Journal of Civil Engineering and Urbanism最新文献_第2页

Seasonal Variation of Physiochemical Properties of River Water Samples in Akure, South-Western Nigeria 尼日利亚西南部阿库雷河水样理化性质的季节变化

Journal of Civil Engineering and Urbanism Pub Date : 2022-01-25 DOI: 10.54203/jceu.2022.1

O. M. Ojo

引用次数: 0

Effects of Divergence Shape on the Characteristics of Hydraulic Jump in Stilling Basins Using Numerical Simulation and Neural Networks 基于数值模拟和神经网络的散度形状对消力池水跃特性的影响

Journal of Civil Engineering and Urbanism Pub Date : 2021-11-25 DOI: 10.54203/jceu.2021.9

Roozbeh Aghamagidi, Dariush Firooznia, M. Vaezi

{"title":"Effects of Divergence Shape on the Characteristics of Hydraulic Jump in Stilling Basins Using Numerical Simulation and Neural Networks","authors":"Roozbeh Aghamagidi, Dariush Firooznia, M. Vaezi","doi":"10.54203/jceu.2021.9","DOIUrl":"https://doi.org/10.54203/jceu.2021.9","url":null,"abstract":"Measures such as sudden cross-sectional divergence is among the factors affecting the characteristics of hydraulic jump. If for any reason it is not possible or cost-effective to provide the depth required for the hydraulic jump, then gradual or sudden flow cross-sectional divergence can be a good way to reduce the depth required for the jump. In this research, using the neural network and FLOW-3D numerical model, a three-dimensional (3D) model for fluid simulation, the effect of sudden divergence stilling basin on characteristics was simulated. The results of the neural network are very close to the physical model. The study revealed that 3D simulation using Flow-3D software could simulate a hydraulic jump with an average error of 2.41%. The efficiency of stilling basins divergent was calculated to be 71%, which is higher than the classic stilling basins with an efficiency of 53.3%. Depth after jumping in divergent stilling basins modeled at 27.8 and 41.4 l/s was found to be 12 and 25% less than classic basins, respectively. Compared to the classical mode in the divergent stilling basins parabolic, gradual, and sudden, the decrease in jump length was found to be 25.9%, 27.5%, and 31.8%, respectively. The results showed that the sudden divergent stilling basin has the best performance in terms of hydraulic parameters.","PeriodicalId":151760,"journal":{"name":"Journal of Civil Engineering and Urbanism","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-11-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129034279","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}

引用次数: 0

Appraisal of Cumulative Volume of Biogas Produced from Water Hyacinth and Selected Animal Dungs Co-Digestion Mixes 水葫芦与选定动物粪便共消化混合物产沼气累积量的评价

Journal of Civil Engineering and Urbanism Pub Date : 2021-11-25 DOI: 10.54203/jceu.2021.8

O. M. Ojo, J. Babatola

引用次数: 1

Evaluation of Rheological Characteristics of Graphite Modified Bitumen 石墨改性沥青流变特性的评价

Journal of Civil Engineering and Urbanism Pub Date : 2021-09-25 DOI: 10.54203/jceu.2021.7

