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INVESTIGATION OF PHYSICAL AND MECHANICAL PROPERTIES OF CONCRETE WITH CRYSTALLIZATION ADDITIVE 掺加结晶剂混凝土的物理力学性能研究
Mokslas Lietuvos Ateitis Pub Date : 2022-02-14 DOI: 10.3846/mla.2022.15188
E. Pocius, Audrius Čepulis
{"title":"INVESTIGATION OF PHYSICAL AND MECHANICAL PROPERTIES OF CONCRETE WITH CRYSTALLIZATION ADDITIVE","authors":"E. Pocius, Audrius Čepulis","doi":"10.3846/mla.2022.15188","DOIUrl":"https://doi.org/10.3846/mla.2022.15188","url":null,"abstract":"The article analyses what effect crystallization additive usage has on concrete physical and mechanical properties and shrinkage to find most effective concrete additive. Investigations of concrete properties with various amounts of crystallization admixture were performed. 9 concrete mixtures with different amounts of crystallizing admixtures were formed and admixtures were added to the concrete mixes from 0.6% to 1.4% of the cement mass, in increments of 0.1%. During the research, the influence of the amount of crystallization admixture the density of hardened concrete, flexural strength, compressive strength, and shrinkage was determined. After evaluating the physical, mechanical properties and shrinkage of the concrete, it was determined that the optimal amount of crystallizing admixture in the concrete mixture is 1% of the cement mass. Thus, it can be argued that the use of a crystallizing admixture has a positive effect i.e., reduces the shrinkage of concrete, because of which cracks in concrete structures can be avoided.","PeriodicalId":30324,"journal":{"name":"Mokslas Lietuvos Ateitis","volume":"45 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-02-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90747822","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
DIMENSIONS OF BIM IN LITERATURE: REVIEW AND ANALYSIS 文献中bim的维度:回顾与分析
Mokslas Lietuvos Ateitis Pub Date : 2022-02-09 DOI: 10.3846/mla.2022.16071
Gintarė Piaseckienė
{"title":"DIMENSIONS OF BIM IN LITERATURE: REVIEW AND ANALYSIS","authors":"Gintarė Piaseckienė","doi":"10.3846/mla.2022.16071","DOIUrl":"https://doi.org/10.3846/mla.2022.16071","url":null,"abstract":"BIM (Building information modeling) is a process supported by various tools and is widely analyzed all across the world. Still BIM dimensions are not yet clearly classified and analyzed. At this moment, it is agreed to clasifie the main 5 dimensions of BIM. From the 6th onwards there is a wide debate on what each should be. This analysis covers BIM dimensions clarification in science literature adding strengths and weaknesses analysis that has been made for every dimension separately.","PeriodicalId":30324,"journal":{"name":"Mokslas Lietuvos Ateitis","volume":"34 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-02-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73664479","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: 1
RESEARCH OF EVALUATION SIGNIFICANCE CRITERIA FOR BIM STRUCTURAL MODEL VARIANTS bim结构模型变异的显著性评价标准研究
Mokslas Lietuvos Ateitis Pub Date : 2022-02-01 DOI: 10.3846/mla.2022.15805
Tomas Sinkevič
{"title":"RESEARCH OF EVALUATION SIGNIFICANCE CRITERIA FOR BIM STRUCTURAL MODEL VARIANTS","authors":"Tomas Sinkevič","doi":"10.3846/mla.2022.15805","DOIUrl":"https://doi.org/10.3846/mla.2022.15805","url":null,"abstract":"The article analyzes of evaluation criteria for the construction variants of the Building Information Model (BIM). The article analyzes the evaluation criteria of the construction variants of the Building Information Modeling (BIM). Based on the different construction variants of the multistorey building information model, the most important criteria have been identified for the evaluation of BIM technologies in the construction project. A survey questionnaire was created and after interviewing 22 respondents the evaluations of BIM experts were collected. The obtained research data were analyzed with the help of the analytical pairwise comparison method in the hierarchy process. The significance of the criteria and the benefits of the application of BIM technologies were determined with the help of using iterations by the expert pairwise comparison method.","PeriodicalId":30324,"journal":{"name":"Mokslas Lietuvos Ateitis","volume":"53 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88421290","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 RESULTS OF RESEARCH PNEUMATIC ELECTROMAGNETIC PULSATOR COMBINED WITH COLLECTOR 气动电磁脉冲器与集热器组合的研究结果
Mokslas Lietuvos Ateitis Pub Date : 2022-02-01 DOI: 10.3846/mla.2022.15162
P.P. Yatsunskyi
