Change search
Refine search result
123 101 - 130 of 130
CiteExportLink to result list
Permanent link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf
Rows per page
  • 5
  • 10
  • 20
  • 50
  • 100
  • 250
Sort
  • Standard (Relevance)
  • Author A-Ö
  • Author Ö-A
  • Title A-Ö
  • Title Ö-A
  • Publication type A-Ö
  • Publication type Ö-A
  • Issued (Oldest first)
  • Issued (Newest first)
  • Created (Oldest first)
  • Created (Newest first)
  • Last updated (Oldest first)
  • Last updated (Newest first)
  • Disputation date (earliest first)
  • Disputation date (latest first)
  • Standard (Relevance)
  • Author A-Ö
  • Author Ö-A
  • Title A-Ö
  • Title Ö-A
  • Publication type A-Ö
  • Publication type Ö-A
  • Issued (Oldest first)
  • Issued (Newest first)
  • Created (Oldest first)
  • Created (Newest first)
  • Last updated (Oldest first)
  • Last updated (Newest first)
  • Disputation date (earliest first)
  • Disputation date (latest first)
Select
The maximal number of hits you can export is 250. When you want to export more records please use the Create feeds function.
  • 101.
    Orosz, Katalin
    et al.
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
    Fjellström, Peter
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
    Jonasson, Jan-Erik
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
    Emborg, Mats
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
    Hedlund, Hans
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
    Evaluation of the Linear Logarithmic Creep Model2014In: Nordic Concrete Research, ISSN 0800-6377, Vol. 50, p. 417-420Article in journal (Refereed)
    Abstract [en]

    In order to make reliable predictions of thermal cracking risks in young concrete, modelling of the creep behaviour is important. The linear logarithmic creep model (LLM) has only been used to describe the creep behaviour of moisture-sealed concrete samples (basic creep). The aim of the present research is to check whether LLM could be also applied to drying creep. The results indicate that the LLM delivers good results for sealed but not for drying samples. Thus, refinement of the existing model (e.g., tri-linear instead of bi-linear in logarithmic time scale), or a new model is needed to account for the increase of creep due to on-going drying.

  • 102.
    Orosz, Katalin
    et al.
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
    Fjellström, Peter
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
    Jonasson, Jan-Erik
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
    Emborg, Mats
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
    Hedlund, Hans
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
    Evaluation of Thermal Dilation and Autogenous Shrinkage at Sealed Conditions2014In: Nordic Concrete Research, ISSN 0800-6377, Vol. 50, p. 299-302Article in journal (Refereed)
    Abstract [en]

    As known, load independent deformations are of large importance in structural analysis, e. g. when estimating elongations, restraint stresses, or pre-stressing forces. Two models to describe thermal dilation (TD) and autogenous shrinkage (AS) have been evaluated, for a broader range of w/C ratios and cements types than before. In Model I, AS is determined solely based on the maturity model and TD incorporates two TD coefficients (TDC). In Model II, AS is dependent on both the maturity model and a separate temperature adjustment factor, while TDC is constant. For the more rapid-hardening cement, Model I did not give satisfactory results, whereas the usefulness of Model II to describe both AS and TD has shown to be limited, suggesting that a new model is needed.

  • 103.
    Persson, Martin
    et al.
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
    Ohlsson, Ulf
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
    Emborg, Mats
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
    Bridge deck concrete overlays: full scale studies2014In: Nordic Concrete Research, ISSN 0800-6377, Vol. 49, p. 163-180Article in journal (Refereed)
    Abstract [en]

    Concrete overlays on bridge decks are thought to be more durable when comparing with the more common solution with asphalt. Of interest is to evaluate the concrete overlay regarding traffic and shrinkage/temperature induced stresses. In a pilot study nondestructive test systems were evaluated with focus on detecting hidden defects, (e.g. debonding), that may have induced identified surface cracks. Furthermore, calibration of material parameters for a similar composite slab was done using finite element technique and compared with experimental studies in laboratory. Good agreement was found between numerical and experimental results. This will serve as an input for future bridge FE-models.

