality, and the reduction of colorants, rhodamine by 89.10% and methylene blue 53.06% confirmed its self-cleaning capacity, thus improving the reduction of air pollution.","PeriodicalId":369360,"journal":{"name":"Revista Ingeniería de Construcción","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127502025","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}
C. A. Sakamoto, C. Fioriti, L. Pagoto, J. Akasaki, J. L. Pinheiro Melges
This paper evaluated the behavioural performance to coating mortar water with rubberized tyres. #0.60 mm and #1.19 mm grain sizes have been used with the incorporation of 10 and 20% (in volume), replacing the small units. The methodology has elapsed with capillary and drying tests; humidification and drying procedures with mass control, infrared thermography and measurement of humidity. The results indicated that in capillarity and drying the trace A20F (#0.60 mm particle size and incorporation of 20%) had have a low absorption rate and helped in the process of water disposal. In the humidification and drying process, both active as well as passive, the rubber possibly blocks the pores of mass, for the grain traits size #0.60 mm (A10F and primarily A20F) have proven easy to lose water, suggesting that the majority of water absorbed would be concentrated on the surface part of the composite.
评价了橡胶轮胎涂覆砂浆水的性能。0.60毫米和1.19毫米的颗粒尺寸已被使用，加入10%和20%(体积)，取代小单位。该方法已经过毛细管和干燥试验;加湿和干燥程序与质量控制，红外热成像和测量湿度。结果表明，在毛细和干燥过程中，微量A20F(粒径0.60 mm，掺量20%)的吸收率较低，有利于水的处理。在加湿和干燥过程中，无论是主动还是被动，橡胶都可能阻塞质量孔，因为粒径为0.60 mm (A10F，主要是A20F)的颗粒性状容易失水，这表明大部分被吸收的水将集中在复合材料的表面部分。
{"title":"Mixed coating mortars using tire rubber: performance in the face of water","authors":"C. A. Sakamoto, C. Fioriti, L. Pagoto, J. Akasaki, J. L. Pinheiro Melges","doi":"10.7764/ric.00060.21","DOIUrl":"https://doi.org/10.7764/ric.00060.21","url":null,"abstract":"This paper evaluated the behavioural performance to coating mortar water with rubberized tyres. #0.60 mm and #1.19 mm grain sizes have been used with the incorporation of 10 and 20% (in volume), replacing the small units. The methodology has elapsed with capillary and drying tests; humidification and drying procedures with mass control, infrared thermography and measurement of humidity. The results indicated that in capillarity and drying the trace A20F (#0.60 mm particle size and incorporation of 20%) had have a low absorption rate and helped in the process of water disposal. In the humidification and drying process, both active as well as passive, the rubber possibly blocks the pores of mass, for the grain traits size #0.60 mm (A10F and primarily A20F) have proven easy to lose water, suggesting that the majority of water absorbed would be concentrated on the surface part of the composite.","PeriodicalId":369360,"journal":{"name":"Revista Ingeniería de Construcción","volume":"16 3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124477891","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}
Ronal Alex Mauricio Villarrial, Marlon Gaston Farfan Cordova
This research was conducted to determine the effect of the scallop shell lime (SSL) on the compressive strength of concrete made with Portland cement type Ico and natural aggregates from a quarry, where SSL was added at 3%, 4% and 5%. The physical and mechanical characteristics of the aggregates were determined based on the N.T.P. 400.037/ASTM C22 standard, and the mix design was carried out through the ACI method. The SSL was used due to the high calcium content present in the valve. Standard concrete controls were prepared and cured by adding 3%, 4% and 5% SSL (339.0183/ASTM C192M), which were analyzed at 7, 14 and 28 days of curing. The results showed that the compressive strength at 28 days was 242.63 kg/cm2 when 3% SSL was added, increasing with respect to the standard control by 16%. With the addition of 4% SSL, the maximum strength reached was 245.25 kg/cm2, and with 5%, the compressive strength reached was 261.17 kg/cm2, increasing by 24%. In conclusion, the SSL positively affects the increase of concrete strength, and the percentage with the highest incidence is 5%.
