Constructii Journal of Civil Engineering Research最新文献

{"title":"Assess the Effects of Leakage Current on Reinforced Concrete in a Connected Building System","authors":"R. Abdollahi","doi":"10.19080/cerj.2020.10.555789","DOIUrl":"https://doi.org/10.19080/cerj.2020.10.555789","url":null,"abstract":"Armed concrete has been used as an effective and safe German for over 50 years in industrial, commercial systems, as well as systems protection systems. Concrete acts as a suitable substrate such as many moist soils, such as an active media environment. The ability of the concrete to accelerate moisture absorption and stability, in the long run, makes the task of implementing the earth electrode, especially for dry places. Over the years, the use of the buried electrodes in the concrete has reached full maturity. The primary concerns for dealing with large currents and preventing local rapid warming and blowing up concrete supports of embedded metal conductors have been considered. However, new concerns appeared and should be addressed by industry experts. A new concern is the long - term impact of small currents on rebar corrosion and the creation of micro-cracks around concrete connections. In this paper, the long - term impact of small currents on armed concrete has been tested and tested. Experimental results show that long - term passage of building leakage currents in the connected building system causes compressive strength reduction, reduction of concrete durability and increased penetration of reinforced concrete. The flow passage through the reinforced concrete leads to an increase in the temperature of the concrete and thus the evaporation of the water present in it, and the water vapor pressure causes the penetration of the voids of concrete to the boundary of the sand and sand. In addition, the evaporation of the concrete also leads to an increase in the electrical resistance of the reinforced concrete.","PeriodicalId":30320,"journal":{"name":"Constructii Journal of Civil Engineering Research","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2020-08-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86097188","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}

{"title":"Features of Pressure-Free Impregnation of Binders and their Bid in the Practice of Fixing the Moving Desert Sands","authors":"Mirakhmedov Makhamadjan","doi":"10.19080/cerj.2020.10.555787","DOIUrl":"https://doi.org/10.19080/cerj.2020.10.555787","url":null,"abstract":"Desert sand is subject to deflation. During the construction and operation of railways in the sandy desert, deflation leads to filling the railway track with sand, as well as to soil erosion. To prevent this phenomenon, a binder is sprayed onto the surface of the sand. The penetration of the working composition of the binder into the sand is accompanied by an uneven distribution of the substance, which is proposed to characterize the saturation coefficient. The features of the interaction of the binder and sand from which the protective crust is formed are revealed. Impregnation occurs under the predominant influence of gravitational or capillary forces. The latter allows you to have a uniform distribution of the substance. Preliminary wetting can reduce the pore space of sand and change the nature of the transfer of matter to capillary, which as a result allows obtaining resource-saving technology for fixing movable sand.","PeriodicalId":30320,"journal":{"name":"Constructii Journal of Civil Engineering Research","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2020-08-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80748857","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}

{"title":"Philosophical Rationalisation of a Geotechnical Narrative to Cost Overruns in Highway Projects","authors":"Alolote Amadi I","doi":"10.19080/cerj.2020.10.555786","DOIUrl":"https://doi.org/10.19080/cerj.2020.10.555786","url":null,"abstract":"Different methodological routes to the study of cost overruns are evident in the literature. A critical review reveals several gaps, particularly the lack of methodologically robust explanatory evidence to support the assertions that geotechnical risks significantly impact on cost overruns in highway projects. This study evaluates and select an adequate philosophical/methodological orientation relevant to provide a geotechnical narrative to the phenomena of cost overruns in highway projects. This paper thus sets out the underlying philosophical and logical reasoning that served as a guide on the conduct of a study, carried out to illuminate geotechnical trajectories to cost overruns in highway projects. Critical evaluation of the different philosophical stances evident in the literature was carried out, while factoring in the practicality and compatibility of the methods implicit in the various research strategies. The study adopted the philosophical stance of the critical realist, via the amalgamation of ontological positivism, with epistemological constructivism, in acknowledging the role that values and societal ideology play in the derivation of empirical knowledge on cost overruns. The case study approach was further justified as an appropriate research strategy necessary to provide a geotechnical narrative to cost overruns, in view of its: wholesomeness in investigating the study phenomena; ability to incorporate requisite multiple data sources and research techniques; and compatibility with adopted pragmatist philosophical critical realist viewpoint. The study espouses the need for objectivity, albeit a multi-perspective interpretative understanding of the human factors in organizational practice, that drive the more technical concerns about ground related risks, as a core requirement, necessary to provide a geotechnical narrative to cost overruns in highway projects.","PeriodicalId":30320,"journal":{"name":"Constructii Journal of Civil Engineering Research","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2020-07-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89881411","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}