  • 104.
    Persson, Martin
    et al.
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
    Ohlsson, Ulf
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
    Emborg, Mats
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
    Bridge deck concrete overlays: full scale studies and theoretical analysis2014In: Nordic Concrete Research, ISSN 0800-6377, Vol. 50, p. 509-512Article in journal (Refereed)
    Abstract [en]

    Concrete overlays on bridge decks are thought to be more durable when comparing with the more common solution with asphalt. Of interest is to evaluate the concrete overlay regarding traffic and shrinkage/temperature induced stresses. In a pilot study nondestructive test systems were evaluated with focus on detecting hidden defects, (e.g. debonding), that may have induced identified surface cracks. Furthermore, calibration of material parameters for a similar composite slab was done using finite element technique and compared with experimental studies in laboratory. Good agreement was found between numerical and experimental results. This will serve as an input for future bridge FE-models.

  • 105.
    Persson, Martin
    et al.
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Fire Engineering.
    Ohlsson, Ulf
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Fire Engineering.
    Silfwerbrand, Johan
    Department of Civil and Architectural Engineering Department of Structural and Architectual Engineering Division, Royal Institute of Technology.
    Emborg, Mats
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Fire Engineering.
    Interface stresses in concrete bridge deck overlays subjected to differentialshrinkage2017In: Proceedings of the 23rd Nordic Concrete Research Symposium, Oslo, Norway: Nordic Concrete Federation , 2017Conference paper (Refereed)
    Abstract [en]

    Concrete overlays on bridge decks are expected to be more durable as compared with the more common asphalt solution. Besides stresses due to traffic load and temperature variations at service, the overlays are exposed to stresses due to long term shrinkage. Of interest is to evaluate the concrete overlay due to the shrinkage induced stresses at the composite interface. Three strategies have been employed to gain knowledge on the stresses; 1) use of non-destructive test systems via field observations, 2) a numerical study on a concrete composite slab tested in laboratory, 3) recordings of realistic shrinkage and climate data on a reference bridge using vibrating strain gauges and humidity probes in the newly cast concrete overlay. The data were used as input data for a linear elastic finite element model. This article demonstrates this last phase of the work.

  • 106.
    Ronin, Vladimir
    et al.
    EMC Development AB.
    Emborg, Mats
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
    Elfgren, Lennart
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
    Self-Healing Performance and Microstructure Aspects of Concrete Using Energetically Modified Cement with a High Volume of Pozzolans2014In: Nordic Concrete Research, ISSN 0800-6377, Vol. 51, p. 131-144Article in journal (Refereed)
    Abstract [en]

    Self-healing can increase the lifetime and durability of concrete structures. The self-healing properties of concrete made with Energetically Modified Cement (EMC), which has a pozzolan content of up to 70%, have been investigated. In such concretes, pozzolanic reactions within the cement cause the gradual formation of fresh C-S-H gel, which seals cracks as they form. The self-healing of small EMC concrete samples was tested in a laboratory, and field observations of an EMC concrete highway pavement were made. The EMC concrete exhibited fewer cracks than conventional concrete, and was observed to self-heal cracks with widths of up to 0.2 mm.

  • 107.
    Rådberg, Gunnar
    et al.
    Luleå tekniska universitet.
    Emborg, Mats
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
    Risk för temperatursprickor i ung betong vid gjutning av balkar och TT-kassetter: betong innehållande cement P4001997Report (Other academic)
  • 108.
    Sandström, Thomas
    et al.
    WSP Group.
    Fridh, Katja
    Division of Building Materials, Lund University.
    Emborg, Mats
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
    Hassanzadeh, Manouchehr
    Vattenfall Research & Development.
    The influence of temperature on water absorption in concrete during freezing2012In: Nordic Concrete Research, ISSN 0800-6377, Vol. 45, no 1, p. 45-58Article in journal (Refereed)
  • 109.
    Sas, Gabriel
    et al.
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
    Blanksvärd, Thomas
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
    Enochsson, Ola
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
    Emborg, Mats
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
    Täljsten, Björn
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
    Puurula, Arto
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
    Elfgren, Lennart
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
    Flexural-shear failure of a full scale tested RC bridge strengthened with NSM CFRP: Shear capacity analysis2011In: Nordic Concrete Research, ISSN 0800-6377, Vol. 2/2011, no 44, p. 189-206Article in journal (Refereed)
  • 110.
    Sayahi, Faez
    et al.
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Fire Engineering.
    Emborg, Mats
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Fire Engineering.
    Hedlund, Hans
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Fire Engineering.
    Effect of Water-Cement Ratio on Plastic Shrinkage Cracking in Self-Compacting Concrete2017In: Proceedings of the 23rd Nordic Concrete Research Symposium, Oslo, Norway: Nordic Concrete Federation , 2017Conference paper (Refereed)
    Abstract [en]