Odunayo Olayemi Oladunjoye, O. Oyedepo, E. O. Olukanni, Sombo Philiph Akande

{"title":"Evaluation of Rheological Characteristics of Graphite Modified Bitumen","authors":"Odunayo Olayemi Oladunjoye, O. Oyedepo, E. O. Olukanni, Sombo Philiph Akande","doi":"10.54203/jceu.2021.7","DOIUrl":"https://doi.org/10.54203/jceu.2021.7","url":null,"abstract":"The level of performance of asphalt concrete has a close relationship with the properties of bitumen used. This research evaluates the rheological parameters of graphite modified bitumen. Index properties tests were conducted on bitumen and graphite to determine their suitability. Dynamic viscosity and dynamic shear rheometer were conducted on bituminous binder modified with four different proportion of graphite ranging from 2% to 10% by bitumen weight. Dynamic viscosity test was conducted on bitumen and graphite modified bitumen at temperature of 1350C and 1650C using Brookfield Viscometer. The rheological properties are centered on phase angle (δ) and complex shear modulus (G*) which were determined on bitumen and graphite modified bitumen at temperature ranging from 520C – 700C at 10 rad/s frequency using Dynamic Shear Rheometer in accordance with ASTM D7175-15. The storage modulus (G'), loss modulus (G\") and rutting parameters were then evaluated from phase angle and complex shear modulus. The bitumen and graphite modified bitumen showed that graphite modified bitumen has the highest complex shear modulus and rutting parameter of 8984 (kPa) and 33387 (kPa) at 10% graphite content. The results of viscosity helped to determine the mixing and compaction temperatures. Dynamic shear rheometer test results determined the elastic and viscous behaviour at various temperature. The higher the complex shear modulus and rutting parameter the stiffer the binder will resist deformation and rutting.","PeriodicalId":151760,"journal":{"name":"Journal of Civil Engineering and Urbanism","volume":"312 3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-09-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121228911","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}

引用次数: 0

Strength Characteristics of Concrete with Waste Polypropylene as Modifier for Pavement Construction 废聚丙烯改性混凝土路面强度特性研究

Journal of Civil Engineering and Urbanism Pub Date : 2021-09-25 DOI: 10.54203/jceu.2021.6

O. Oyedepo, E. O. Olukanni, Temitope Rufai Arowolo

{"title":"Strength Characteristics of Concrete with Waste Polypropylene as Modifier for Pavement Construction","authors":"O. Oyedepo, E. O. Olukanni, Temitope Rufai Arowolo","doi":"10.54203/jceu.2021.6","DOIUrl":"https://doi.org/10.54203/jceu.2021.6","url":null,"abstract":"The demand for a better performing pavement and the need to convert the ever-growing polymer waste into beneficial use necessitated the need to develop and characterize a polypropylene modified concrete for use in pavement construction. This research focuses on characterizing the strength of concrete produced with waste polypropylene waste as modifiers for pavement construction. The materials used in this research are fine and coarse aggregates, cement and polypropylene waste chairs (PWC). Tests were performed on the aggregate and fresh concrete to determine their suitability and characteristics for use in concrete for pavement. Two concrete grades 1:2:4 and 1:3:6 was produced into 200 mm, 400 mm and 500 mm long paving stones on which compressive and flexural tests were performed. Results obtained showed that 400 mm 1:2:4 grade concrete has the highest compressive strength of 27.36 N/mm2 at 10% polypropylene composition. The 200 mm 1:2:4 concrete grade paving stone with 10% polyprpopylene composition has the highest flexural strength of 12.90 N/mm2. The 200 mm at 10% polypropylene composition correlation coefficient has that the highest value of 0.98 which better explains the compression-flexural strength relationship and validates the 200 mm length at 10% polypropylene composition paving stone as the most adequate length of paving stone for pavement construction. It was concluded that the 200 mm long 1:2:4 concrete grade paving stone at 10% polypropylene composition is the best length of paving stone that can give an adequate flexural strength which is the most important requirent in concrete pavement requirement.","PeriodicalId":151760,"journal":{"name":"Journal of Civil Engineering and Urbanism","volume":"12 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-09-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127761840","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}

引用次数: 0

Performance of Fly Ash as Replacement for Non-Renewable Constituent in Asphaltic Concrete for Road Development 粉煤灰替代公路沥青混凝土中不可再生成分的性能研究

Journal of Civil Engineering and Urbanism Pub Date : 2021-07-25 DOI: 10.54203/jceu.2021.4

