The proceedings of the 13th international conference "Modern Building Materials, Structures and Techniques" (MBMST 2019)最新文献

{"title":"High-strength fluoroanhydrite composition","authors":"G. Yakovlev, J. Kerienė, V. Grakhov, R. Drochytka, A. Gordina, A. Pichugin, K. Bazhenov, V. Troshkova","doi":"10.3846/mbmst.2019.042","DOIUrl":"https://doi.org/10.3846/mbmst.2019.042","url":null,"abstract":"The research studies the properties of a high-strength anhydrite composition based on fluoroanhydrite, a\u0000waste product of hydrofluoric acid. To activate fluoranhydrite, Na3PO4 sodium phosphate was added to the composition in an amount of 3% of the mass. The physico-chemical studies of the structure and properties of activated fluoroanhydrite conducted using infrared spectroscopy and X-ray phase analysis showed changes in the composition of the\u0000hardened composite, and the study of the fluoroanhydrite microstructure revealed the formation of a denser matrix\u0000with the increased strength. An increase in the water resistance of the developed binder matrix was noted. The composition can be used as a cheap substitute for gypsum plaster due to the low prime cost of raw materials, and also contribute to the improvement of the environmental situation in fluoroanhydrite disposal sites.","PeriodicalId":169478,"journal":{"name":"The proceedings of the 13th international conference \"Modern Building Materials, Structures and Techniques\" (MBMST 2019)","volume":"33 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-12-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125199734","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":"Research of undrained shear strength of till fine soils (moraine)","authors":"Domas Gribulis, Gintaras Žaržojus, Saulius Gadeikis, Sonata Gadeikytė, Donatas Urbaitis","doi":"10.3846/mbmst.2019.040","DOIUrl":"https://doi.org/10.3846/mbmst.2019.040","url":null,"abstract":"The undrained soil strength is specific to fine soils or to sands with a lot of fines. It is very important characteristic and the evaluation of accurate value is significant step. The undrained soil shear strength can be estimated directly in laboratory and indirectly in field using in-situ methods. The values of undrained shear strength estimated with\u0000different methods usually are different, sometimes very much. In geotechnical practice a lot of empirical equations are\u0000used to calculate undrained shear strength (cu), however it corrects only in specific conditions and can’t be used universally. The empirical factor (Nk), which is used in mentioned equations, varies in wide range. It depends on many factors.\u0000The research of glacial genesis fine soils (various moraines) is complicated because it specific grain size distributions\u0000and genesis. In this article we will study relation between different laboratory and field methods to estimate of undrained\u0000shear strength (cu) of till soils. For these purposes we will used upper Pleistocene, upper Nemunas formation till fine\u0000soils.","PeriodicalId":169478,"journal":{"name":"The proceedings of the 13th international conference \"Modern Building Materials, Structures and Techniques\" (MBMST 2019)","volume":"114 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-12-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127169219","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":"Analysis of second-order effects of constructions behaviour","authors":"Raminta Venslavavičiūtė, Kestutis Urbonas","doi":"10.3846/mbmst.2019.118","DOIUrl":"https://doi.org/10.3846/mbmst.2019.118","url":null,"abstract":"This paper presents the importance of the second-order effects in behaviour of steel frame structures. EN\u00001993-1-1 were distinguished three main methods: taking / without taking into account second order effects depending\u0000on the sensitivity of horizontal design effects and tolerance. Using these methods, the susceptibility of steel frame structures to second-order impacts is considered in accordance with EN 1993-1-1. The study was performed taking into\u0000account also the rotational stiffness of the joints of the frame structure. In this way, trying to determine the effect of the\u0000joint on the rotational rigidity makes the frame structure more sensitive to second order impacts. It is also considered a\u0000semi-rigid joints effects the general frame-tailed P-Δ and the second row stress. This establishes the link between the\u0000effects of the second-order and the semi-rigid joints in the overall (general) analysis. Frame-building sensitivity makes\u0000it possible to compare and measure the importance of such dependencies.","PeriodicalId":169478,"journal":{"name":"The proceedings of the 13th international conference \"Modern Building Materials, Structures and Techniques\" (MBMST 2019)","volume":"126 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-12-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128440320","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":"Sensing