    Plastic shrinkage cracking is a mechanical phenomenon that occurs in the first few hours after casting the concrete in its mould. It is commonly believed that rapid and excessive moisture loss of the fresh concrete, mainly due to evaporation, plays a decisive role in the early age shrinkage. However, it is not always possible to justify all the plastic shrinkage incidents based on water evaporation solely. Instead, it seems that and interconnected correlation between evaporation, capillary pressure and hydration rate may offer better explanation. In this paper effect of water-cement (w/c) ratio on plastic shrinkage cracking of self-compacting concrete (SCC) is investigates. Four recipes with different w/c ratios (0.38, 0.45, 0.55 and 0.67) are tested by using Ring test method (NT BUILD 433). During the experiments evaporation, capillary pressure and internal temperature of the specimens were recorded from 60 minutes after casting up to 18 hours, at which the length and width of the cracks were measured. The results show lower risk of cracking when w/c ratio is between 0.45 to 0.55. However, the specimens with 0.38 and 0.67 w/c ratio experienced higher cracking tendency, especially the latter, in which severe cracking was observed.

  • 111.
    Sayahi, Faez
    et al.
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Fire Engineering.
    Emborg, Mats
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Fire Engineering. Betongindustri AB, Stockholm.
    Hedlund, Hans
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Fire Engineering. Skanska Sverige AB, Gothenburg.
    Plastic Shrinkage Cracking in Concrete: Influence of Test Methods2017Conference paper (Refereed)
    Abstract [en]

    Plastic shrinkage cracking can become problematic especially in concrete elements with high surface to volume ratio such as slabs and pavements. In this paper two test methods commonly used when studying the phenomenon have been evaluated; ring test method (NORDTEST-method NT Build 433) developed in NTNU/SINTEF by Johansen and Dahl in order to study the effect of different materials and constituents on the cracking tendency at macro-level, and ASTM C 1579, mainly designed in order to map the influence of fibres. During this research, influence of coarse aggregate content on plastic shrinkage cracking of self-compacting concrete (SCC) was studied. Preliminary results show same tendencies with the two methods i.e. a lower plastic shrinkage tendency with higher amount of coarse aggregates.

  • 112.
    Sayahi, Faez
    et al.
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
    Emborg, Mats
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
    Hedlund, Hans
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
    Plastic Shrinkage Cracking in Concrete: State of the Art2014In: Nordic Concrete Research, ISSN 0800-6377, Vol. 51, p. 95-110Article in journal (Refereed)
    Abstract [en]

    As plastic shrinkage cracking can dramatically reduce the durability of a concrete member and causes considerable repair costs annually, a comprehensive understanding of the mechanism of the phenomenon is essential to prevent these damages in future. In this paper, an overview is given on the mechanism of plastic shrinkage crack formation and the status of present technologies avoiding the cracking are reported through referring to previously conducted research and observations.

  • 113.
    Sayahi, Faez
    et al.
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
    Emborg, Mats
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
    Hedlund, Hans
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
    Plastic shrinkage cracking: research in Scandinavia2014In: Nordic Concrete Research, ISSN 0800-6377, Vol. 50, p. 351-354Article in journal (Refereed)
    Abstract [en]

    As plastic shrinkage cracking still causes considerable repair costs annually, an understanding of the phenomenon is essential to prevent these damages in the future. In the paper, the status of present technology to avoid cracking is briefly reported through referring to research conducted in Scandinavia. In addition, on-going activities at LTU are described and future plan is demonstrated. Thus, experiments are performed on concrete slabs cast in rectangular moulds and cured at some variations of environmental conditions. The results will be used to find critical evaporation rate at very early age.

  • 114.
    Sayahi, Faez
    et al.
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Fire Engineering.
    Emborg, Mats
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Fire Engineering.
    Hedlund, Hans
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Fire Engineering.
    Cwirzen, Andrzej
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Fire Engineering.
    Plastic Shrinkage Cracking of Self-compacting Concrete: Influence of Capillary Pressure and Dormant Period2019In: Nordic Concrete Research, ISSN 0800-6377, Vol. 60, no 1, p. 67-88Article in journal (Refereed)
    Abstract [en]

    This research investigates the effect of capillary pressure and the length of the hydration dormant period on the plastic shrinkage cracking tendency of SCC by studying specimens produced with different w/c ratios, cement types and SP dosages.