{"title":"THE RESULTS OF RESEARCH PNEUMATIC ELECTROMAGNETIC PULSATOR COMBINED WITH COLLECTOR","authors":"P.P. Yatsunskyi","doi":"10.3846/mla.2022.15162","DOIUrl":"https://doi.org/10.3846/mla.2022.15162","url":null,"abstract":"This article demonstrates the results of experimental research one of the pulsators. Its main difference from others is a pneumatic electromagnetic pulsator in combination with a collector. Therefore, this article describes in detail the process of studying the pulsator. The planned experiment was carried out on by Factorial experiments with multiple factors. The influence of factors (the ripple frequency n, the milk ejection q and the ratio between strokes t/T) on the vacuum pressure in the inter wall chamber of teat cups was studied. The regression equation of the dependence response criterion on factors is modeled. This dependence is demonstrated graphically. Also there is a contour graph which is for more detailed information.","PeriodicalId":30324,"journal":{"name":"Mokslas Lietuvos Ateitis","volume":"33 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74301980","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
SELECTION OF STANDARD CONSTRUCTION CONTRACTS MODEL AND CONTRACT PURCHASE PRICING 标准施工合同模式的选择与合同采购定价
Mokslas Lietuvos Ateitis Pub Date : 2022-01-25 DOI: 10.3846/mla.2022.16054
Arvydas Vilkonis
{"title":"SELECTION OF STANDARD CONSTRUCTION CONTRACTS MODEL AND CONTRACT PURCHASE PRICING","authors":"Arvydas Vilkonis","doi":"10.3846/mla.2022.16054","DOIUrl":"https://doi.org/10.3846/mla.2022.16054","url":null,"abstract":"The aim of the research is to determine for a contract’s “Design and construction works of Vilnius city wastewater treatment plant” the most suitable variant of the combination of the FIDIC standard construction contract model and the purchase pricing of contract works using the SAW. Based on expert assessments, a matrix of possible solutions is formed by interviewing 8 experts (4 public procurement specialists and 4 civil engineers). Calculations have shown that the most appropriate combination of the FIDIC standard construction contract model and contract purchase pricing is the FIDIC Yellow Book and fixed price pricing. The obtained research results mainly reflect the essence of the FIDIC Yellow Book, assessing the specifics of the contract and the complexity of the planned works.","PeriodicalId":30324,"journal":{"name":"Mokslas Lietuvos Ateitis","volume":"55 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-01-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84847130","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
INFLUENCE OF LOCAL DISPLACEMENTS AND STRESSES ON COMBINED STRING STRUCTURE 局部位移和应力对组合弦结构的影响
Mokslas Lietuvos Ateitis Pub Date : 2022-01-20 DOI: 10.3846/mla.2022.15246
E. Beivydas
{"title":"INFLUENCE OF LOCAL DISPLACEMENTS AND STRESSES ON COMBINED STRING STRUCTURE","authors":"E. Beivydas","doi":"10.3846/mla.2022.15246","DOIUrl":"https://doi.org/10.3846/mla.2022.15246","url":null,"abstract":"The article discusses the combined string construction of a single span. 2 load methods are analyzed when the structure is loaded with a distributed load and when the structure is loaded with concentrated loads on the struts. The stresses and displacements caused by such loading methods are given. The effect of prestressing caused by the distributed load and local deflections in the string is discussed in more detail. It is assumed that the additional stresses caused by local displacements under constant load can be treated as prestressing. To confirm the assumption, 2 loading methods are compared: when the structure is loaded with concentrated loads and the string is subjected to additional prestressing; when the structure is subjected to a distributed load without additional prestressing.","PeriodicalId":30324,"journal":{"name":"Mokslas Lietuvos Ateitis","volume":"65 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-01-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88960059","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
CONNECTIONS BETWEEN STEEL-CONCRETE COMPOSITE COLUMN AND STEEL BEAM 钢-混凝土组合柱与钢梁的连接
Mokslas Lietuvos Ateitis Pub Date : 2022-01-17 DOI: 10.3846/mla.2022.15213
Andrej Mudrov
{"title":"CONNECTIONS BETWEEN STEEL-CONCRETE COMPOSITE COLUMN AND STEEL BEAM","authors":"Andrej Mudrov","doi":"10.3846/mla.2022.15213","DOIUrl":"https://doi.org/10.3846/mla.2022.15213","url":null,"abstract":"Composite steel-concrete columns of circular cross-section have high strength and stiffness, which theoretically could help to reduce the cost of construction, but their advantages are still widely unexploited. In comparison with other constructions, composite columns account for a diminutive market share. One of the many reasons for this, is the complexity of connections that may require on-site welding, which not only slows down the construction, but also makes it more expensive. With the recent extensive development of blind bolts, new design options for the tube columns emerged. Such bolted joints would eliminate onsite welding and speed up installation. In this review a particular attention is paid to the circular columns, because these columns have the least studied connections. This article reviews the most recent stage in the development of the connections between steel-concrete composite columns and steel beams, as well as provides provisions for using such connections and outlines the directions for further research.","PeriodicalId":30324,"journal":{"name":"Mokslas Lietuvos Ateitis","volume":"65 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-01-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84028015","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