{"title":"STRUCTURAL CONCRETE MODIFIED WITH SCALLOP SHELL LIME","authors":"Ronal Alex Mauricio Villarrial, Marlon Gaston Farfan Cordova","doi":"10.7764/ric.00010.21","DOIUrl":"https://doi.org/10.7764/ric.00010.21","url":null,"abstract":"This research was conducted to determine the effect of the scallop shell lime (SSL) on the compressive strength of concrete made with Portland cement type Ico and natural aggregates from a quarry, where SSL was added at 3%, 4% and 5%. The physical and mechanical characteristics of the aggregates were determined based on the N.T.P. 400.037/ASTM C22 standard, and the mix design was carried out through the ACI method. The SSL was used due to the high calcium content present in the valve. Standard concrete controls were prepared and cured by adding 3%, 4% and 5% SSL (339.0183/ASTM C192M), which were analyzed at 7, 14 and 28 days of curing. The results showed that the compressive strength at 28 days was 242.63 kg/cm2 when 3% SSL was added, increasing with respect to the standard control by 16%. With the addition of 4% SSL, the maximum strength reached was 245.25 kg/cm2, and with 5%, the compressive strength reached was 261.17 kg/cm2, increasing by 24%. In conclusion, the SSL positively affects the increase of concrete strength, and the percentage with the highest incidence is 5%.","PeriodicalId":369360,"journal":{"name":"Revista Ingeniería de Construcción","volume":"18 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121987427","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}
D. Guamán Lozada, A. Rodríguez Pinos, C. Santiana, B. Yyuquilema
One of the most common products in the construction industry is brick due to its advantages over other building materials such as blocks. In developing countries like Ecuador, brick is handcrafted and is the source of income for thousands of families. These bricks lack a systematized process that optimizes resources to make a brick that meets local regulations. This study evaluates the use of the different raw materials used in production through experimental designs to determine the amount of optimal components locally available (“White Clay,” “Black Clay,” “Water”) and achieve the maximum compressive strength in dry-pressed ceramic bricks. This research also identifies the behavior of the compressive strength based on the compaction pressure in the molding stage, concluding that the model that best fits the behavior is a quadratic model, and from the trace plot, it was observed that compared with “White Clay,” “Black Clay” contributes further to the brick strength. The optimal amount of components to meet the 6 MPa pressure standard required in the brick was 5% water, 85% “Black Clay” and 10% “White Clay.” The pressure value required in the compaction stage was 4.9Mpa (712psi,) and greater strength can be achieved by only adding “Black Clay” and water.
{"title":"Experimental design for the optimization of dry-pressed ceramic bricks (Dry-Press)","authors":"D. Guamán Lozada, A. Rodríguez Pinos, C. Santiana, B. Yyuquilema","doi":"10.7764/ric.00036.21","DOIUrl":"https://doi.org/10.7764/ric.00036.21","url":null,"abstract":"One of the most common products in the construction industry is brick due to its advantages over other building materials such as blocks. In developing countries like Ecuador, brick is handcrafted and is the source of income for thousands of families. These bricks lack a systematized process that optimizes resources to make a brick that meets local regulations. This study evaluates the use of the different raw materials used in production through experimental designs to determine the amount of optimal components locally available (“White Clay,” “Black Clay,” “Water”) and achieve the maximum compressive strength in dry-pressed ceramic bricks. This research also identifies the behavior of the compressive strength based on the compaction pressure in the molding stage, concluding that the model that best fits the behavior is a quadratic model, and from the trace plot, it was observed that compared with “White Clay,” “Black Clay” contributes further to the brick strength. The optimal amount of components to meet the 6 MPa pressure standard required in the brick was 5% water, 85% “Black Clay” and 10% “White Clay.” The pressure value required in the compaction stage was 4.9Mpa (712psi,) and greater strength can be achieved by only adding “Black Clay” and water.","PeriodicalId":369360,"journal":{"name":"Revista Ingeniería de Construcción","volume":"18 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121573668","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}
Flavio R. Durón González, Luis Arturo Rivas Tovar, Magali Cárdenas Tapia
The objective is to evaluate 22 time and 12 cost forecasting methods based on Earned Value (EVM/ES) under three assumptions of future performance and in terms of the opportunity, accuracy, and stability of the forecasts. Little attention has been paid in the literature to future performance assumptions and evaluation under these parameters. Method: A total of 6,951 entry data points were used applying statistical measures of error and dispersion based on empirical evidence from 34 hospital construction projects in Mexico. Findings: Using contractor payment estimates as Actual Cost (AC), the more predictive time forecasting methods are those under the assumption that future performance will be as planned and, for cost, under the SPI(t) Schedule Performance Index. Relevance: The research shows the conditions under which the diverse methods offer timely and realistic predictions to be used as a reference in the monitoring and control of hospital construction projects. The limitation of the research consists of using durations and costs from completed projects without considering the possible changes formalized in contractual modifications throughout project’s execution. Future research using EVM/ES input data from the project owner's perspective is suggested.