    The results show, that the cracking tendency of SCC was the lowest in case of w/c ratio between 0.45 and 0.55, finer rapid hardening cement and lower dosage of SP. The dormant period was prolonged by increasing the w/c ratio, using coarser cement and higher SP dosage. It was concluded that the cracking tendency of concrete is a function of the capillary pressure build-up rate and the length of the dormant period.

  • 115.
    Sayahi, Faez
    et al.
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Fire Engineering.
    Emborg, Mats
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Fire Engineering.
    Hedlund, Hans
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Fire Engineering.
    Cwirzen, Andrzej
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Fire Engineering.
    Stelmarczyk, Marcin
    The Severity of Plastic Shrinkage Cracking in Concrete: A New Model2019In: Magazine of Concrete Research, ISSN 0024-9831, E-ISSN 1751-763XArticle in journal (Refereed)
    Abstract [en]

    Plastic shrinkage cracking in concrete is mainly a physical process, in which chemical reactions between cement and water do not play a decisive role. It is commonly believed that rapid and excessive moisture loss, due to evaporation is the primary cause of the phenomenon. This paper presents a new model to estimate the severity of plastic shrinkage cracking, based on the initial setting time and the amount of the evaporated water from within the concrete bulk. A number of experiments were performed under controlled ambient conditions, during which the water-cement ratio, cement type, and the dosage of superplasticizer were altered. The results, alongside those reported by other researchers, were utilized to check the validity of the proposed model. According to the outcomes, the model could predict the cracking severity of the tested concretes with a relative precision.

  • 116.
    Sayahi, Faez
    et al.
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Fire Engineering.
    Emborg, Mats
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Fire Engineering.
    Hedlund, Hans
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Fire Engineering.
    Löfgren, Ingemar
    Chalmers University of Technology.
    PLASTIC SHRINKAGE CRAKING IN SELF-COMPACTING CONCRETE: A PARAMETRIC STUDY2016In: International RILEM conference on Materials, Systems and Structures in Civil Engineering 2016 (MSSCE 2016): Service Life of Cement-Based Materials and Structures / [ed] Miguel Azenha; Ivan Gabrijel; Dirk Schlicke; Terje Kanstad; Ole Mejhede Jensen, Paris, France: Rilem publications, 2016, Vol. 2, p. 609-619Conference paper (Refereed)
    Abstract [en]

    Plastic shrinkage cracking, often the first type of cracks occurring even before initial setting, causes enormous expenses for the building industry annually. The main reason behind the phenomenon is believed to be rapid and excessive surface water evaporation of the concrete element in the plastic stage which in turn leads to the so-called plastic or capillary shrinkage. These cracks mainly occur in horizontal concrete elements with large surface to volume ratio (such as slabs, pavements, etc.). This paper reports results from experiments performed, using ring test method (NORDTEST-method NT Build 433). During the experiments, influence of water-cement (w/c) ratio, cement type, coarse aggregate content and super plasticizer dosage was investigated. Moreover, effort was made to explain the difference in cracking tendency of different concretes based on water evaporation rate and capillary pressure. It seems that various parameters have different influences on the cracking tendency, the evaporation rate, as well as the hydration rate and capillary pressure. Although, capillary pressure is local and its maximum value differs in different locations, it seems that its development rate, especially in the first few hours, is almost identical everywhere in the specimen. This may be used as a plastic shrinkage indicator.

  • 117.
    Simonsson, Peter
    et al.
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
    Emborg, Mats
    Increasing productivity through utilization of new construction techniques and lean construction philosophies in civil engineering projects2009In: Nordic Concrete Research, ISSN 0800-6377, Vol. 39, no 1, p. 53-74Article in journal (Refereed)
    Abstract [en]

    The implementation of Self Compacting Concrete (SCC) together with two types of reinforcement and form techniques makes it possible to increase the degree of industrialization at construction sites markedly. To be able to realize this, Lean Construction principles prove to be important utensils during the planning and design phase. Also, the working environment is improved vastly when using SCC and different prefabricated reinforcement solutions. At the construction of the first full scale project "The Industrialized Concrete Bridge", which was built during 2006 in Sweden, the new techniques were applied. It was concluded that the working environment was improved by three fold, production time at site could be reduced with up to 20 % and that the number of workers could be reduced by virtually 25 %.