E. Chukwuka, Oyedepo Olugbenga, Aderinlewo Olufikayo, Oladele O. Isiaka

{"title":"Performance of Fly Ash as Replacement for Non-Renewable Constituent in Asphaltic Concrete for Road Development","authors":"E. Chukwuka, Oyedepo Olugbenga, Aderinlewo Olufikayo, Oladele O. Isiaka","doi":"10.54203/jceu.2021.4","DOIUrl":"https://doi.org/10.54203/jceu.2021.4","url":null,"abstract":"The non-renewable constituent used in asphalt concrete consumed large amount of materials resulting an increase in the price of asphalt mixture and consequently the cost of road development. On the other hand, huge industrial waste being generated daily from human activities causes environmental degradations. Thus, the study evaluates the performance of fly ash (FA) in asphalt concrete development targeted for road application. The aggregate, bitumen, and fly ash were characterized before being used. The stone dust in asphalt mixture was replaced with FA in predetermined proportions of 2, 4, 6, and 8% to produce a cylindrical specimen of asphalt mixture concrete. Marshal stability test, flow test, X-ray diffraction (XRD), X-ray Fluorescence (XRF) and Scanning Electron Microscope (SEM) was conducted on the composite samples. From the results, stability values of 7.39, 7.70, 7.90 and 8.22 KN was obtained at 2, 4, 6 and 8% replacements, respectively. Hence, the optimum value of 8.22 KN obtained from 8% partial replacement with FA is adequate for heavy traffic while other partial replacement from 2- 6% with stability within the range of 7.39-7.90 KN is suitable for medium traffic in accordance with the criteria for the marshal mix design method provided by Asphalt institute (1997). Corresponding values of 3.7, 3.5, 3.3 and 3.0 mm was obtained for the flow. The flow, air void, void in mineral aggregates and void filled with bitumen results all satisfied Nigeria general specification for road and bridges (1997). Therefore, fly ash can be used as partial replacement in asphaltic concrete to enhance the performance of the mix with a reduced cost for pavement construction.","PeriodicalId":151760,"journal":{"name":"Journal of Civil Engineering and Urbanism","volume":"60 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-07-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114834512","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}

引用次数: 0

Comparison of Generalized Extreme Value, Log Normal and Weibull Distributions for Assessment of Low-Flow 低流量评价的广义极值、对数正态分布和威布尔分布的比较

Journal of Civil Engineering and Urbanism Pub Date : 2021-07-25 DOI: 10.54203/jceu.2021.5

N. Vivekanandan

{"title":"Comparison of Generalized Extreme Value, Log Normal and Weibull Distributions for Assessment of Low-Flow","authors":"N. Vivekanandan","doi":"10.54203/jceu.2021.5","DOIUrl":"https://doi.org/10.54203/jceu.2021.5","url":null,"abstract":"Assessment of low-flow is an important aspect for water quality management, reservoir storage design, determining minimum release policy and safe surface water withdrawals. For which, the annual minimum d-day average flow is generally adopted procedure for characterizing the low-flow in a stream, which can be obtained by averaging the flow using moving average method for ‘d’ consecutive days viz., 7-, 10-, 14- and 30- days. This paper presents a study on comparison of three probability distributions such as Generalized Extreme Value, 2-parameter Log Normal (LN2) and Weibull adopted in estimation of low-flow for river Cauvery at Kollegal gauging site. The parameters are determined by three methods viz., method of moments, maximum likelihood method and L-Moments (LMO), and are used for estimation of low-flow. The adequacy of fitting probability distributions adopted in low-flow frequency analysis is evaluated by quantitative assessment through Goodness-of-Fit (viz., Chi-Square and Kolmogorov-Smirnov) and diagnostic (viz., correlation coefficient and root mean squared error) tests, and qualitative assessment using the fitted curves of the estimated low-flow. The results of quantitative and qualitative assessments indicate that LN2 (LMO) is better suited amongst three distributions adopted in estimation of 7-, 10-, 14- and 30- day low-flows for river Cauvery at Kollegal site.","PeriodicalId":151760,"journal":{"name":"Journal of Civil Engineering and Urbanism","volume":"40 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-07-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123126049","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}

引用次数: 0

Forgotten Personal Territories in the Traditional Iranian House: A Critical Reading 伊朗传统房屋中被遗忘的个人领地:批判性解读

Journal of Civil Engineering and Urbanism Pub Date : 2021-05-25 DOI: 10.54203/jceu.2021.3