{"title":"Geo-Characterisation of Highway Construction Cost Drivers in the Niger Delta Region of Nigeria","authors":"Alolote Amadi I","doi":"10.19080/cerj.2020.10.555785","DOIUrl":"https://doi.org/10.19080/cerj.2020.10.555785","url":null,"abstract":"This study explores the geologic peculiarities of the Niger Delta region, which creates a propensity for the significantly high cost of highway development. The heterogeneous geologic configuration of the area, in terms of its landscape, geomorphology and hydrology are descriptively and techno-economically analysed, based on available local literature, supplemented by geotechnical field work data. The study discusses and analyses the construction cost implications of the inherent geo-variability of the terrain, and the financial implications as it relates to the practicalities of carrying out road construction in the Niger Delta. The analysis outlines the cost considerations associated with highway pavement and drainage construction in view of the hydro-geomorphological setting of the Niger Delta. The analysis reiterates the predominance of fined grained subgrade soils, which will require remedial re-engineering measures and significant construction costs. Furthermore, the study highlights the increased costs of drainage construction in view of the significant volume of precipitation surplus and relief of the region. The study submits that recognising the challenges and cost associated with the adverse geo-configuration of most parts of the Niger Delta, is a necessary starting point to maximise value for money in highway projects.","PeriodicalId":30320,"journal":{"name":"Constructii Journal of Civil Engineering Research","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2020-07-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80504124","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}

{"title":"Settlements Preparation for Future Progress in Vehicles","authors":"Hasenko Lv","doi":"10.19080/cerj.2020.10.555781","DOIUrl":"https://doi.org/10.19080/cerj.2020.10.555781","url":null,"abstract":"The research is devoted to individual environment-friendly vehicles, which can be used in the street-road network of settlements. Are analyzed the benefits that accrue from the use of such vehicles in the areas of medicine, the environment, the economy, and the social sphere. The examples of individual vehicles, the most common of which is a bicycle, are presented. Are formulated particularities of such modes of transport and the requirements that must be applied to the infrastructure for comfortable and safe driving by them.","PeriodicalId":30320,"journal":{"name":"Constructii Journal of Civil Engineering Research","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2020-07-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73219994","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}

{"title":"Influence of Vegetation on Shear Stress and Flow Rate in Open Channel using Flow3D","authors":"A. Fard","doi":"10.19080/cerj.2020.09.555774","DOIUrl":"https://doi.org/10.19080/cerj.2020.09.555774","url":null,"abstract":"Flood accidents account for approximately one-third of all financial losses worldwide. Analysis of the trend of accidents shows that in recent years such incidents have increased dramatically. In recent years, river engineers have been looking for a suitable solution to reduce the impact of floods. The critical role of floodplains in flood relief is significant and their reconstruction is being promoted [1]. The hydraulic flow exchange between the river channel and its floodplain is complex. In a relatively high discharge that engulfs the adjacent floodplain, the exchange of flow between the main channel and the floodplain results in rotational currents [2]. Traditionally, the presence of vegetation on the floodplain as a problem that disrupts flow capacity has been the focus of river engineers [3]. The presence of vegetation in the floodplains adds a degree of complexity to the analysis of composite channel flows and the amount of drag force applied by the flow to the plant cannot be ignored. Observing the riverbanks shows that plant growth in a row on the edge of a flood plain is a common arrangement [4]. A range of coastal plants may be used for shore sustainability, promoting environmental diversity or for creating scenic landscapes. Hubble [5] et al. Knowledge about the impact of vegetation on the flow structure is scarce at present. In order to achieve simultaneous protection against floods and environmental requirements, better awareness of the hydraulic flow in composite channels with vegetation is required. High-momentum rotational currents transmit the current from the main channel to the floodplain, which results in a decrease in transmission in the main channel and its increase near the floodplain. This phenomenon is known as the kinematic effect [6]. The relative depth of Dr is defined as the ratio of the flow depth in the floodplain (Hfp) to the water depth in the main channel (Hmc) [7]. Strong exchange was observed at a relative depth between 0.1 and 0.3 [8]. In composite channels like simple straight channels, rotational currents are caused by non-isotropic perturbations and their properties are influenced by many factors such as channel transverse geometry, shape ratio, relative depth and turbulence value. Tominaga and Nezu [9] performed experiments on a rectangular composite channel and concluded that the size and position of secondary flows were highly dependent on channel geometry [10]. The researchers identified a weak secondary current in the main channel and floodplain at a relative depth of Dr = 0.5, and a rotational current near the free surface of the current along the side wall of the main channel [11].","PeriodicalId":30320,"journal":{"name":"Constructii Journal of Civil Engineering Research","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2020-02-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82623242","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}

