Bentonite is a natural and finite mineral resource. Dilute suspensions of sodium montmorillonite clay in water represents bentonite slurries. Suspension and orientation of colloidal clay particles define rheological properties in bentonite slurry (BS). The BS has been used about seventy years to temporarily support the excavations. More recently, polymer support fluids (PSF) gained much popularity and are widely used compared to bentonite support fluids. The PSF are categorized into natural (pure) and synthetic polymers. Physico-chemical properties of PSF are different than BS irrespective of the quite similarity in the mode of action. Synthetic polymer fluids are molecularly engineered fluids that can be a popular alternative of conventional BS deployed as excavation support fluids in different foundation applications such as diaphragm wall panels and pile bores. The synthetically engineered fluids of polymers (water-soluble) are different from conventional BS. The PSF offer additional benefits because their use is cost effective, eco-friendly, and these polymers need smaller site footprint as well as easy preparation, mixing, handling, management and ultimately the final disposal. Nevertheless, synthetic polymers have advantage over bentonite, however, foundation engineers and scientists have also certain concerns about their use because of their performance related issues. For an efficient use of polymers, specific properties and in situ behavior of polymers as well as their sorption onto the soils must be recognized because the polymer concentration in the solution is decreased with time during their use. The present manuscript reviewed the relative performance of excavation support fluids and displayed an arranged marriage of physicochemical and rhelogical properties of natural and synthetic excavation support fluids used in the foundation industry. This information will be highly useful to scientific community for their future ventures and will lay a foundation to understand the mechanisms of stabilization in open and deep excavations.
{"title":"Bentonite and polymeric support fluids used for stabilization in excavations","authors":"M. Akhtar","doi":"10.31127/tuje.1118896","DOIUrl":"https://doi.org/10.31127/tuje.1118896","url":null,"abstract":"Bentonite is a natural and finite mineral resource. Dilute suspensions of sodium montmorillonite clay in water represents bentonite slurries. Suspension and orientation of colloidal clay particles define rheological properties in bentonite slurry (BS). The BS has been used about seventy years to temporarily support the excavations. More recently, polymer support fluids (PSF) gained much popularity and are widely used compared to bentonite support fluids. The PSF are categorized into natural (pure) and synthetic polymers. Physico-chemical properties of PSF are different than BS irrespective of the quite similarity in the mode of action. Synthetic polymer fluids are molecularly engineered fluids that can be a popular alternative of conventional BS deployed as excavation support fluids in different foundation applications such as diaphragm wall panels and pile bores. The synthetically engineered fluids of polymers (water-soluble) are different from conventional BS. The PSF offer additional benefits because their use is cost effective, eco-friendly, and these polymers need smaller site footprint as well as easy preparation, mixing, handling, management and ultimately the final disposal. Nevertheless, synthetic polymers have advantage over bentonite, however, foundation engineers and scientists have also certain concerns about their use because of their performance related issues. For an efficient use of polymers, specific properties and in situ behavior of polymers as well as their sorption onto the soils must be recognized because the polymer concentration in the solution is decreased with time during their use. The present manuscript reviewed the relative performance of excavation support fluids and displayed an arranged marriage of physicochemical and rhelogical properties of natural and synthetic excavation support fluids used in the foundation industry. This information will be highly useful to scientific community for their future ventures and will lay a foundation to understand the mechanisms of stabilization in open and deep excavations.","PeriodicalId":23377,"journal":{"name":"Turkish Journal of Engineering and Environmental Sciences","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-09-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79944605","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}
Today, the building materials form the historical buildings are being exposed to various deteriorations increasingly due to different causes. Many historical masonry constructions in the world are on the edge of extinction due to the increasing frequency and changing models of material deterioration. The materials as close as possible to the original materials in terms of their chemical compositions and physical properties are required in the reconstruction and maintenance of the buildings that have historical importance. In addition, the properties of the materials used in the historical buildings are generally not known with a sufficient accuracy. This causes misapplications in case of emergencies, and also may lead to future potential greater damages on the building. The lack of data regarding the engineering properties of these buildings causes long-term damages on the buildings due to inappropriate conservation methods and materials. Therefore, it is necessary to investigate the properties of certain materials for application in the renewal of the historical buildings. Within this context, in this study the construction materials of Mardin Castle, which is located in Mardin Province, Turkey and existing for centuries as the symbol of the city, are investigated and its properties are reached. Experimental research methods were used in the study. Primarily, the castle structure was examined on-site by field study and sampling was carried out from the areas determined. The samples were analysed via various spectroscopic and geophysical methods, and various findings were achieved. Relatively variable and high levels of salinization were determined in the findings regarding the average values in stone samples of Mardin Castle’s Fortification Walls. Results of the research document the conservation status regarding Mardin Castle and provide an experimental base and also a theoretical support for the conservation of historical buildings in Turkey; and present indicative suggestions to establish conservation schemes of the historical buildings.