M. Valibeigi, Sara Danay, Yegane Mokhtari

引用次数: 0

Evaluating the Trend of Changes in Bed Sediments Gradation over the Sistan River 锡斯坦河河床沉积物级配变化趋势评价

Journal of Civil Engineering and Urbanism Pub Date : 2021-03-25 DOI: 10.54203/jceu.2021.2

Mahdi Motallebian, F. Hassanpour, Hadi Kamell

{"title":"Evaluating the Trend of Changes in Bed Sediments Gradation over the Sistan River","authors":"Mahdi Motallebian, F. Hassanpour, Hadi Kamell","doi":"10.54203/jceu.2021.2","DOIUrl":"https://doi.org/10.54203/jceu.2021.2","url":null,"abstract":"Sediment movement in rivers is one of the most important indicators to evaluate the health of an ecosystem. Bed load different specification such as shape, dimensions and other statistical parameters of this sediment reflect the hydraulic and hydrological conditions governing them, directly. To investigate the changes of particle aggregation of Sistan river bed, four sediment samples were collected from the Sistan river. After aggregation of sediments in the laboratory, sediment diameter (D50) and uniformity coefficient (Cu) was calculated, and using inverse distance weighting (IDW) method, the mentioned parameters for the Sistan river from Jarikeh up to the AfzalAbad plugs place were interpolated and parameters using ARC-GIS software was zoning along the river. Results showed that Sistan river bed material is sand and silt, 3 km to the beginning and at end of the study interval based on the English standard classification it is silty texture and the rest of bed is sandy texture. 11 kilometers beginning and the end of the river also from 20 +721 kilometer up to about 12 kilometers has also a good aggregation. The entire river except for the middle section of river from the 13 +244 km to extent of 4 km river bed has non-uniform soil.","PeriodicalId":151760,"journal":{"name":"Journal of Civil Engineering and Urbanism","volume":"39 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-03-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116506179","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}

引用次数: 0

Numerical Investigation of the Unsteady Flows in Hydropower Plants 水电厂非定常流场的数值研究

Journal of Civil Engineering and Urbanism Pub Date : 2021-01-25 DOI: 10.54203/jceu.2021.1

Roozbeh Aghamagidi, M. Emami, Dariush Firooznia

{"title":"Numerical Investigation of the Unsteady Flows in Hydropower Plants","authors":"Roozbeh Aghamagidi, M. Emami, Dariush Firooznia","doi":"10.54203/jceu.2021.1","DOIUrl":"https://doi.org/10.54203/jceu.2021.1","url":null,"abstract":"One of the most important hazards that threatens the stability of power plant buildings is the phenomenon of water hammer, which can occur in the Penstock pipe of a turbine due to the rapid opening and closing of a valve. Fluid Descriptive Equations in this situation, there are two hyperbolic partial nonlinear partial differential equations that are very difficult and complex to solve analytically and are possible only for very simple conditions. In this study, by examining the two numerical methods of characteristic lines and implicit finite difference with Verwy & Yu schema, which are widely used in the analysis of instabilities, their disadvantages and advantages are clearly clarified and a suitable comparison basis for use. They should be provided in different conditions in hydropower plant. The results of the characteristic method in terms of maximum and minimum pressure show more and less values than the implicit finite difference method. In the characteristic method, perturbations and fast wave fronts are presented with more accuracy than the implicit finite difference method. At points near the upstream, downstream and middle boundaries, the accuracy of the characteristic method in presenting pressure and flow fluctuations is higher than the implicit finite difference method. In the characteristic method, it is recommended not to use certain time steps and try as much as possible avoid interpolation by selecting the appropriate time step. The results of examining the amount of changes in coefficient of friction in both methods show that it is not correct to take its value constant (proportional to the value obtained in stable conditions) and coefficient of friction should be calculated in proportion to changes in velocity at different times and used in the governing equation.","PeriodicalId":151760,"journal":{"name":"Journal of Civil Engineering and Urbanism","volume":"31 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-01-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132517574","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}

引用次数: 0