J. James, Akilan Gunaselvi Selvam, K. Annamalai, Vishal Marimuthu, Vishnu Varadhan Srinivasan, Sooraj Kolamurugan
Abstract The present investigation delved into the performance of cement stabilized soil amended with sugarcane press mud (PM), an organic waste residue from the sugar industry. An expansive soil was stabilized using 3% and 8% ordinary Portland cement (OPC) and modified with 1%, 3% and 5% PM. Cylindrical samples of dimensions 38 mm diameter and 76 mm height were cast and cured for 7, 14 and 21 days for all combinations considered. After the designated curing periods, the specimens were strained axially until failure to determine the strength of the samples. Samples were also subjected to alternate cycles of wetting and drying and the resistance to loss in weight was determined. The results of the investigation revealed that PM can be considered as a strength accelerator due to enhancement in early strength of the samples at 7 days of curing but beneficial strength gain could not be sustained over extended curing periods considered. However, 1% and 3% PM modified specimens were more resistant to weight loss when compared to pure cement stabilized specimens. Based on the results of the investigation, PM can be considered as a potential auxiliary additive to cement stabilized soil for improving the durability performance of the soil.
{"title":"Strength and Durability of Cement Stabilized Expansive Soil Amended with Sugarcane Press Mud","authors":"J. James, Akilan Gunaselvi Selvam, K. Annamalai, Vishal Marimuthu, Vishnu Varadhan Srinivasan, Sooraj Kolamurugan","doi":"10.2478/ceer-2022-0008","DOIUrl":"https://doi.org/10.2478/ceer-2022-0008","url":null,"abstract":"Abstract The present investigation delved into the performance of cement stabilized soil amended with sugarcane press mud (PM), an organic waste residue from the sugar industry. An expansive soil was stabilized using 3% and 8% ordinary Portland cement (OPC) and modified with 1%, 3% and 5% PM. Cylindrical samples of dimensions 38 mm diameter and 76 mm height were cast and cured for 7, 14 and 21 days for all combinations considered. After the designated curing periods, the specimens were strained axially until failure to determine the strength of the samples. Samples were also subjected to alternate cycles of wetting and drying and the resistance to loss in weight was determined. The results of the investigation revealed that PM can be considered as a strength accelerator due to enhancement in early strength of the samples at 7 days of curing but beneficial strength gain could not be sustained over extended curing periods considered. However, 1% and 3% PM modified specimens were more resistant to weight loss when compared to pure cement stabilized specimens. Based on the results of the investigation, PM can be considered as a potential auxiliary additive to cement stabilized soil for improving the durability performance of the soil.","PeriodicalId":54121,"journal":{"name":"Civil and Environmental Engineering Reports","volume":"32 1","pages":"138 - 151"},"PeriodicalIF":0.7,"publicationDate":"2022-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45122133","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}
Abstract In recent years, the disposal of sewage sludge has been a major concern worldwide because of their potential treat in relation with the contamination of ground water and food chain. Furthermore, their poor mechanical properties don’t allow a possible direct use in civil engineering applications. For these reasons, it was important to explore more opportunity to reuse this by-product of sewage treatment. In this frame, the solidificationstabilisation technique (S-S) which is based on hydraulic binders can improve the properties of sewage sludge so that it can be used in civil engineering application, especially in road pavements. In this context, this paper investigates the possibility of using the solidified sludge in road construction. To achieve this goal, an experimental protocol was conducted using a several combined binders: combination of Cement/ Limestone filler and Cement/Lime, with different amounts in the target to fix the optimal mixtures amount. Several tests were conducted to characterise the mechanical and geotechnical properties of the solidified sludge. The results indicate that the solidified sludge using a combined mixture of cement and lime allows a possible use as base and sub-base layer.
