Selected Scientific Papers Journal of Civil Engineering最新文献_第9页

Equilibrium isotherm studies of copper and zinc removal from model solutions using natural and alkaline treated hornbeam sawdust 用天然和碱性处理的角木屑从模型溶液中去除铜和锌的平衡等温线研究

Selected Scientific Papers Journal of Civil Engineering Pub Date : 2020-12-01 DOI: 10.1515/SSPJCE-2020-0016

Z. Kováčová, S. Demcak, M. Bálintová

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Review on Alternatives of Aggregates with Alternative Materials in Eastern Africa 东非替代材料替代骨料的研究进展

Selected Scientific Papers Journal of Civil Engineering Pub Date : 2020-12-01 DOI: 10.1515/SSPJCE-2020-0014

C. Ngandu

{"title":"Review on Alternatives of Aggregates with Alternative Materials in Eastern Africa","authors":"C. Ngandu","doi":"10.1515/SSPJCE-2020-0014","DOIUrl":"https://doi.org/10.1515/SSPJCE-2020-0014","url":null,"abstract":"\u0000 Normal concrete, with bulky aggregate generally results to large amount of energy and natural resource requirement. Normal aggregates mining and river sand extraction, if done in unsustainably, potentially results in adverse environmental, health or hazardous impacts. There is therefore the need to research and utilize alternative more sustainable construction materials.\u0000 This main aim is to review properties of alternative aggregate or mixes with those aggregates within Eastern Africa. In this study, 23 reviews, at optimum aggregate replacement using volcanic materials, crushed rock sand and also fired bone generally indicated good strength performance. Majority of the alternative materials mixes presented indicated higher water absorption, lower slumps/workability and density, compared with the reference. Lower slump could affect compaction, strength or increase costs. Appropriate cost-effective admixtures or plasticizers are recommended while materials exhibiting lower strengths could be explored for non-structural use. Utilization of recycled waste for aggregate could help address resource scarcity and reduce construction environmental footprint.\u0000 There should be more research and development of proper procedures and techniques so as to ensure adequate bondage, optimal water/cement ratio and compaction and also use of cost-effective admixtures.","PeriodicalId":30755,"journal":{"name":"Selected Scientific Papers Journal of Civil Engineering","volume":"34 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81110500","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

Recycled aggregate amount variation of fraction 4/8 mm and 8/16 mm in the concrete mixture 再生骨料在混凝土混合料中4/ 8mm和8/ 16mm的掺量变化

Selected Scientific Papers Journal of Civil Engineering Pub Date : 2020-12-01 DOI: 10.1515/SSPJCE-2020-0017

J. Junák, N. Junakova

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Lifecycle and ecomonical study of selected thermal solar installations 选定热太阳能装置的生命周期和经济性研究

Selected Scientific Papers Journal of Civil Engineering Pub Date : 2020-12-01 DOI: 10.1515/SSPJCE-2020-0022

J. Košičan, M. Picazo, S. Vilčeková

{"title":"Lifecycle and ecomonical study of selected thermal solar installations","authors":"J. Košičan, M. Picazo, S. Vilčeková","doi":"10.1515/SSPJCE-2020-0022","DOIUrl":"https://doi.org/10.1515/SSPJCE-2020-0022","url":null,"abstract":"\u0000 Creating a scheme of solar thermal installations is a mighty move forward to develop a suitable energy standards of residential buildings. In recent years were done many studies, which did a several energy simulations for residence buildings. If design of thermal installation is false, it can lead to rise in the expensive overall energy costs and unsatisfactory thermal comfort in the building. Nowdays, in Slovakia using solar thermal installations are increasing more than in recent years. This research investigates twelve modern solar water heating systems, formed on the roof of the family house. We tried to make analysis, where designed solar energy systems were appropriate and fulfill energy requirements of DHW and heating. The study deals with the best financial alternative of the prepared installations of the house. According to overall prices of installation, energy production of additional source for heating and total system efficiency and lifespan, we found out the best possible choice. Expected amount of the various energy contribution is simulated in specialized program. If we talk about midterm energy values, we can see the best possible choice for the alternatives. In this case we made analysis of these schemes for typical family house in Kosice. We set the limits of the building and analyzed which scheme is the best for need of the yearly average water consumption and heating.","PeriodicalId":30755,"journal":{"name":"Selected Scientific Papers Journal of Civil Engineering","volume":"237 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79062404","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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Analyses of selected thermal-technical parameters of an innovative construction board with built-in infrared heating 一种新型内置红外加热结构板的热技术参数选择分析

Selected Scientific Papers Journal of Civil Engineering Pub Date : 2020-12-01 DOI: 10.1515/SSPJCE-2020-0013

D. Dubecký, M. Kozlovská

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Investigation of the use of various materials for the construction of an enthalpy exchanger 用各种材料建造一个焓交换器的研究

Selected Scientific Papers Journal of Civil Engineering Pub Date : 2020-12-01 DOI: 10.1515/SSPJCE-2020-0021

P. Kozak, D. Košičanová

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Numerical Modelling of Oedometer Test 里程表试验的数值模拟

Selected Scientific Papers Journal of Civil Engineering Pub Date : 2020-12-01 DOI: 10.1515/SSPJCE-2020-0025

Hana Agraine, M. Bouali

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Single case study photovoltaic panels within water heating system 光伏板在热水系统中的单一案例研究

Selected Scientific Papers Journal of Civil Engineering Pub Date : 2020-12-01 DOI: 10.1515/SSPJCE-2020-0019

R. Baláž

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Behaviour of Sediments in Water Structures 沉积物在水结构中的行为

Selected Scientific Papers Journal of Civil Engineering Pub Date : 2020-12-01 DOI: 10.1515/SSPJCE-2020-0020

N. Junakova, J. Junák

{"title":"Behaviour of Sediments in Water Structures","authors":"N. Junakova, J. Junák","doi":"10.1515/SSPJCE-2020-0020","DOIUrl":"https://doi.org/10.1515/SSPJCE-2020-0020","url":null,"abstract":"\u0000 Bottom sediments are a natural part of aquatic ecosystems. They are increasingly contributing to the deterioration of watercourses and reservoirs and are an undesirable material that causes various serious environmental and technical problems. The most significant problems include the instability of riverbeds, the transport of chemicals, nutrients and organic compounds, the supply of sediments to water reservoirs. Bottom sediments have the ability to bind to their surface various predominantly harmful substances such as heavy metals, radionuclides, nutrients and organic substances. Such sediments pose a risk to the water system in terms of possible remobilization of pollutants into the water.\u0000 This paper is focused on the study of behavior of sediments in the Hervartov small water reservoir located in the east of Slovakia and their ability to adsorb phosphorus at the sediment-water interface. The results show that the efficiency of sorption of phosphorus from the aqueous environment by fine and coarse-grained sediments is the highest at the lowest input concentrations of phosphorus in solution, or at low concentrations in surface water above the sediment. At these concentrations, the amount of sorbed phosphorus by fine-grained sediments was up to almost 99%. The coarse-grained sediments sorbed phosphorus at a level of up to 84%. Increasing the concentration of phosphorus in the solution leads to a decrease in the sorption efficiency of the sediment, while at high concentrations of the sorbate, the sorption process is significantly stabilized due to reaching the maximum sorption capacity of bottom sediments.","PeriodicalId":30755,"journal":{"name":"Selected Scientific Papers Journal of Civil Engineering","volume":"51 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85748989","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

The impact of interior construction on the indoor environmental quality 室内施工对室内环境质量的影响

Selected Scientific Papers Journal of Civil Engineering Pub Date : 2020-12-01 DOI: 10.1515/SSPJCE-2020-0023

K. Harčárová, S. Vilčeková

{"title":"The impact of interior construction on the indoor environmental quality","authors":"K. Harčárová, S. Vilčeková","doi":"10.1515/SSPJCE-2020-0023","DOIUrl":"https://doi.org/10.1515/SSPJCE-2020-0023","url":null,"abstract":"\u0000 The presented paper deals with the evaluation of the indoor environmental quality (IEQ) in two apartment units in different phases of interior construction. The first apartment is in the initial phase of an unfurnished apartment and the second in the final phase of a fully furnished apartment. The results of IEQ monitoring indicate that in terms of thermal-humidity microclimate, the required legislative limits were met and the differences between the unfurnished and the fully furnished apartment were minimal. Only the operative temperature values were not in the legislative range. The average particulate matter (PM) concentrations of the two representative fractions (PM2.5 and PM10) were 21.10 μg/m3 and 564.72 μg/m3 for the unfurnished apartment and 4.67 μg/m3 and 68.15 μg/m3 for the furnished apartment. The legislative limit of 50 μg/m3 for PM10 was therefore significantly exceeded, especially in the case of an unfurnished apartment in the initial phase. The average TVOC concentration expressed in toluene equivalents was 1955 μg/m3 in a furnished apartment and 910 μg/m3 in an unfurnished apartment. Both of these values exceeded Mølhave’s recommended limit of 200 μg/m3. The presence of xylenes (51.19 μg/m3) and ethylbenzene (17.27 μg/m3) was detected in an unfurnished apartment. In addition to xylenes (171.63 μg/m3) and ethylbenzene (79.25 μg/m3), toluene (78.34 μg/m3) was also present in the furnished apartment. The concentrations of these compounds were below the legislative limits, except for ethylbenzene for which no legislative limits are set. The above results show that further surface treatment and furnishing of the apartment contribute to the increase of the VOC levels in the indoor environment. In the case of unfurnished apartment, workers are exposed not only to elevated concentrations of TVOC but also to elevated concentrations of PM10 and should therefore pay attention to the protection and safety of health during the work.","PeriodicalId":30755,"journal":{"name":"Selected Scientific Papers Journal of Civil Engineering","volume":"132 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79645469","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