{"title":"Elastic Critical Stress for Trapezoidal Sheeting with Flange and Web Stiffeners","authors":"Torsten Höglund","doi":"10.19080/cerj.2020.09.555772","DOIUrl":"https://doi.org/10.19080/cerj.2020.09.555772","url":null,"abstract":"      (11) 2 3 p p r 1 r 22 2 sa p 1 1 p 1 3 3 2 1 1 1 1 3 2 6 n b b s b s A EI b b s b D b α             = + − + −          ⋅ +","PeriodicalId":30320,"journal":{"name":"Constructii Journal of Civil Engineering Research","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2020-02-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77747004","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}

{"title":"Intelligent Systems for Detection and Control Damage on Buried Infrastructure due to Soil Subsidence","authors":"S. García","doi":"10.19080/CERJ.2019.09.555771","DOIUrl":"https://doi.org/10.19080/CERJ.2019.09.555771","url":null,"abstract":"Subsidence and its impact on infrastructure and urban systems is a serious problem for many of the most densely populated cities in the world and a huge challenge for those who develop safe, sustainable and resilient communities. In Mexico City, from the government’s call to generate solutions to this problem, a huge multidisciplinary project is being developed to attack the most pressing fronts: control of the effects, management of the pumping of the aquifers, simulation of catastrophic scenarios for the reintegration of the inhabitants in sites with better capacities to hold communities. This presentation summarizes the contributions about digital twins of the soil/rock masses (key properties and their evolution) and the controlling system to prevent and to repair leaks in pipeline networks. Evaluate these aspects permits study future pumping scenarios to assist in selecting an optimal rate of extraction that minimizes overall subsidence, meet the requirements of city development plan and be consistent with continued sustainable economic development. No doubt about the many other aspects that need to be analyzed but this first stage is crucial to start a reconfiguration of the city life, reconciled with nature, aware of the ravages of excessive and unbalanced consumption of the vital liquid.","PeriodicalId":30320,"journal":{"name":"Constructii Journal of Civil Engineering Research","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2020-01-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85054129","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}

{"title":"Lithostabilisation of Karal: Case of Maroua at the Far North Region of Cameroon","authors":"M. M.","doi":"10.19080/cerj.2019.09.555766","DOIUrl":"https://doi.org/10.19080/cerj.2019.09.555766","url":null,"abstract":"","PeriodicalId":30320,"journal":{"name":"Constructii Journal of Civil Engineering Research","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2019-12-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91234356","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}

{"title":"The Vicious Cycle of The Effects of School Building Construction Abandonment: Beneficiary’s Perspective","authors":"Isaac Sakyi Damoah","doi":"10.19080/cerj.2019.09.555763","DOIUrl":"https://doi.org/10.19080/cerj.2019.09.555763","url":null,"abstract":"Purpose: Public sector school building construction plays an important role in national education. However, in developing countries, some of these projects are not completed but researchers have not paid attention to the vicious cycle effects on the beneficiaries of such projects. To this end, this study explores the effects of public sector school building abandonment by using Ghanaian Community Day Senior High School building as a case study.","PeriodicalId":30320,"journal":{"name":"Constructii Journal of Civil Engineering Research","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2019-11-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82363853","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}