{"title":"Evaluación de métodos de pronóstico EVM/ES en proyectos de construcción hospitalaria","authors":"Flavio R. Durón González, Luis Arturo Rivas Tovar, Magali Cárdenas Tapia","doi":"10.7764/ric.000243.21","DOIUrl":"https://doi.org/10.7764/ric.000243.21","url":null,"abstract":"The objective is to evaluate 22 time and 12 cost forecasting methods based on Earned Value (EVM/ES) under three assumptions of future performance and in terms of the opportunity, accuracy, and stability of the forecasts. Little attention has been paid in the literature to future performance assumptions and evaluation under these parameters. Method: A total of 6,951 entry data points were used applying statistical measures of error and dispersion based on empirical evidence from 34 hospital construction projects in Mexico. Findings: Using contractor payment estimates as Actual Cost (AC), the more predictive time forecasting methods are those under the assumption that future performance will be as planned and, for cost, under the SPI(t) Schedule Performance Index. Relevance: The research shows the conditions under which the diverse methods offer timely and realistic predictions to be used as a reference in the monitoring and control of hospital construction projects. The limitation of the research consists of using durations and costs from completed projects without considering the possible changes formalized in contractual modifications throughout project’s execution. Future research using EVM/ES input data from the project owner's perspective is suggested.","PeriodicalId":369360,"journal":{"name":"Revista Ingeniería de Construcción","volume":"28 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114158213","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}
Este estudio evalúa las características de la durabilidad del ferrocemento mezclado con mortero de geopolímeros después de ser sometido al fuego. El ferrocemento fue preparado con mortero de geopolímeros y se comparó con el ferrocemento convencional preparado solo con mortero de cemento. Previamente, se estandarizó la concentración molar de la solución de hidróxido de sodio usada para preparar el mortero de geopolímeros mediante la resistencia residual de los cubos de mortero preparados con diversas concentraciones de NaOH. Se determinó y comparó la resistencia residual a flexión de probetas de hormigón preparadas con diferentes porcentajes en volumen (1,5%, 1,8% y 2,1%) de ferro-geopolímeros y ferrocemento, las que luego fueron sometidas durante dos horas a tres niveles de temperatura entre los 300°C y 900°C. Además, probetas con los mismos porcentajes en volumen fueron expuestas a temperaturas sobre los 900°C con el objetivo de determinar su resistencia residual al impacto. Se determinaron las características de la resistencia al fuego de las probetas en términos de Resistencia residual a flexión, resistencia residual al impacto y pérdida de peso. En todos los aspectos, las probetas preparadas con ferro-geopolímeros mostraron un comportamiento superior a las probetas convencionales de ferrocemento.
{"title":"Un enfoque fuzzy para la autoevaluación en micro y pequeñas empresas de construcción","authors":"P. Dhanabal, K. S. Sushmitha, P. Narendra Reddy","doi":"10.7764/ric.00028.21","DOIUrl":"https://doi.org/10.7764/ric.00028.21","url":null,"abstract":"Este estudio evalúa las características de la durabilidad del ferrocemento mezclado con mortero de geopolímeros después de ser sometido al fuego. El ferrocemento fue preparado con mortero de geopolímeros y se comparó con el ferrocemento convencional preparado solo con mortero de cemento. Previamente, se estandarizó la concentración molar de la solución de hidróxido de sodio usada para preparar el mortero de geopolímeros mediante la resistencia residual de los cubos de mortero preparados con diversas concentraciones de NaOH. Se determinó y comparó la resistencia residual a flexión de probetas de hormigón preparadas con diferentes porcentajes en volumen (1,5%, 1,8% y 2,1%) de ferro-geopolímeros y ferrocemento, las que luego fueron sometidas durante dos horas a tres niveles de temperatura entre los 300°C y 900°C. Además, probetas con los mismos porcentajes en volumen fueron expuestas a temperaturas sobre los 900°C con el objetivo de determinar su resistencia residual al impacto. Se determinaron las características de la resistencia al fuego de las probetas en términos de Resistencia residual a flexión, resistencia residual al impacto y pérdida de peso. En todos los aspectos, las probetas preparadas con ferro-geopolímeros mostraron un comportamiento superior a las probetas convencionales de ferrocemento.","PeriodicalId":369360,"journal":{"name":"Revista Ingeniería de Construcción","volume":"59 4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126079334","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 methods of nonlinear analysis allow a better structural design and more accurate answers in the verification of a structure, through which it is based on the linear analysis of the educational institution Héctor Rene Lanegra Romero; this has a current systemic structural configuration 780, which has been designed under the parameters of the E.030 standard. To know, verify and analyze the structural performance in which the educational institution is located, nonlinear static analysis was used; which consists of a Pushover analysis. The Pushover analysis allows us to calculate the seismic actions in structures where the elastic behavior of each element is observed, it also allows us to see the operational seismic performance in which the educational institution is located, through which capacity curves are obtained, generation of plastic ball joints and the verification of the point of performance of the building; which allows identifying if the said structure is active for a seismic signal.
