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  • 1
    Online Resource
    Online Resource
    EDP Sciences ; 2019
    In:  MATEC Web of Conferences Vol. 282 ( 2019), p. 02059-
    In: MATEC Web of Conferences, EDP Sciences, Vol. 282 ( 2019), p. 02059-
    Abstract: Moisture level significantly affects durability of constructions, their thermal performance and quality of indoor air. As the building envelopes are subjected to the effect of changing weather conditions from the exterior and numerous sources of water vapor from interior, the proper design may significantly increase the performance of the construction. In this paper, modified plasters with different amount of super absorbent polymers (SAP) are analyzed in the laboratory conditions in terms of their hygric and mechanical properties. The results showed that addition of SAP in the plasters may be promising for the utilization in building envelopes composition. However, the exact amount of SAP is crucial as the results revealed that if more that 1% of SAP is added to the plasters, the poor mechanical properties may exclude the plasters from real applications.
    Type of Medium: Online Resource
    ISSN: 2261-236X
    Language: English
    Publisher: EDP Sciences
    Publication Date: 2019
    detail.hit.zdb_id: 2673602-0
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  • 2
    In: MATEC Web of Conferences, EDP Sciences, Vol. 322 ( 2020), p. 01036-
    Abstract: Inefficient use of end-of-life materials in combination with depletion of primary sources can be understood as a significant factor that motivates to effective waste material recycling and reuse. Since the construction industry produces millions of tons of building materials, which are continuously reaching their service life end, there is a great potential for their reuse instead of simple landfilling. In this light, concrete is a versatile building material that might incorporate lots of recycled building materials as it is demanding on primary sources. A substitution of coarse aggregates by recycled products is, therefore, one of the ways how to mitigate these environmental burdens. This paper aims at evaluation of environmental contributions of concrete with coarse aggregates being substituted by crushed concrete pavements. Various amounts of recycled aggregates were assumed (0%, 50%, and 100%) to reveal the environmental impacts. The analysis incorporates all inputs and outputs related to the production of concrete and recycling of concrete pavements (raw materials production, processing, transport emissions, energy production, etc.). The results indicate that substitution of coarse aggregates by recycled concrete pavements may bring significant mitigation of environmental impacts and hence it deserves further investigation.
    Type of Medium: Online Resource
    ISSN: 2261-236X
    Language: English
    Publisher: EDP Sciences
    Publication Date: 2020
    detail.hit.zdb_id: 2673602-0
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  • 3
    In: Materials, MDPI AG, Vol. 14, No. 23 ( 2021-11-30), p. 7361-
    Abstract: Production of concrete is connected to extensive energy demands, greenhouse gases production or primary sources depletion. Reflecting current economical, social, or environmental trends, there is strong pressure on mitigation these requirements and impacts. The exploitation of secondary- or waste materials in production processes has therefore a great potential which is not related solely to binders but also to fillers. In this light, this paper aims at thorough investigations of concrete mixtures with crushed concrete pavements as partial or full replacement of natural coarse aggregates. The research combines experimental techniques to quantify the influence of the substitution on basic physical, mechanical, and heat/moisture transport/storage parameters. The experimental data obtained are further exploited as input data for computational prediction of coupled heat and moisture transport to assess the influence of the aggregates substitution on hygrothermal performance of the built-in concretes. In the last step, the environmental impacts are assessed. Since the changes in the hygrothermal performance were found to be insignificant (i), the compressive strength were improved by up to 25% (ii) and most of the environmental impact indicators were decreased (iii) at the same time, the findings of the research presented predeterminate such a reuse strategy to wider application and use.
    Type of Medium: Online Resource
    ISSN: 1996-1944
    Language: English
    Publisher: MDPI AG
    Publication Date: 2021
    detail.hit.zdb_id: 2487261-1
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  • 4
    In: MATEC Web of Conferences, EDP Sciences, Vol. 282 ( 2019), p. 02049-
    Abstract: The built environment is accountable for 1/3 of the European energy consumption. Thermal insulation is a key factor affecting the energy performance of buildings. Historic buildings typically were made with solid external walls of brick masonry or natural stone, rarely insulated afterwards. Often the buildings have worth-preserving façades making internal insulation the only feasible technique, however significantly modifying the hygrothermal performance of the façade. The research objective of this paper is to simulate the hygrothermal performance of solid masonry walls in an old Danish hospital that will be internally insulated following the Danish requirement (U-value) for external walls (change of use of buildings) and transformed into dwellings, involving different insulation systems. Heat loss and masonry moisture content level after adding internal insulation and the possible effects of hydrophobization on the moisture content is simulated. Simulations show an increased moisture content in the original wall when adding internal insulation implying an increased risk for moisture-related damage (mould growth, frost damage and interstitial condensation). The results also show that hydrophobic impregnation of the internally insulated facades may be vital in avoiding moisture problems and securing a moisture-safe energy renovation of buildings like the one studied.