{"title":"Characterization of Stabilised Sewage Sludge for Reuse in Road Pavement","authors":"S. Medaoud, L. Mokrani, Samy Mezhoud, S. Ziane","doi":"10.2478/ceer-2022-0012","DOIUrl":"https://doi.org/10.2478/ceer-2022-0012","url":null,"abstract":"Abstract In recent years, the disposal of sewage sludge has been a major concern worldwide because of their potential treat in relation with the contamination of ground water and food chain. Furthermore, their poor mechanical properties don’t allow a possible direct use in civil engineering applications. For these reasons, it was important to explore more opportunity to reuse this by-product of sewage treatment. In this frame, the solidificationstabilisation technique (S-S) which is based on hydraulic binders can improve the properties of sewage sludge so that it can be used in civil engineering application, especially in road pavements. In this context, this paper investigates the possibility of using the solidified sludge in road construction. To achieve this goal, an experimental protocol was conducted using a several combined binders: combination of Cement/ Limestone filler and Cement/Lime, with different amounts in the target to fix the optimal mixtures amount. Several tests were conducted to characterise the mechanical and geotechnical properties of the solidified sludge. The results indicate that the solidified sludge using a combined mixture of cement and lime allows a possible use as base and sub-base layer.","PeriodicalId":54121,"journal":{"name":"Civil and Environmental Engineering Reports","volume":"32 1","pages":"201 - 217"},"PeriodicalIF":0.7,"publicationDate":"2022-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42903812","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}
Abstract This paper investigates the effect of simultaneous adding of recycled tire rubber (RTR) and marble waste (MW) as fine aggregates on the properties of concrete. To achieve this objective, the particles size distribution of crushed sand (CS) was corrected by the use of marble waste sand (MWS), and RTR was used by volumetric substitution (1%, 2%, 3% and 4%) of aggregates in concrete. The fresh properties were investigated using the slump, density and air content tests. Hardened properties were investigated through the compressive strength, flexural strengths, pulse velocity, elastic modulus and water absorption. The obtained results showed that the increase in the substitution rate of RTR reduced the fresh and hardened properties of concrete containing marble waste sand. However, with low substitution rates the properties of concrete remain satisfactory and the utilization of RTR and MWS leads to making a green concrete while protecting the environment.
{"title":"Effect of Recycled Tire Rubber and Marble Waste on Fresh and Hardened Properties of Concrete","authors":"R. Djebien, Amel Bouabaz, Yassine Abbas","doi":"10.2478/ceer-2022-0013","DOIUrl":"https://doi.org/10.2478/ceer-2022-0013","url":null,"abstract":"Abstract This paper investigates the effect of simultaneous adding of recycled tire rubber (RTR) and marble waste (MW) as fine aggregates on the properties of concrete. To achieve this objective, the particles size distribution of crushed sand (CS) was corrected by the use of marble waste sand (MWS), and RTR was used by volumetric substitution (1%, 2%, 3% and 4%) of aggregates in concrete. The fresh properties were investigated using the slump, density and air content tests. Hardened properties were investigated through the compressive strength, flexural strengths, pulse velocity, elastic modulus and water absorption. The obtained results showed that the increase in the substitution rate of RTR reduced the fresh and hardened properties of concrete containing marble waste sand. However, with low substitution rates the properties of concrete remain satisfactory and the utilization of RTR and MWS leads to making a green concrete while protecting the environment.","PeriodicalId":54121,"journal":{"name":"Civil and Environmental Engineering Reports","volume":"32 1","pages":"218 - 239"},"PeriodicalIF":0.7,"publicationDate":"2022-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46371534","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}
Abstract The article discusses selected issues regarding the influence of ecophysiographic and cultural- historical determinants on functional-spatial development of rural areas. Ecological, economic and social processes the have been past few decades are examined in the context of the development of local self-governments and the rise of free market economy after Poland’s socio-economic transformation. The process of intensive rural urbanization occurs especially in areas within the impact zone of big cities. It is caused by, i.a., human migration into rural areas and development of areas of business activation. The abovementioned tendencies that occur in the ecological, economic and social context have a significant impact on functional-spatial development. Expansion of housing developments and, in effect, expansion and development of necessary technical infrastructure gives rise to many problems concerning preservation of cultural heritage of the Polish countryside. The selected issues are analysed on the basis of factors and determinants occurring in the area of Lubasz village in Wielkopolskie province.The pursuit of sustainable development of rural areas is fundamental in regard to ruralist solutions as well as preservation of traditional rural architecture. Ecophysiographic and cultural-historical determinants play a considerable role in this pursuit, especially in the context of threats that stem from overurbanization of rural areas.
{"title":"The Determinants of the Existing Conditions on the Functional and Spatial Development of Rural Areas","authors":"H. Borucinska-Bienkowska","doi":"10.2478/ceer-2022-0015","DOIUrl":"https://doi.org/10.2478/ceer-2022-0015","url":null,"abstract":"Abstract The article discusses selected issues regarding the influence of ecophysiographic and cultural- historical determinants on functional-spatial development of rural areas. Ecological, economic and social processes the have been past few decades are examined in the context of the development of local self-governments and the rise of free market economy after Poland’s socio-economic transformation. The process of intensive rural urbanization occurs especially in areas within the impact zone of big cities. It is caused by, i.a., human migration into rural areas and development of areas of business activation. The abovementioned tendencies that occur in the ecological, economic and social context have a significant impact on functional-spatial development. Expansion of housing developments and, in effect, expansion and development of necessary technical infrastructure gives rise to many problems concerning preservation of cultural heritage of the Polish countryside. The selected issues are analysed on the basis of factors and determinants occurring in the area of Lubasz village in Wielkopolskie province.The pursuit of sustainable development of rural areas is fundamental in regard to ruralist solutions as well as preservation of traditional rural architecture. Ecophysiographic and cultural-historical determinants play a considerable role in this pursuit, especially in the context of threats that stem from overurbanization of rural areas.","PeriodicalId":54121,"journal":{"name":"Civil and Environmental Engineering Reports","volume":"32 1","pages":"255 - 268"},"PeriodicalIF":0.7,"publicationDate":"2022-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43738148","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}
A. Belkadi, O. Kessal, S. Bensalem, S. Aggoun, C. Amouri, M. Khouadjia
Abstract Exposure of concrete to high temperatures affects its mechanical properties by reducing the compressive strength, bending… etc. Factors reducing these properties have been focused on by several studies over the years, producing conflicting results. This article interested an important factor, that is the type of aggregates. For this, an experimental study on the behavior of concrete based on different types of aggregates: calcareous, siliceous and silico-calcareous subjected to high temperatures. In addition, the particle size distribution of the aggregates was chosen to be almost identical so that the latter does not affect the behavior of the concrete. Aggregates and concrete samples were subjected to a heating/cooling cycle of 300, 600 and 800 °C at a speed of 1 °C/ min. The mechanical and physical properties of concrete before and after exposure to high temperatures were studied. In addition, a microstructural study using a scanning electron microscope and a mercury porosimeter was performed. Thus, a comparative study between various researches on the mechanical properties of concrete exposed to high temperatures containing different types of aggregates was carried out. The compressive strength test results showed that the concrete based on siliceous aggregates (C-S) has better mechanical performance up to 300 ° C. However, above 300°C, the compressive strength decreases faster compared to calcareous-based concrete (C-C). According to the mercury porosimeter test, at 600 ° C, C-SC and C-S concretes have the highest number of pores compared to C-C concretes. The microstructure of concrete at high temperatures was influenced mainly by the aggregate’s types and the paste-aggregate transition zone. This study reinforces the importance of standardizing test procedures related to the properties of concrete in a fire situation so that all the results obtained are reproducible and applicable in other research.
{"title":"Aggregate Type Influence on Microstructural Behavior of Concrete Exposed to Elevated Temperature","authors":"A. Belkadi, O. Kessal, S. Bensalem, S. Aggoun, C. Amouri, M. Khouadjia","doi":"10.2478/ceer-2022-0002","DOIUrl":"https://doi.org/10.2478/ceer-2022-0002","url":null,"abstract":"Abstract Exposure of concrete to high temperatures affects its mechanical properties by reducing the compressive strength, bending… etc. Factors reducing these properties have been focused on by several studies over the years, producing conflicting results. This article interested an important factor, that is the type of aggregates. For this, an experimental study on the behavior of concrete based on different types of aggregates: calcareous, siliceous and silico-calcareous subjected to high temperatures. In addition, the particle size distribution of the aggregates was chosen to be almost identical so that the latter does not affect the behavior of the concrete. Aggregates and concrete samples were subjected to a heating/cooling cycle of 300, 600 and 800 °C at a speed of 1 °C/ min. The mechanical and physical properties of concrete before and after exposure to high temperatures were studied. In addition, a microstructural study using a scanning electron microscope and a mercury porosimeter was performed. Thus, a comparative study between various researches on the mechanical properties of concrete exposed to high temperatures containing different types of aggregates was carried out. The compressive strength test results showed that the concrete based on siliceous aggregates (C-S) has better mechanical performance up to 300 ° C. However, above 300°C, the compressive strength decreases faster compared to calcareous-based concrete (C-C). According to the mercury porosimeter test, at 600 ° C, C-SC and C-S concretes have the highest number of pores compared to C-C concretes. The microstructure of concrete at high temperatures was influenced mainly by the aggregate’s types and the paste-aggregate transition zone. This study reinforces the importance of standardizing test procedures related to the properties of concrete in a fire situation so that all the results obtained are reproducible and applicable in other research.","PeriodicalId":54121,"journal":{"name":"Civil and Environmental Engineering Reports","volume":"32 1","pages":"19 - 42"},"PeriodicalIF":0.7,"publicationDate":"2022-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"69189523","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}
Abstract The work concerns issues related to the diagnostics of moisture in historic buildings. Moisture content is one of the basic physical properties of materials. Excessive and undesirable growth of moisture in masonry causes considerable damage to masonry wall assemblies. It reduces the load-bearing capacity of structural elements, causes difficulties with heating and contributes to the development of mould and fungi. The article describes diagnostic procedures, provides available drying methods for walls in buildings and the applied method of renovation based on the example of damage caused by moisture in an examined historic facility.
{"title":"Diagnostics and Renovation of Moisture Affected Historic Buildings","authors":"B. Ksit, A. Szymczak-Graczyk, Bogdan Nazarewicz","doi":"10.2478/ceer-2022-0004","DOIUrl":"https://doi.org/10.2478/ceer-2022-0004","url":null,"abstract":"Abstract The work concerns issues related to the diagnostics of moisture in historic buildings. Moisture content is one of the basic physical properties of materials. Excessive and undesirable growth of moisture in masonry causes considerable damage to masonry wall assemblies. It reduces the load-bearing capacity of structural elements, causes difficulties with heating and contributes to the development of mould and fungi. The article describes diagnostic procedures, provides available drying methods for walls in buildings and the applied method of renovation based on the example of damage caused by moisture in an examined historic facility.","PeriodicalId":54121,"journal":{"name":"Civil and Environmental Engineering Reports","volume":"32 1","pages":"59 - 73"},"PeriodicalIF":0.7,"publicationDate":"2022-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49348780","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}
Abstract The purpose of the work was to review the literature and characterize organic micropollutants from the group of perfluorinated surfactants - PFAS. It is a result of the proposal to include these compounds in the new Water Directive on the list of compounds which control in drinking water will be required and subject to inspection. The group of these organic bonds includes several thousand compounds in which fluorine is linked to the (straight or branched) chain of aliphatic hydrocarbons instead of hydrogen. The article describes the permissible concentrations of PFAS in waters, the properties of these compounds, their potential impact on organisms, concentrations identified in waters, and indicates the need to limit the emissions of these compounds to surface waters. This is an important problem from the point of view of these compounds’ impact on organisms and the fact that such waters are often a source of water supply for the national economy, including consumption by the population.
{"title":"PFAS - Perfluorinated Organic Compounds in View of the New Water Directive","authors":"M. Włodarczyk-Makuła","doi":"10.2478/ceer-2022-0011","DOIUrl":"https://doi.org/10.2478/ceer-2022-0011","url":null,"abstract":"Abstract The purpose of the work was to review the literature and characterize organic micropollutants from the group of perfluorinated surfactants - PFAS. It is a result of the proposal to include these compounds in the new Water Directive on the list of compounds which control in drinking water will be required and subject to inspection. The group of these organic bonds includes several thousand compounds in which fluorine is linked to the (straight or branched) chain of aliphatic hydrocarbons instead of hydrogen. The article describes the permissible concentrations of PFAS in waters, the properties of these compounds, their potential impact on organisms, concentrations identified in waters, and indicates the need to limit the emissions of these compounds to surface waters. This is an important problem from the point of view of these compounds’ impact on organisms and the fact that such waters are often a source of water supply for the national economy, including consumption by the population.","PeriodicalId":54121,"journal":{"name":"Civil and Environmental Engineering Reports","volume":"32 1","pages":"191 - 200"},"PeriodicalIF":0.7,"publicationDate":"2022-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49551409","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}
Abstract Surface water is subject to strong anthropogenic pressures caused by the development and the extension of the agricultural activities and also by the industrial and domestic activities. Pollution is a major environmental problem due to discharges into rivers and the excessive use of agricultural fertilizers add to that the discharges from urban and industrial sources. The aim of this study is to assess the quality and the state of the organic pollution of surface water in the Kébir wadi east, based on the Water Quality Index (WQI) and the Organic Pollution Index (OPI) during six sampling campaigns carried out between April and September of the year 2011. Seven stations were studied along the Kébir wadi east downstream from the Mexa Dam. The results are visualized by the use of GIS through making thematic maps. They revealed that half of the stations show excellent to good water quality and moderated organic pollution except the stations S3, S6 and S4, that have poor water quality and high pollution at S3 and S6 respectively, and non-potable water with very high organic pollution at S4. The anthropogenic environmental deterioration recorded in the wadi is the result of the use of nitrogen and phosphate agricultural fertilizers and especially, the discharge of untreated domestic and industrial wastewater from neighbouring agglomerations. The seasonal variation remains discrete and reflects a slight tendency to the deterioration of the waters of El Tarf region during the low waters of the summer period.
{"title":"Use of Quality and Organic Pollution Indices in the Physico-Chemical Quality Assessment of Kébir Wadi East Surface Waters (Region of El Taref, Extreme North East Algeria)","authors":"S. Bahroun, Nada Nouri, Bouthaina Smida","doi":"10.2478/ceer-2022-0003","DOIUrl":"https://doi.org/10.2478/ceer-2022-0003","url":null,"abstract":"Abstract Surface water is subject to strong anthropogenic pressures caused by the development and the extension of the agricultural activities and also by the industrial and domestic activities. Pollution is a major environmental problem due to discharges into rivers and the excessive use of agricultural fertilizers add to that the discharges from urban and industrial sources. The aim of this study is to assess the quality and the state of the organic pollution of surface water in the Kébir wadi east, based on the Water Quality Index (WQI) and the Organic Pollution Index (OPI) during six sampling campaigns carried out between April and September of the year 2011. Seven stations were studied along the Kébir wadi east downstream from the Mexa Dam. The results are visualized by the use of GIS through making thematic maps. They revealed that half of the stations show excellent to good water quality and moderated organic pollution except the stations S3, S6 and S4, that have poor water quality and high pollution at S3 and S6 respectively, and non-potable water with very high organic pollution at S4. The anthropogenic environmental deterioration recorded in the wadi is the result of the use of nitrogen and phosphate agricultural fertilizers and especially, the discharge of untreated domestic and industrial wastewater from neighbouring agglomerations. The seasonal variation remains discrete and reflects a slight tendency to the deterioration of the waters of El Tarf region during the low waters of the summer period.","PeriodicalId":54121,"journal":{"name":"Civil and Environmental Engineering Reports","volume":"32 1","pages":"43 - 58"},"PeriodicalIF":0.7,"publicationDate":"2022-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49480106","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}
Abstract This paper presents the bearing capacity determination of strip footing placed on sand underlain by clay and subjected to inclined loading. The bearing capacity equation is derived within the framework of limit equilibrium by following the projected area approach. The inclinations of load spread were selected by performing an additional finite element analysis. A parametric study was conducted to highlight the effect of various input parameters such as i) the thickness of the top sand layer, ii) embedment depth of footing, iii) the friction angle of sand and cohesion of clay, and iv) inclination of the applied load. The obtained results for a vertically loaded footing are slightly underestimated with that available in the literature. The computed bearing capacity values for a foundation with inclined loading compare favorably for lower inclination angle but slightly overestimates for higher load inclination angle, concerning that obtained using the available formula in the literature.
{"title":"Ultimate Bearing Capacity of Strip Footing on Sand Underlain By Clay Under Inclined Load","authors":"R. Dutta, V. N. Khatri, Nitesh Kaundal","doi":"10.2478/ceer-2022-0007","DOIUrl":"https://doi.org/10.2478/ceer-2022-0007","url":null,"abstract":"Abstract This paper presents the bearing capacity determination of strip footing placed on sand underlain by clay and subjected to inclined loading. The bearing capacity equation is derived within the framework of limit equilibrium by following the projected area approach. The inclinations of load spread were selected by performing an additional finite element analysis. A parametric study was conducted to highlight the effect of various input parameters such as i) the thickness of the top sand layer, ii) embedment depth of footing, iii) the friction angle of sand and cohesion of clay, and iv) inclination of the applied load. The obtained results for a vertically loaded footing are slightly underestimated with that available in the literature. The computed bearing capacity values for a foundation with inclined loading compare favorably for lower inclination angle but slightly overestimates for higher load inclination angle, concerning that obtained using the available formula in the literature.","PeriodicalId":54121,"journal":{"name":"Civil and Environmental Engineering Reports","volume":"32 1","pages":"116 - 137"},"PeriodicalIF":0.7,"publicationDate":"2022-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48523120","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}
Kamil Majewski, S. Myszograj, E. Płuciennik-Koropczuk
Abstract Most of the plastic produced, being one-use plastic packaging, is finally disposed of into the environment. Several agents such as solar radiation, mechanical forces, and microbial action may enable the degradation of these plastics. The purpose of this article is to present a method for studying the properties of a surface of a microplastic particle affected by erosion at the microscale level, which occurred with the help of destructive forces associated with the impact of the sea. The results of analysis of the morphology of the tested sample of microplastic (consisting of poly(propylene)) allowed observing how it was degraded. Examining the surface of a microplastic, one can analyze a number of factors as well as determine the possible path the material has traveled until it was collected as a sample. By determining the scale of the patterns, it is possible to estimate how long the sample and other microplastics present in marine environments have been there. The use of an Atomic Force Microscope not only allows the surface of the sample to be imaged in a non-destructive manner but also enables the degree of degradation to be calculated mathematically, provided a baseline is established from which erosion can be assumed to have originated.
{"title":"Surface Morphology of a Microplastic as an Indicator of Its Microscale Degradation","authors":"Kamil Majewski, S. Myszograj, E. Płuciennik-Koropczuk","doi":"10.2478/ceer-2021-0057","DOIUrl":"https://doi.org/10.2478/ceer-2021-0057","url":null,"abstract":"Abstract Most of the plastic produced, being one-use plastic packaging, is finally disposed of into the environment. Several agents such as solar radiation, mechanical forces, and microbial action may enable the degradation of these plastics. The purpose of this article is to present a method for studying the properties of a surface of a microplastic particle affected by erosion at the microscale level, which occurred with the help of destructive forces associated with the impact of the sea. The results of analysis of the morphology of the tested sample of microplastic (consisting of poly(propylene)) allowed observing how it was degraded. Examining the surface of a microplastic, one can analyze a number of factors as well as determine the possible path the material has traveled until it was collected as a sample. By determining the scale of the patterns, it is possible to estimate how long the sample and other microplastics present in marine environments have been there. The use of an Atomic Force Microscope not only allows the surface of the sample to be imaged in a non-destructive manner but also enables the degree of degradation to be calculated mathematically, provided a baseline is established from which erosion can be assumed to have originated.","PeriodicalId":54121,"journal":{"name":"Civil and Environmental Engineering Reports","volume":"31 1","pages":"196 - 213"},"PeriodicalIF":0.7,"publicationDate":"2021-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44245298","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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