{"title":"Evaluation of Estructural performance using Nonlinear Static Analysis applied in an infrastructure.","authors":"N. M. Gallardo Barreto","doi":"10.7764/ric.00066.21","DOIUrl":"https://doi.org/10.7764/ric.00066.21","url":null,"abstract":"The methods of nonlinear analysis allow a better structural design and more accurate answers in the verification of a structure, through which it is based on the linear analysis of the educational institution Héctor Rene Lanegra Romero; this has a current systemic structural configuration 780, which has been designed under the parameters of the E.030 standard. To know, verify and analyze the structural performance in which the educational institution is located, nonlinear static analysis was used; which consists of a Pushover analysis. The Pushover analysis allows us to calculate the seismic actions in structures where the elastic behavior of each element is observed, it also allows us to see the operational seismic performance in which the educational institution is located, through which capacity curves are obtained, generation of plastic ball joints and the verification of the point of performance of the building; which allows identifying if the said structure is active for a seismic signal.","PeriodicalId":369360,"journal":{"name":"Revista Ingeniería de Construcción","volume":"11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116556183","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}
Victor Jiménez Arguelles, Luis Antonio Rocha Chiu, Aurora Poó Rubio
This article describes the main stages involved in the construction of the vertical shafts (large-diameter vertical wells), which are necessary for the subsequent construction of the tunnel´s sections. The different risk situations existing during the construction of the Eastern Drainage Tunnel in the valley of Mexico City (in Spanish, "Tunel Emisor Oriente") are analyzed. In order for this 52 km-long and 7.5 m-wide tunnel to carry part of the city’s sewage, 25 shafts must first be built, ranging from 55 to 150 meters deep. The magnitude of such a project implies working in different geographical areas and varied geological strata involving the presence of groundwater, which increases the risks due to possible landslides or flooding during excavation. As digging will occur in different types of soil, varying procedures must be used depending on soil type. Likewise, due to the magnitude of this kind of project, detailed scheduling and planning are required as simultaneous works on different fronts are necessary to meet deadlines. The study mentions that, while projects like these involve high risks for workers, analysis of activities and situations are conducted precisely to demonstrate that such risks can be considerably reduced.
{"title":"Risks involved in vertical shafts construction for the eastern drainage tunnel in Mexico","authors":"Victor Jiménez Arguelles, Luis Antonio Rocha Chiu, Aurora Poó Rubio","doi":"10.7764/ric.00016.21","DOIUrl":"https://doi.org/10.7764/ric.00016.21","url":null,"abstract":"This article describes the main stages involved in the construction of the vertical shafts (large-diameter vertical wells), which are necessary for the subsequent construction of the tunnel´s sections. The different risk situations existing during the construction of the Eastern Drainage Tunnel in the valley of Mexico City (in Spanish, \"Tunel Emisor Oriente\") are analyzed. In order for this 52 km-long and 7.5 m-wide tunnel to carry part of the city’s sewage, 25 shafts must first be built, ranging from 55 to 150 meters deep. The magnitude of such a project implies working in different geographical areas and varied geological strata involving the presence of groundwater, which increases the risks due to possible landslides or flooding during excavation. As digging will occur in different types of soil, varying procedures must be used depending on soil type. Likewise, due to the magnitude of this kind of project, detailed scheduling and planning are required as simultaneous works on different fronts are necessary to meet deadlines. The study mentions that, while projects like these involve high risks for workers, analysis of activities and situations are conducted precisely to demonstrate that such risks can be considerably reduced.","PeriodicalId":369360,"journal":{"name":"Revista Ingeniería de Construcción","volume":"60 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132266716","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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