    Type of Medium: Online Resource
    ISSN: 2261-236X
    Language: English
    Publisher: EDP Sciences
    Publication Date: 2019
    detail.hit.zdb_id: 2673602-0
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  • 5
    Online Resource
    Online Resource
    Walter de Gruyter GmbH ; 2015
    In:  Measurement Science Review Vol. 15, No. 2 ( 2015-4-1), p. 85-91
    In: Measurement Science Review, Walter de Gruyter GmbH, Vol. 15, No. 2 ( 2015-4-1), p. 85-91
    Abstract: The radiative heat transfer coefficient at high temperatures is determined using a combination of experimental measurement and computational modeling. In the experimental part, cement mortar specimen is heated in a laboratory furnace to 600°C and the temperature field inside is recorded using built-in K-type thermocouples connected to a data logger. The measured temperatures are then used as input parameters in the three dimensional computational modeling whose objective is to find the best correlation between the measured and calculated data via four free parameters, namely the thermal conductivity of the specimen, effective thermal conductivity of thermal insulation, and heat transfer coefficients at normal and high temperatures. The optimization procedure which is performed using the genetic algorithms provides the value of the high-temperature radiative heat transfer coefficient of 3.64 W/(m 2 K).
    Type of Medium: Online Resource
    ISSN: 1335-8871
    Language: English
    Publisher: Walter de Gruyter GmbH
    Publication Date: 2015
    detail.hit.zdb_id: 2252681-X
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  • 6
    In: Energy, Elsevier BV, Vol. 111 ( 2016-09), p. 947-955
    Type of Medium: Online Resource
    ISSN: 0360-5442
    Language: English
    Publisher: Elsevier BV
    Publication Date: 2016
    detail.hit.zdb_id: 2019804-8
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  • 7
    Online Resource
    Online Resource
    Elsevier BV ; 2016
    In:  Composites Part B: Engineering Vol. 93 ( 2016-05), p. 184-189
    In: Composites Part B: Engineering, Elsevier BV, Vol. 93 ( 2016-05), p. 184-189
    Type of Medium: Online Resource
    ISSN: 1359-8368
    Language: English
    Publisher: Elsevier BV
    Publication Date: 2016
    detail.hit.zdb_id: 2012385-1
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  • 8
    Online Resource
    Online Resource
    EDP Sciences ; 2019
    In:  MATEC Web of Conferences Vol. 282 ( 2019), p. 02106-
    In: MATEC Web of Conferences, EDP Sciences, Vol. 282 ( 2019), p. 02106-
    Abstract: Excessive production of carbon dioxide is viewed as one of the most threat to the current generation. While the industry and transportation sector significantly improve energy efficiency and more actions are awaited, the building sector still lacking similar progress. European member states committed a decrease in produced carbon emissions which emphasis energy retrofitting of current obsolete building stock. The complex assessment of used applied materials poses an important task and searching for an advanced approach is still a big challenge. On this account, the performed study contemplates the monetarization of all negative environmental externalities to support method towards acceptance of solution with long-term perspectives. Considering responsible attitude to environmental issues accompanied by whole service life of used materials. Obtained results revealed environmental costs of mineral wool production as a supporting tool for complex building retrofit assessment.
    Type of Medium: Online Resource
    ISSN: 2261-236X
    Language: English
    Publisher: EDP Sciences
    Publication Date: 2019
    detail.hit.zdb_id: 2673602-0
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  • 9
    In: Journal of Building Physics, SAGE Publications, Vol. 41, No. 6 ( 2018-05), p. 497-520
    Abstract: A combined experimental-computational approach is used for the analysis of hygrothermal performance of a brick wall provided with interior thermal insulation system. A 2D laboratory experiment is performed to determine temperature and moisture fields in a characteristic segment of the envelope over a sufficiently long period including cold winter months. Then, a computational model of moisture and heat transport is developed, using an integral two-phase balance equation capable of distinguishing between the particular phases of water and an enthalpy-based heat balance equation. A 2D computational representation of the experiment is used for model calibration and identification of unknown parameters, resulting in a very good agreement of experimental and calculated fields, with R 2 between 0.9687 and 0.9888. The calibrated model is subsequently used for a long-term hygrothermal assessment of the studied detail to demonstrate the functionality of the interior thermal insulation system, as well as the applicability of the developed model.
    Type of Medium: Online Resource
    ISSN: 1744-2591 , 1744-2583
    Language: English
    Publisher: SAGE Publications
    Publication Date: 2018
    detail.hit.zdb_id: 2211917-6
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  • 10
    Online Resource
    Online Resource
    MDPI AG ; 2019
    In:  Energies Vol. 12, No. 7 ( 2019-04-09), p. 1353-
    In: Energies, MDPI AG, Vol. 12, No. 7 ( 2019-04-09), p. 1353-
    Abstract: In this study, we present a method for the rapid evaluation of thermal performance of building envelopes without the need of using sophisticated and time-consuming computational modeling. The proposed approach is based on the prediction of monthly energy balances per unit area of a wall assembly using monthly averages of temperature and relative humidity, as well as the elevation of a building’s location. Contrary to most other methods, the obtained results include how moisture content in the wall effects its thermal performance. The developed formulas for calculation of monthly energy balances are verified for nine commonly used wall assemblies in Central Europe in 10 randomly selected locations. The observed agreement of the predicated data was determined using advanced finite-element simulation tools and hourly climatic data, which makes for good prerequisites for the further application of the method in both research and building practices.
    Type of Medium: Online Resource
    ISSN: 1996-1073
    Language: English
    Publisher: MDPI AG
    Publication Date: 2019
    detail.hit.zdb_id: 2437446-5
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