MULTIPLE CRITERIA DECISION MAKING ANALYSIS OF THE PORT OF ŠVENTOJI DEVELOPMENT 多准则决策分析港口Šventoji的发展
Mokslas Lietuvos Ateitis Pub Date : 2022-01-13 DOI: 10.3846/mla.2022.15486
Rokas Eitutis
{"title":"MULTIPLE CRITERIA DECISION MAKING ANALYSIS OF THE PORT OF ŠVENTOJI DEVELOPMENT","authors":"Rokas Eitutis","doi":"10.3846/mla.2022.15486","DOIUrl":"https://doi.org/10.3846/mla.2022.15486","url":null,"abstract":"Port of Šventoji is a maritime facility in the settlement of Šventoji, located within the country Lithuania, near the seaside resort town of Palanga. In this paper five Port of Šventoji development alternatives are overviewed using a multi-criteria decisionmaking (MCDM) method. The results will be compared with the ones found in “Port of Šventoji reconstruction feasibility study” (liet. Šventosios jūrų uosto atstatymo galimybių studija). Criteria weights of the analysed alternatives are determined using the entropy method. Alternative analysis is carried out using the TOPSIS multicriteria method.","PeriodicalId":30324,"journal":{"name":"Mokslas Lietuvos Ateitis","volume":"827 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-01-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77546545","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
FEM ANALYSIS OF ENERGY LOSS DUE TO WAVE PROPAGATION FOR MICRO-PARTICLE IMPACTING SUBSTRATE WITH HIGH VELOCITIES 微粒高速冲击基材时波传播能量损失的有限元分析
Mokslas Lietuvos Ateitis Pub Date : 2022-01-11 DOI: 10.3846/mla.2022.15178
Giedrius Jočbalis
{"title":"FEM ANALYSIS OF ENERGY LOSS DUE TO WAVE PROPAGATION FOR MICRO-PARTICLE IMPACTING SUBSTRATE WITH HIGH VELOCITIES","authors":"Giedrius Jočbalis","doi":"10.3846/mla.2022.15178","DOIUrl":"https://doi.org/10.3846/mla.2022.15178","url":null,"abstract":"The impact between particles and material surface is a micro-scaled physical phenomenon found in various technological processes and in the study of the mechanical properties of materials. Design of materials with desired properties is a challenging issue for most industries. And especially in aviation one of the most important factors is mass. Recently with the innovations in 3D printing technologies, the importance of this phenomenon has increased. Numerical simulation of multi-particle systems is based on considering binary interactions; therefore, a simplified but as much accurate as possible particle interaction model is required for simulations. Particular cases of axisymmetric particle to substrate contact is modelled at select impact velocities and using different layer thicknesses. When modelling the particle impact at high contact velocity, a substrate thickness dependent change in the restitution coefficient was observed. This change happens is due to elastic waves and is important both to coating and 3D printing technologies when building layers of different properties materials.","PeriodicalId":30324,"journal":{"name":"Mokslas Lietuvos Ateitis","volume":"25 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-01-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83723726","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
CRACKING ANALYSIS OF PRECAST – IN SITU REINFORCED CONCRETE SLAB WITH PLASTIC VOID FORMERS 现浇钢筋混凝土塑性孔型板开裂分析
Mokslas Lietuvos Ateitis Pub Date : 2022-01-11 DOI: 10.3846/mla.2022.15151
Juozas Masėnas
{"title":"CRACKING ANALYSIS OF PRECAST – IN SITU REINFORCED CONCRETE SLAB WITH PLASTIC VOID FORMERS","authors":"Juozas Masėnas","doi":"10.3846/mla.2022.15151","DOIUrl":"https://doi.org/10.3846/mla.2022.15151","url":null,"abstract":"In this article results of experimental and numerical analysis of precast – in situ reinforced concrete slab with plastic void formers are discussed. Slab is composed of precast and in situ concrete layers. Voids are formed inside the slab using spherical plastic void formers. Slab cracking pattern is determined by numerical analysis. Cracking pattern acquired by numerical analysis is compared to cracking pattern determined by experimental study. Shear stiffness in the bond between precast and in situ concrete layers was specified when numerical model was built.","PeriodicalId":30324,"journal":{"name":"Mokslas Lietuvos Ateitis","volume":"39 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-01-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88435390","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
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