properties of slag-based geopolymer composite with carbon fibers under compressive loading","authors":"P. Rovnaník, I. Kusák, L. Topolář, P. Schmid","doi":"10.3846/mbmst.2019.025","DOIUrl":"https://doi.org/10.3846/mbmst.2019.025","url":null,"abstract":"Application of functional materials has become a new trend in the construction industry. This paper aims to\u0000study the electrical and self-sensing properties of slag-based geopolymer composite. In order to improve the electrical\u0000conductivity of the basic geopolymer mortar, carbon fibers in the amount of 0.5, 1 and 2% were added. The influence\u0000of fiber addition on the electrical properties was determined by impedance spectroscopy and microstructure was analyzed by means of mercury intrusion porosimetry and SEM. The sensing properties were tested under repeated compressive loading in the elastic range and finally under loading till failure. The electrical resistance decreased with the\u0000addition of carbon fibers but it caused a deterioration of the mechanical properties. The addition of fibers does not\u0000generally improve the sensing performance of the geopolymer composite, but the mixture with 2% of fibers appeared\u0000to be unsuitable for this purpose due to the low signal-to-noise ratio.","PeriodicalId":169478,"journal":{"name":"The proceedings of the 13th international conference \"Modern Building Materials, Structures and Techniques\" (MBMST 2019)","volume":"18 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-12-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126347472","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":"Investigations on lightweight concrete prepared by combinations of rubber particles and expanded glass aggregate","authors":"S. K. Adhikary, Ž. Rudžionis","doi":"10.3846/mbmst.2019.007","DOIUrl":"https://doi.org/10.3846/mbmst.2019.007","url":null,"abstract":"Lightweight concrete is a very useful building material used in the construction sector for providing better\u0000insulation and lower energy consumption. Properties of lightweight aggregate, water-cement ratio, and other additives\u0000strongly affect the concrete strength, thermal properties, and workability. This paper investigates the behavior of lightweight\u0000concrete using rubber particles as fine aggregate, replaced by the expanded glass lightweight aggregate in the\u0000concrete mixture. In the concrete mixture expanded glass aggregate is replaced by rubber particles by 5%, 10%, 20%,\u000030%, 40%, and 50% by mass. Concrete workability, density, compressive strength, flexural strength, water absorption\u0000tests were examined. Workability and density were increasing by increasing rubber particles replacement percentages\u0000in the concrete mixture. On the other hand, compressive strength and flexural strength were decreasing by higher percentages\u0000of rubber particles replacement. Strength properties of rubberized concrete can be balanced by the proper\u0000utilization of binding materials in the concrete. Rubberized concrete can be used in the construction sector efficiently as\u0000partial replacement of lightweight aggregate in the concrete mixture.","PeriodicalId":169478,"journal":{"name":"The proceedings of the 13th international conference \"Modern Building Materials, Structures and Techniques\" (MBMST 2019)","volume":"52 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-12-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127214830","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":"Mechanical performance of biodegradable hemp shivs and corn starch-based biocomposite boards","authors":"A. Kremensas, A. Kairytė, S. Vaitkus, Sigitas Vėjelis, G. Balčiūnas, A. Strąkowska, Sylwia Członka","doi":"10.3846/mbmst.2019.132","DOIUrl":"https://doi.org/10.3846/mbmst.2019.132","url":null,"abstract":"For the production of traditional building materials, excavated natural resources are used. The production\u0000process of such materials requires high-energy demands, wherefore, high amounts of CO2 gases, which have a great\u0000impact on climate change, are emitted. Only a small part of such materials is effectively recycled and reused. Generally,\u0000they are transported to landfills, which rapidly expand and may pollute the soil, groundwater and air. Currently, a great\u0000attention is paid to the production of novel building materials. The aim is to use as less excavated materials as possible\u0000and replace them by natural renewable resources. Therefore, the recycling and utilisation at the end of life cycle of such\u0000materials would be easier and generation of waste would reduce. This way, the efforts of switching to circular economy\u0000are being put. One of the approaches – wider application of vegetable-based raw materials (cultivated and uncultivated\u0000agricultural plants). The usage of fibre hemp shives (HS) as an aggregate and corn stach (CS) as a binding material\u0000allows development of biocomposite boards (WPCs) which could contribute to the solution of the before mentioned\u0000problems.\u0000Bio-sourced materials combined with a polymer matrix offer an interesting alternative to traditional building materials.\u0000To contribute to their wider acceptance and application, an investigation into the use of wood-polymer composite boards\u0000is presented. In this study, biocomposite boards for the building industry are reported. WPCa are fabricated using a dry\u0000incorporation method of corn starch and HS treatment with water at 100 °C. The amount of CS and the size of the HS\u0000fraction are evaluated by means of compressive, bending and tensile strength, as well as microstructure. The results\u0000show that the rational amount of CS, independently on HS fraction, is 10 wt.%. The obtained WPCs have compressive\u0000stress at 10% of deformation in the range of (2.4–3.0) MPa, bending of (4.4–6.3) MPa and tensile strength of (0.23–\u00000.45) MPa. Additionally, the microstructural analysis shows that 10 wt.% of CS forms a sufficient amount of contact\u0000zones that strengthen the final product. The obtained average density (~319–408 kg/m3) indicate that, according to European normative document EN 316, WPCs can be classified as softboards and used as self-bearing structural material\u0000for building industry. Based on the requirements, WPCs can be applied in dry and humid conditions for the internal and\u0000external uses without loading (EN 622-4, section 4.2) or as load-bearing boards in dry and humid conditions for instantaneous or short-term load duration (EN 622-4, section 4.3).","PeriodicalId":169478,"journal":{"name":"The proceedings of the 13th international conference \"Modern Building Materials, Structures and Techniques\" (MBMST 2019)","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-12-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116831224","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":"Direct Metal Laser Sintering of stainless steel alloy: microstructure and mechanical properties","authors":"G. Mordas, Ada Steponavičiūtė, A. Selskienė, J. Tretjakovas, S. Borodinas","doi":"10.3846/mbmst.2019.201","DOIUrl":"https://doi.org/10.3846/mbmst.2019.201","url":null,"abstract":"Additive manufacturing (AM) is a type of manufacturing technologies whereby the material is added a layer\u0000upon layer to produce a 3D object. Produced 3D parts are applied in such industry sectors as space, aviation, automotive,\u0000building and has excellent future promises. Ourdays, the commercialy promised technique for metal manufacturing is\u0000Direct Metal Laser Sintering (DMLS). Our study concentrated on the investigation of the mechanical properties of\u0000produced17-4H (stainless steel) parts using DMLS. The effect of the DMLS process parameters (laser power, scanning\u0000speed and energy density) on the ultimate strength, yield strength and Young’s modulus was determined. We showed\u0000an evolution of the microstructure. The detected defects were classified. This study allowed to determine the optimal\u0000regimes of DMLS for SS 17-4H and describe mechanical properties of the produced parts as well as helped to show\u0000future possibilities of DMLS development.","PeriodicalId":169478,"journal":{"name":"The proceedings of the 13th international conference \"Modern Building Materials, Structures and Techniques\" (MBMST 2019)","volume":"73 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-12-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121772301","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":"How to help the choice of waterproof insulation to be sustainable?","authors":"G. Ginda","doi":"10.3846/mbmst.2019.059","DOIUrl":"https://doi.org/10.3846/mbmst.2019.059","url":null,"abstract":"Buildings serve different purposes which are denoted as functions. Function of buildings is ensured by the\u0000application of adequate structural and formal means. Contemporary buildings are of complex nature, therefore, and\u0000consist of diverse components which play specific roles. Besides, some of them are crucial for a specific structural,\u0000functional or formal purpose while other play rather secondary role. Insulation is one of the most important building\u0000components. This is because it is accountable for proper protection of structural building components against negative\u0000influences of external and internal climate conditions. It also provides necessary means for occupational safety and\u0000comfortable building exploitation. Waterproof insulation belongs to one of the most accountable building components.\u0000It is mainly applied for the protection of a building interior against water inflow from the surrounding atmospheric and\u0000underground environment. It nevertheless can be also applied for different reasons e.g. for protecting partitions in wet\u0000compartments against getting wet. Diversity of waterproof insulation application purposes results in a considerable\u0000number of technical and technological insulation solutions. Such diversity makes the choice of the proper waterproof\u0000insulation a hard task. Moreover, the implementation of circular economy idea makes insulation choice even a more\u0000difficult problem. This is why the application of specialised approaches for supporting decision with this regard is\u0000welcome. A proposal for such approach is presented in the paper. The approach may benefit from the application of\u0000different decision support tools. A specific implementation of the approach is finally discussed. The implementation\u0000makes effective use of some renowned decision support tools. The comprehesive and universal nature of the proposed\u0000approach makes it also suitable for other specific purposes e.g. reliable bid selection.","PeriodicalId":169478,"journal":{"name":"The proceedings of the 13th international conference \"Modern Building Materials, Structures and Techniques\" (MBMST 2019)","volume":"24 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-12-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125718686","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 effect of ashes on the properties of cement mortar and typical concrete fillers","authors":"J. Sētiņa, I. Juhņeviča, Janis Baronins","doi":"10.3846/mbmst.2019.031","DOIUrl":"https://doi.org/10.3846/mbmst.2019.031","url":null,"abstract":"The production of heat and electricity from shale and biomass is leading to a significant increase in the amount of the combustion residues i.e. ashes. The utilization of ashes as the pozzolanic additive in the production of Portland cement mortar and concrete for the construction of lightweight structures is the most popular way. The interaction of ashes with other typical concrete fillers also can affect the final relative short-term and long-term properties of fresh and hardened concrete when designing the concrete mixture. The influence of wood and shale ashes on the properties of cement mortar and typical concrete fillers (sand, limestone, dolomite) – fresh mortar, hydration process, and hardened mortar were researched and assessed for their applicability in the production of concrete. The best results of mechanical strength, frost resistance and water absorption were measured in case of shale ashes containing samples in combination with cement and selected concrete additive – sand. Shale ashes can be recommended for application as the active additive. Since wood ash was exhibiting lower activity, it can also be applied as a filler to produce building materials.","PeriodicalId":169478,"journal":{"name":"The proceedings of the 13th international conference \"Modern Building Materials, Structures and Techniques\" (MBMST 2019)","volume":"142 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-12-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124533906","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":"Harmonic components extraction influence on resulting modal parameters of vibrating structures","authors":"D. Mironovs, A. Mironov, A. Chate","doi":"10.3846/mbmst.2019.012","DOIUrl":"https://doi.org/10.3846/mbmst.2019.012","url":null,"abstract":"It is possible to estimate condition of static structures, like bridges and buildings, by monitoring how their\u0000modal parameters (frequency, shape and damping) change in time, based on modal parameters relation to mechanical\u0000properties. Operational modal analysis (OMA) provides estimation of modal parameters. OMA basic assumption is that\u0000excitation forces are random and their amplitude and frequency nature is similar to white noise. For structures with\u0000periodic dynamic excitation, like wind turbines or helicopter blades, this assumption is violated, which makes OMA\u0000application complicated and unreliable. There is a challenge of extracting periodic components before modal parameter\u0000estimation, which otherwise contaminate signals and mask modal information. This paper considers a signal processing\u0000tool for extraction of periodic components from signals aiming to perform OMA and to estimate modal parameters. The\u0000tool is based on time synchronous averaging and utilizes tachometer signals. The influence of signal processing technique on modal parameters is studied by comparing these parameters with and without given signal processing tool. The\u0000paper also considers the effectiveness of the tool and discusses its possible uses.","PeriodicalId":169478,"journal":{"name":"The proceedings of the 13th international conference \"Modern Building Materials, Structures and Techniques\" (MBMST 2019)","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-12-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131347144","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}