  • 118.
    Simonsson, Peter
    et al.
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
    Emborg, Mats
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
    Increasing the use and performance of SCC in bridges2011In: Nordic Concrete Research: Proceedings of the XXI Nordic Concrete Research Symposium, Hämeenlinna, Finland 2011, Oslo: The Nordic Concrete Federation , 2011, p. 99-103Conference paper (Refereed)
  • 119.
    Simonsson, Peter
    et al.
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
    Emborg, Mats
    Industrialization in Swedish bridge engineering: a case study of lean construction2007In: Proceedings: International group for lean construction conference. IGLC 15, East Lansing: Michigan State University Press, 2007, p. 244-253Conference paper (Refereed)
    Abstract [en]

    The purpose of the project has been to evaluate and possibly improve the degree of industrialization and productivity when constructing bridges in full scale. Earlier theoretical studies have indicated that, if prefabricated reinforcement, self compacting concrete (SCC) and permanent formwork are used the degree of industrialization can be increased markedly. To be able to realize this, Lean Construction principles prove to be important utensils during the planning and design phase as well as during the construction of a full scale project.Throughout the design and planning of this first full scale bridge project, intensive contacts between designer, contractor, client and material suppliers were established. The design team concluded that the production time at site could be reduced with up to 20 % and the number of workers could be reduced by virtually 50 % during almost half theproject. This was realized by planning with Last Planner ideas, and designing the project properly using modern construction tools and materials. The design team also concluded that if the concrete class increased some of the very dense shear force reinforcement could be left out.The evaluated outcome of the demonstration project, i.e. potential productivity improvements, structural quality improvements, immediate feasible waste and cost reductions and the positive impact on the working environment, shows that the predicted benefits made were fulfilled.

  • 120. Simonsson, Peter
    et al.
    Emborg, Mats
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
    Industrialized construction: benefits using SCC in cast in-situ construction2009In: Nordic Concrete Research, ISSN 0800-6377, Vol. 39, no 1, p. 33-52Article in journal (Refereed)
    Abstract [en]

    As known the product SCC comprises many advantages compared with traditional concrete, but yet it has not changed the market of cast in place concrete as expected. This relates to some robustness problems of the concrete and to a general opinion that the product is considered to be expensive. However, manufacturers have improved their quality vastly and SCC has become more robust over the last few years. To increase the use of SCC, the actors of the building trade need to be informed and convinced how to benefit from all the advantages of SCC: i.e. the working environment the health and safety of the workers, the productivity etc. This paper deals with full-scale examples on the use and the realization of SCC obtaining several benefits during a projects whole construction time. Specially, the economics and the working environment are treated.

  • 121.
    Simonsson, Peter
    et al.
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
    Emborg, Mats
    Industrialized construction with SCC obtaining many important benefits2008Conference paper (Other academic)
  • 122.
    Simonsson, Peter
    et al.
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
    Emborg, Mats
    Industriallized construction with SCC obtaining important benefits2008In: Proceedings, Nordic Concrete Research, Bållsta, Sweden: [ ... XXth Symposium on Nordic Concrete Research & Development ... The current proceedings contain 90 summaries of oral poster presentations] / [ed] Johan Silfwerbrand, Oslo: Norsk Betongforening , 2008, p. 178-179Conference paper (Refereed)
  • 123.
    Simonsson, Peter
    et al.
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
    Emborg, Mats
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
    Robust self compacting concrete for bridge construction2011In: Nordic Concrete Research, ISSN 0800-6377, Vol. 2011, no 44Article in journal (Refereed)
  • 124.
    Simonsson, Peter
    et al.
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
    Emborg, Mats
    Kjellström, Robert
    Nordmark, Lars
    Lönsamt att industrialisera och effektivisera brobygge2008In: Husbyggaren : bygg, el, VVS, anläggning, ISSN 0018-7968, no 2, p. 22-28Article in journal (Other (popular science, discussion, etc.))
    Abstract [sv]

    Om bygget av en bro projekteras i ett tidigt skede och sedan sker med nya arbetsmetoder kan brobygget bli en fjärdedel billigare. Samtidigt minskar tunga lyft för byggarna. Det är lönsamt att använda Lean-filosofins sätt att tänka långsiktigt.