{"title":"Investigating the Historical Building Materials with Spectroscopic and Geophysical Methods: Case Study – Mardin Castle","authors":"Lale Karataş, Aydın Alptekin","doi":"10.31127/tuje.1145711","DOIUrl":"https://doi.org/10.31127/tuje.1145711","url":null,"abstract":"Today, the building materials form the historical buildings are being exposed to various deteriorations increasingly due to different causes. Many historical masonry constructions in the world are on the edge of extinction due to the increasing frequency and changing models of material deterioration. The materials as close as possible to the original materials in terms of their chemical compositions and physical properties are required in the reconstruction and maintenance of the buildings that have historical importance. In addition, the properties of the materials used in the historical buildings are generally not known with a sufficient accuracy. This causes misapplications in case of emergencies, and also may lead to future potential greater damages on the building. The lack of data regarding the engineering properties of these buildings causes long-term damages on the buildings due to inappropriate conservation methods and materials. Therefore, it is necessary to investigate the properties of certain materials for application in the renewal of the historical buildings. Within this context, in this study the construction materials of Mardin Castle, which is located in Mardin Province, Turkey and existing for centuries as the symbol of the city, are investigated and its properties are reached. Experimental research methods were used in the study. Primarily, the castle structure was examined on-site by field study and sampling was carried out from the areas determined. The samples were analysed via various spectroscopic and geophysical methods, and various findings were achieved. Relatively variable and high levels of salinization were determined in the findings regarding the average values in stone samples of Mardin Castle’s Fortification Walls. Results of the research document the conservation status regarding Mardin Castle and provide an experimental base and also a theoretical support for the conservation of historical buildings in Turkey; and present indicative suggestions to establish conservation schemes of the historical buildings.","PeriodicalId":23377,"journal":{"name":"Turkish Journal of Engineering and Environmental Sciences","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-08-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81750001","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}
Groundwater exploitation requires better understanding of the resource availability and quality/vulnerability. Geophysical techniques, pumping test, hydraulic measurement, borehole logging and quality test analysis have been used in Ibulesoro, southwestern Nigeria, to understanding the hydrogeological system in terms of groundwater availability, aquifer delineation, and evaluate the groundwater physico-chemical and biological contents. The study utilized multi-criteria evaluation techniques (GWPIV) to assess the overall aquifer potential/vulnerability. The geology of the area comprises granite, migmatite, migmatite gneiss, biotitic granite, and gneiss. The main water-bearing unit was the weathered layer and fractured basement, which are usually unconfined aquifer. The hydraulic conductivity and formation factor is related by y = 0.239e0.0519x with correlation coefficient of 0.0961. The average hydraulic conductivity and transmissivity are 0.52 m/d and 5.78 m2/d respectively. The hydrogeological parameters viability increases southwardly, just as groundwater movement/flow is due south. The average thickness of the weathered layer and overburden are 8.6 m and 16.1 m respectively, with dominant resistivity in the range of 80 – 200 ohm-m. The best drilling points (migmatite/gneiss geologic units) are where the fractured basement underlies the weathered layer which most not necessarily exceed 30 - 35 m. The average depth to fresh basement rock is 16.1 m. The obtained GWPIV varied from 1.12 to 1.71, with an average of 1.30 suggesting low potential but good for drinking and irrigation uses in its present state, however highly vulnerability to contamination, as the vadose zone thickness (5.68 m avg.), AVI (0.57 avg.), and LC (0.0818 mhos avg.) all point to the low protective capability. The water types is mixed Ca-Mg-Cl. The mechanism controlling the groundwater quality falls in the mixed zone, which indicates contribution from soil/rock-water interaction, precipitation, and evaporation; while carbonic weathering is more active than the silicate weathering process.
{"title":"Geo-Appraisal of Groundwater Resource for Sustainable Exploitation and Management in Ibulesoro, Southwestern Nigeria","authors":"O. Falowo","doi":"10.31127/tuje.1107329","DOIUrl":"https://doi.org/10.31127/tuje.1107329","url":null,"abstract":"Groundwater exploitation requires better understanding of the resource availability and quality/vulnerability. Geophysical techniques, pumping test, hydraulic measurement, borehole logging and quality test analysis have been used in Ibulesoro, southwestern Nigeria, to understanding the hydrogeological system in terms of groundwater availability, aquifer delineation, and evaluate the groundwater physico-chemical and biological contents. The study utilized multi-criteria evaluation techniques (GWPIV) to assess the overall aquifer potential/vulnerability. The geology of the area comprises granite, migmatite, migmatite gneiss, biotitic granite, and gneiss. The main water-bearing unit was the weathered layer and fractured basement, which are usually unconfined aquifer. The hydraulic conductivity and formation factor is related by y = 0.239e0.0519x with correlation coefficient of 0.0961. The average hydraulic conductivity and transmissivity are 0.52 m/d and 5.78 m2/d respectively. The hydrogeological parameters viability increases southwardly, just as groundwater movement/flow is due south. The average thickness of the weathered layer and overburden are 8.6 m and 16.1 m respectively, with dominant resistivity in the range of 80 – 200 ohm-m. The best drilling points (migmatite/gneiss geologic units) are where the fractured basement underlies the weathered layer which most not necessarily exceed 30 - 35 m. The average depth to fresh basement rock is 16.1 m. The obtained GWPIV varied from 1.12 to 1.71, with an average of 1.30 suggesting low potential but good for drinking and irrigation uses in its present state, however highly vulnerability to contamination, as the vadose zone thickness (5.68 m avg.), AVI (0.57 avg.), and LC (0.0818 mhos avg.) all point to the low protective capability. The water types is mixed Ca-Mg-Cl. The mechanism controlling the groundwater quality falls in the mixed zone, which indicates contribution from soil/rock-water interaction, precipitation, and evaporation; while carbonic weathering is more active than the silicate weathering process.","PeriodicalId":23377,"journal":{"name":"Turkish Journal of Engineering and Environmental Sciences","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-08-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81421191","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}
Modeling the surface element and support system in deep excavation pits and investigating the deformation mechanism is an important issue. In this study, alternative solution methods for an anchored bored pile model are compared and discussed, and it is aimed to contribute to the studies to be carried out in the deep excavation area. A numerical analysis of retaining wall design is analyzed in the case of the Sivas cultural center building's deep excavation using GGU-Retain and Plaxis 2D software. Measured field data and simulated results are discussed. As a result, the bending moment and lateral deformation reach a maximum when the foundation pit is excavated to the bottom. It can be said that the lateral deformation value found with Plaxis 2D is within the allowable limits, closer to the field data, and provides sufficient quality. The research results will provide theoretical and practical experience for the optimal design and construction of similar deep excavation pits.
{"title":"Comparative analysis of an anchored retaining wall system in a deep foundation excavation: A case study of Sivas Cultural Center Building in Türkiye","authors":"M. C. Acar, Abdullah Kekül","doi":"10.31127/tuje.1103007","DOIUrl":"https://doi.org/10.31127/tuje.1103007","url":null,"abstract":"Modeling the surface element and support system in deep excavation pits and investigating the deformation mechanism is an important issue. In this study, alternative solution methods for an anchored bored pile model are compared and discussed, and it is aimed to contribute to the studies to be carried out in the deep excavation area. A numerical analysis of retaining wall design is analyzed in the case of the Sivas cultural center building's deep excavation using GGU-Retain and Plaxis 2D software. Measured field data and simulated results are discussed. As a result, the bending moment and lateral deformation reach a maximum when the foundation pit is excavated to the bottom. It can be said that the lateral deformation value found with Plaxis 2D is within the allowable limits, closer to the field data, and provides sufficient quality. The research results will provide theoretical and practical experience for the optimal design and construction of similar deep excavation pits.","PeriodicalId":23377,"journal":{"name":"Turkish Journal of Engineering and Environmental Sciences","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-07-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83975608","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}
Due to the complexity and lack of transparency of traditional supply chains, the introduction and development of blockchain technology is of great interest to the stakeholders involved in the logistics process to improve logistics processes in the supply chain and make them more sustainable. A detailed analysis has been made for the logistics industry in this study, which is discussed to investigate the undeniable benefits of blockchain technology. Today, when we try to determine our application methods in line with sustainable development purposes, it is seen that the logistics industry gains many advantages when it is integrated with blockchain technology. For this purpose, SWOT analysis has been applied as a result of literature review for logistics management, which is one of the sub-activities of supply chain management that applies blockchain technology, and contributes to the application potential in the logistics industry. At this point, some of the strengths that will require the use of blockchain technology in the logistics sector are decentralized structure, effective information sharing, fast response, robust risk management, interprocess integrity, etc. While its weaknesses are low performance, having a complex structure and high energy consumption can be the problem. In addition, some of the opportunities that the sector will gain are the ability to optimize time, solve problems, gain competition, increase sustainability; on the other hand, external threats, cross-integration adoption, new technology, limited data privacy etc. is happening. Accordingly, its potential contribution to the logistics industry is explained in detail in this article.
{"title":"Challenges, Threats and Advantages of Using Blockchain Technology in the Framework of Sustainability of the Logistics Sector","authors":"E. Yontar","doi":"10.31127/tuje.1094375","DOIUrl":"https://doi.org/10.31127/tuje.1094375","url":null,"abstract":"Due to the complexity and lack of transparency of traditional supply chains, the introduction and development of blockchain technology is of great interest to the stakeholders involved in the logistics process to improve logistics processes in the supply chain and make them more sustainable. A detailed analysis has been made for the logistics industry in this study, which is discussed to investigate the undeniable benefits of blockchain technology. Today, when we try to determine our application methods in line with sustainable development purposes, it is seen that the logistics industry gains many advantages when it is integrated with blockchain technology. For this purpose, SWOT analysis has been applied as a result of literature review for logistics management, which is one of the sub-activities of supply chain management that applies blockchain technology, and contributes to the application potential in the logistics industry. At this point, some of the strengths that will require the use of blockchain technology in the logistics sector are decentralized structure, effective information sharing, fast response, robust risk management, interprocess integrity, etc. While its weaknesses are low performance, having a complex structure and high energy consumption can be the problem. In addition, some of the opportunities that the sector will gain are the ability to optimize time, solve problems, gain competition, increase sustainability; on the other hand, external threats, cross-integration adoption, new technology, limited data privacy etc. is happening. Accordingly, its potential contribution to the logistics industry is explained in detail in this article.","PeriodicalId":23377,"journal":{"name":"Turkish Journal of Engineering and Environmental Sciences","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-07-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79330922","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}
In the study, in situ gamma-ray measurements were applied on Sarıhan and Sarıçiçek granodiorites and the formations surrounding these units. The concentrations of radionuclide (eU(ppm), eTh(ppm), K(%)) and dose rate values were measured in total at 532 points (265 and 267 measurements were taken in Gümüşhane and Bayburt, respectively.) in both areas with a duration of 5 minutes at each measurement point. By using the obtained concentration data, the radioelement ratios (eU/eTh, eU/K, and eTh/K) give information about the origins of the rocks belonging to the study areas, the geochemical indicators (Ume, F parameter, and eU-(eTh/3,5) rate ) showing the uranium mobility and the radioelement concentrations were calculated and mapped. While the average K, eU, and eTh concentrations for Sarıçiçek granodiorite were calculated as 2.98%, 3.15 ppm, and 12.45 ppm, Sarıhan granodiorite was 1.83%, 2.73 ppm, and 13.6 ppm, respectively. The higher radioactivity values were obtained than the surrounding formations consisting of basaltic, sedimentary, and ultramafic rock combinations on the granodiorite masses. In the classification made according to radioelement ratios, it is concluded that the rocks in the study areas are formed as a mixture of the upper mantle and crustal materials. In both study areas, there is uranium transport from the granodioritic masses to the surrounding rocks, and accordingly, the rocks in the surrounding formation are enriched in uranium. As a result, radioactivity levels, rock formation origins, and uranium transport of both granodioritic masses and rocks in the surrounding formations were determined by evaluating together with the radioelement concentration values and ratios and migration parameters, and the studied areas were characterized by associating them with geology in the light of radioactive data.
{"title":"Determination of Possible Uranium Migration and The Radioactive Characteristics of Formations in The Sarıçiçek and Sarıhan Granodiorites and Surroundings","authors":"S. Altundaş, H. Çınar","doi":"10.31127/tuje.1100375","DOIUrl":"https://doi.org/10.31127/tuje.1100375","url":null,"abstract":"In the study, in situ gamma-ray measurements were applied on Sarıhan and Sarıçiçek granodiorites and the formations surrounding these units. The concentrations of radionuclide (eU(ppm), eTh(ppm), K(%)) and dose rate values were measured in total at 532 points (265 and 267 measurements were taken in Gümüşhane and Bayburt, respectively.) in both areas with a duration of 5 minutes at each measurement point. By using the obtained concentration data, the radioelement ratios (eU/eTh, eU/K, and eTh/K) give information about the origins of the rocks belonging to the study areas, the geochemical indicators (Ume, F parameter, and eU-(eTh/3,5) rate ) showing the uranium mobility and the radioelement concentrations were calculated and mapped. While the average K, eU, and eTh concentrations for Sarıçiçek granodiorite were calculated as 2.98%, 3.15 ppm, and 12.45 ppm, Sarıhan granodiorite was 1.83%, 2.73 ppm, and 13.6 ppm, respectively. The higher radioactivity values were obtained than the surrounding formations consisting of basaltic, sedimentary, and ultramafic rock combinations on the granodiorite masses. In the classification made according to radioelement ratios, it is concluded that the rocks in the study areas are formed as a mixture of the upper mantle and crustal materials. In both study areas, there is uranium transport from the granodioritic masses to the surrounding rocks, and accordingly, the rocks in the surrounding formation are enriched in uranium. As a result, radioactivity levels, rock formation origins, and uranium transport of both granodioritic masses and rocks in the surrounding formations were determined by evaluating together with the radioelement concentration values and ratios and migration parameters, and the studied areas were characterized by associating them with geology in the light of radioactive data.","PeriodicalId":23377,"journal":{"name":"Turkish Journal of Engineering and Environmental Sciences","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-07-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79931613","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}
Practical problems like measurement, control and linearization of mechanical outputs can be solved within the context of function generation problem. In this work, an exemplary application associated with the measurement of water velocities in open channels has been shown, and the resulting apparatus has been constructed and tested under laboratory conditions. To test its performance, velocities, have been compared with those obtained by the constructed prototype. The results have been observed to be consistent with each other.
{"title":"DESIGN AND MANUFACTURING A DEVICE FOR MEASURING THE VELOCITY OF LIQUID FLOWING IN OPEN CHANNELS","authors":"H. Mutlu, Emre Kaygusuz","doi":"10.31127/tuje.1115850","DOIUrl":"https://doi.org/10.31127/tuje.1115850","url":null,"abstract":"Practical problems like measurement, control and linearization of mechanical outputs can be solved within the context of function generation problem. \u0000In this work, an exemplary application associated with the measurement of water velocities in open channels has been shown, and the resulting apparatus has been constructed and tested under laboratory conditions. To test its performance, velocities, have been compared with those obtained by the constructed prototype. The results have been observed to be consistent with each other.","PeriodicalId":23377,"journal":{"name":"Turkish Journal of Engineering and Environmental Sciences","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-07-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82732367","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}
Abdülkerim Ilgün, A. Zia, Sadrettin Sancioğlu, Hasan Furkan Soydoğan, Münife Hanım Köklü, Semih Aribaş, Berna Bayram
In this paper, the buckling behaviour of thin-walled steel columns with circular cross-section and different filling materials was investigated under uniaxial load. Six different materials (concrete produced using normal aggregate, concrete produced using waste aggregate, waste fine aggregate, waste coarse aggregate, waste iron dust and polyurethane) were used as filling. Filled columns were compared experimentally with hollow thin-walled steel columns that had the same height and diameter. All specimens had the same length (750 mm), same diameter (60.3mm) and the same wall thickness (3mm). Experimental results were compared with analytical results obtained from a calculation done using the national steel design code, Design, Calculation and Construction Principles of Steel Structures 2016. Additionally, columns specimens were modelled in Abaqus software. Conservative and consistent results were obtained from comparing experimental, analytical, and numerical results.
{"title":"Buckling performance of thin-walled filled steel columns","authors":"Abdülkerim Ilgün, A. Zia, Sadrettin Sancioğlu, Hasan Furkan Soydoğan, Münife Hanım Köklü, Semih Aribaş, Berna Bayram","doi":"10.31127/tuje.1092975","DOIUrl":"https://doi.org/10.31127/tuje.1092975","url":null,"abstract":"In this paper, the buckling behaviour of thin-walled steel columns with circular cross-section and different filling materials was investigated under uniaxial load. Six different materials (concrete produced using normal aggregate, concrete produced using waste aggregate, waste fine aggregate, waste coarse aggregate, waste iron dust and polyurethane) were used as filling. Filled columns were compared experimentally with hollow thin-walled steel columns that had the same height and diameter. All specimens had the same length (750 mm), same diameter (60.3mm) and the same wall thickness (3mm). Experimental results were compared with analytical results obtained from a calculation done using the national steel design code, Design, Calculation and Construction Principles of Steel Structures 2016. Additionally, columns specimens were modelled in Abaqus software. Conservative and consistent results were obtained from comparing experimental, analytical, and numerical results.","PeriodicalId":23377,"journal":{"name":"Turkish Journal of Engineering and Environmental Sciences","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85715479","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}
For the first time, complex compound of zinc (II) 1, 2, 4, 5-benzenetetracarboxylic acid with a porous structure was synthesized. Individuality and chemical formula of a complex compound was determined according to X-ray diffraction, elemental, IR spectroscopy and derivatographic analysis. The process of thermal decomposition of the resulting compound was also studied. It isalso found that, despite the fact that the parameters of the unit cell of the crystal are significantly different from the known complex, it retains its layered polymer and porous structure.Recently high-viscosity oil fields, where non-Newtonian crudes are met, are rapidly developed.
{"title":"Coordination compounds for rheological and physical-chemical regularity of energy consumption decrease while transporting crude oils","authors":"V. Nurullayev","doi":"10.31127/tuje.1093934","DOIUrl":"https://doi.org/10.31127/tuje.1093934","url":null,"abstract":"For the first time, complex compound of zinc (II) 1, 2, 4, 5-benzenetetracarboxylic acid with a porous structure was synthesized. Individuality and chemical formula of a complex compound was determined according to X-ray diffraction, elemental, IR spectroscopy and derivatographic analysis. The process of thermal decomposition of the resulting compound was also studied. It isalso found that, despite the fact that the parameters of the unit cell of the crystal are significantly different from the known complex, it retains its layered polymer and porous structure.Recently high-viscosity oil fields, where non-Newtonian crudes are met, are rapidly developed.","PeriodicalId":23377,"journal":{"name":"Turkish Journal of Engineering and Environmental Sciences","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-05-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74298652","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}
Timber, concrete and steel are among the traditional building materials used in the construction of buildings. Since concrete is a durable material, it is a building material used in buildings, highways, dams, sidewalks and many other areas. Wood is one of the oldest building materials, and the use of wood and wood based materials for structural purposes continues to increase. The deterioration of existing wooden structures may result from fatigue and biological attack over time. The cost of replacing the damaged wooden elements is very high, so it seems more appropriate to repair and strengthen the damaged elements. In this study, 20x20x360 mm solid wood beam are reinforced with fiber reinforced polymers and the effect of fiber reinforced polymers on the bending properties of the beam was investigated. In order to determine the bending properties, three-point bending test was applied to the wood beams. As a result of this study, it was determined that the bending properties of wood beam reinforced with fiber reinforced polymer composites were better than the reference samples.
{"title":"Strengthening of Solid Beam with Fiber Reinforced Polymers","authors":"S. Kilincarslan, Yasemin ŞİMŞEK TÜRKER","doi":"10.31127/tuje.1026075","DOIUrl":"https://doi.org/10.31127/tuje.1026075","url":null,"abstract":"Timber, concrete and steel are among the traditional building materials used in the construction of buildings. Since concrete is a durable material, it is a building material used in buildings, highways, dams, sidewalks and many other areas. Wood is one of the oldest building materials, and the use of wood and wood based materials for structural purposes continues to increase. The deterioration of existing wooden structures may result from fatigue and biological attack over time. The cost of replacing the damaged wooden elements is very high, so it seems more appropriate to repair and strengthen the damaged elements. In this study, 20x20x360 mm solid wood beam are reinforced with fiber reinforced polymers and the effect of fiber reinforced polymers on the bending properties of the beam was investigated. In order to determine the bending properties, three-point bending test was applied to the wood beams. As a result of this study, it was determined that the bending properties of wood beam reinforced with fiber reinforced polymer composites were better than the reference samples.","PeriodicalId":23377,"journal":{"name":"Turkish Journal of Engineering and Environmental Sciences","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-05-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86810421","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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