  • 125.
    Sundkvist, Sven-Erik
    et al.
    Luleå tekniska universitet.
    Emborg, Mats
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
    Lif, Richard
    Luleå tekniska universitet.
    Utmattningshållfasthet för spännkabelskarvar i betongbalkar: modifierad kabelskarv typ VSL1984Report (Other academic)
  • 126. Thun, Håkan
    et al.
    Emborg, Mats
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
    Risker för temperatursprickor i prefabricerade betongelement: fältmätning och teoretisk analys av betongbalkar1997Report (Other academic)
    Abstract [sv]

    Prefabricerade betongbalkar har studerats i fältmätningar och teoretiska beräkningar avseende temperatursprickor under härdningsförloppet vid användande av cement P400. Speciellt intressant har varit att se hur temperaturer och sprickrisker varierat under den närmaste tiden efter gjutningen då balkarna härdat i gjuthall och sedan transporterats ut i kall utomhusluft. Arbetet kopplas till tidigare utförda materialprovningar på betong med P400 cement och till beräkningar där sprickrisker för några typfall har tagits fram. Arbete avser att leda fram till riktlinjer om hur prefabricerade element skall hanteras för att uppfylla krav på spricksäkerhet enligt Vägverkets rekommendationer i Bro 94.I fältmätningarna har risken för ytsprickor studerats vid gjutning av en balktyp av dimension 1200 ´ 850 mm. Betong med cement P400 och vct = 0.37 har använts. Sex balkar har gjutits i två omgångar. Längd på lagringstid i gjuthall samt för hållande vid lagring utomhus har varierats. Uppföljande beräkningar har utförts med datorprogrammen HETT2D och TEMPSTRE-N.Både fältmätningarna och uppföljande beräkningar visar att acceptabel låg ytsprickrisk kan erhållas för denna balktyp om den inte utsätts för temperaturchock vid låg utomhus temperatur och vid hög vindhastighet. Det är en mycket tidig (15 - 25 h efter gjutning) uttransport av balk som är kritisk i detta fall.Studien visar också att det är, om än med viss möda, möjligt att simulera verkliga härdningsförhållanden med beräkningsprogrammen. Under det första dygnet efter gjutningen är nämligen erhållna temperaturnivåer mycket starkt beroende av noggrannhet hos använda materialdata, isoleringsförhållanden och väderleksbetingelser. Med standardindata till beräkningsprogrammen tendera avsvalningen att bli för snabb ledande till för höga teoretiska spänningsnivåer. Med anpassade randvillkor är det möjligt att uppnå hög träffsäkerhet i analyserna.Tillsammans med övriga rapporter om temperatursprickrisk kan resultatet tjäna som underlag för rekommendationer för sprickfri prefabricering av betongbalkar kunna utarbetas.

  • 127. Wallin, Kjell
    et al.
    Emborg, Mats
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
    Jonasson, Jan-Erik
    Värme ett alternativ till kyla1997Report (Other academic)
  • 128.
    Westman, Gustaf
    et al.
    Luleå tekniska universitet.
    Emborg, Mats
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
    A visco-elastic model for the determination of creep in young concrete1995In: Proceedings of Nordic Symposium on Modern Design of Concrete Structures / [ed] Kirsten Aakjaer, Aalborg: Department of Building Technology and Structural Enginering, Aalborg University , 1995, p. 109-119Conference paper (Refereed)
  • 129.
    Westman, Gustaf
    et al.
    Luleå tekniska universitet.
    Emborg, Mats
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
    Development of a relaxations test-frame1994In: Nordic Concrete Research, ISSN 0800-6377, Vol. 15, p. 89-96Article in journal (Refereed)
    Abstract [en]

    This paper describes how relaxation tests on young concrete are performed at the Division of Structural Engineering at Luleá University of Technology. The development of a new test machine is presented and some results from pilot tests are given. The presented test method can be used to simulate different thermal stress conditions in the casting of massive concrete structures. This means that it may reduce the need for complicated and expensive full scale tests to ensure that no cracking takes place in newly cast concrete structures. A one meter long concrete beam is poured directly into a form in a steel frame. Temperated air is blown into a box containing the specimen and is circulated around it. In this way the specimen can be given a temperature development which is representative for a specific concrete structure. One of the short ends of the specimen is fixed in the steel frame and the other end is free to move in the longitudinal direction. The position of the free end of the specimen is kept within 0.2 µm from the initial position by a servo-hydraulic cylinder. In this way, nearly 100% restraint is obtained. The force acting on the cylinder is directly proportional to the stresses occurring in the concrete specimen.

  • 130.
    Westman, Gustaf
    et al.
    Luleå tekniska universitet.
    Emborg, Mats
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
    Bernander, Stig
    Creep and relaxation of young concrete1993In: Proceedings: Nordic Concrete Research Meeting : Göteborg 1993, Oslo: Norsk Betongforening , 1993, p. 65-67Conference paper (Refereed)
123 101 - 130 of 130
CiteExportLink to result list
Permanent link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf