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  • 1.
    Jelagin, Denis
    et al.
    KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Building Materials.
    AHMED, ABUBEKER
    Lu, Xiaohu
    Said, Safwat F.
    Asphalt layer rutting performance prediction tools2018Report (Other academic)
    Abstract [en]

    Flexible pavement rutting due to permanent deformation accumulation in asphalt layers is one of the most common modes of road failures. In addition to creating high maintenance costs, rutting is a major concern for traffic safety, as the rut development increases the risk of hydroplaning and introduce difficulties in vehicle steering. In this context, accurate methodologies for pavement rutting performance prediction are crucial for decision support in pavement design and rehabilitation. In particular, better rutting performance models are needed to evaluate, new asphalt materials as well as to evaluate the impact of different vehicle types on roads’ service life.The main goal of this report is to present a summary of the existing asphalt rutting performance prediction tools. The present review is limited to available and/or frequently referred to tests and models with an established link to field rutting performance. Accordingly, models focusing solely on permanent deformation on the material level are beyond the framework of the present study.Road structure and its materials, heavy vehicle parameters and climate affecting rutting accumulation in the field are identified. Their significance has been evaluated based on the experimental and numerical findings reported in the literature. Several rutting performance prediction models recently proposed in the literature are summarized along with the material characterization tests used in the models. The reviewed models’ capability to quantify the influence of various structural, material and traffic parameters on the pavement’s rutting performance is examined. It is concluded that implementation of rutting performance models incorporating experimentally measured viscoelastic and permanent deformation properties of asphalt mixtures is a promising way to improve the accuracy of pavement performance predictions. In particular since they allow the effect of novel materials, e.g. polymer-modified, on the pavement’s rutting performance to be quantified.

  • 2.
    Ahmed, Lamis
    et al.
    KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Concrete Structures.
    Guarin, Alvaro
    KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Building Materials.
    Crack propagation under water pressure2018Report (Refereed)
    Abstract [en]

    Cracks in concrete structures such as a concrete dam can be exposed to water pressure, for example, uplift pressure. The water pressure can be significant and may result in cracks propagating through the structures and thus it may result in reduced service life. However, the knowledge of water pressure within the cracks is relatively limited and is often neglected or just roughly estimated. The influence of crack opening rate on the uplift pressure distribution in the crack and the pressure variation during opening or sudden crack closure are questions needed to investigate. As an attempt to answer those questions, a pilot study presented here describes the possibilities and limitations of the proposed experimental setup; and technology (penetrability meter and tomography) as an examination method for water pressure in propagation concrete cracks. The test specimens examined here are exclusively cylinders cast of concrete with or without an initial crack.

    The penetrability meter can be used to apply water pressure and to visualize the crack opening, X-Ray computed tomography test, was performed. KTH Civil and Architectural Engineering department has organized the laboratory resources.

    The examples reported in this work show that the technology and equipment have great potential for future work on crack propagation, however, sample design and preparation, as well as testing need further development.

  • 3.
    Ansell, Anders
    et al.
    KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Concrete Structures.
    Ahmed, Lamis
    KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Concrete Structures.
    Guarin, Alvaro
    KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Building Materials.
    Datortomografi som undersökningsmetod för ung och gammal, sprutad och gjuten betong för tunnlar2016Report (Other academic)
  • 4.
    Hallberg, Daniel
    et al.
    KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Building Materials.
    Stojanovic, Bojan
    KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Building Materials.
    Akander, Jan
    (University of Gävle, Department of Technology and Built Environment.
    Långsiktig underhållsplanering av fjärrvärmenät: En förstudie av möjligheter till utveckling av LMS2007Report (Other academic)
    Abstract [en]

    amtidigt som fjärrvärme är ett effektivt sätt att leverera värme så leder en centraliserad värmeproduktion till att fler personer drabbas vid eventuella driftavbrott. Detta skapar ett behov av ökad leveranssäkerhet och kontroll av prestanda över hela fjärrvärmenätets livscykel. Genom en långsiktig planering av nätets utbyggnad och förvaltning erhålls effektivare resursanvändande och större säkerhetsmarginaler. Långsiktig planering bygger till stor del på analys av olika scenarier där såväl rådande förutsättningar som ”worst cases” kan beaktas utifrån olika aspekter (tekniska, ekonomiska, säkerhetsmässiga m.m.). Målet är att hitta optimerade åtgärder, vilket kräver systematisk hantering och bearbetning av en stor mängd information. Detta kan endast göras rationellt med hjälp av IT-verktyg. Life cycle Management System (LMS) är ett resultat av tre konsekutiva EU-finansierade forskningsprojekt där gruppen för byggnadsmaterialteknik – Högskolan i Gävle, har haft en ledande roll. Systemet innehåller utvecklade rutiner och metoder för hantering av information som ligger till grund för långsiktig planering och optimerad förvaltning av byggnadsverk. Systemmässigt är LMS uppbyggt av moduler som hanterar och analyserar data på olika sätt. Anledningen till systemets modulbaserade struktur är att det, helt eller i delar, kan anpassas mot de krav och önskemål som klienten ställer på systemet. På så sätt behöver klienten bara komplettera sitt befintliga system med de funktioner som önskas av LMS, samtidigt som denne undviker att ”kasta ut” det gamla systemet. Förstudien omfattar en litteraturstudie och analys av Gävle Energi AB:s (GEAB) drift- och underhållsdata. Förstudiens syfte är att identifiera och kartlägga de anpassnings- och utvecklingsbehov som föreligger en implementering av LMS som planeringsverktyg för GEAB:s fjärrvärmenät.

  • 5.
    Fruchter, Renate
    et al.
    Stanford University.
    Krawinkler, Helmut
    Stanford University.
    Nilvér, Kjell
    KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Building Materials.
    Björnsson, Hans
    Chalmers.
    Tech-IQ: Technology Mediated Interdisciplinary Questioning2007Report (Other academic)
    Abstract [en]

    The educational challenge of Tech IQ  is to assist students in developing an integrated understanding of  interdisciplinary, project-based teamwork through active participation in  inquiry.  To do this, the team will  create an innovative computer-mediated and question-driven learning experience.  Architecture, engineering, and management students engaged in project-based  learning typically apply their knowledge in discipline-centric inquiry, and  lack the opportunity to develop general interdisciplinary inquiry abilities in  a real-world project context.  The  research team will design, implement, test, deploy, and assess the Tech-IQ  learning interaction experiences as a pedagogic method based on a framework of  six degrees of question exploration in support of effective interdisciplinary  questioning in PBL. The team will use an information and communication  environment that leverages two of the most pervasive cognitive technologies,  i.e., speech and sketching. Using these tools will assist learners to  articulate and represent their thinking and questioning and make their level of  understanding more visible, tangible, clearer, sharable, and re-usable. These  tools will be deployed in the Architecture, Engineering, Construction  Management Global Teamwork course offered during 2006-07 at Stanford in collaboration  with KTH in Stockholm, Chalmers University  and IT University in Göteborg.

  • 6.
    Fruchter, Renate
    et al.
    Stanford University.
    Ponti, Marisa
    Göteborgs universitet.
    Krawinkler, Helmut
    Stanford University.
    Nilvér, Kjell
    KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Building Materials.
    Björnsson, Hans
    Chalmers.
    The Fishbowl: Degrees of Engagement in Global Teamwork2006Report (Other academic)
    Abstract [en]

    The project team will improve cross-disciplinary, collaborative, and geographically distributive project-based learning (PBL) by creating an innovative, computer-mediated learning experience between  students and professionals working in the fields of architecture, engineering and construction management (AEC.) Faculty and researchers from Stanford, KTH, Chalmers and the IT University of Göteborg  will design, implement, test, deploy and evaluate a learning interaction  experience (“The Fishbowl”) as a pedagogical intervention  to support knowledge transfer from professionals to students. These  competencies include alternative ways to solve problems, inquiry  and negotiation skills, and probing the boundaries between disciplines.  Deliverables from this project will include a tested and evaluated  pedagogic model, an ICT-augmented workspace, deployed and tested  in PBL at Stanford, KTH, Chalmers and IT Göteborg, the implementation of the pedagogy and ICT in an AEC Teamwork course offered in spring 2006, evaluation of learning workspaces, and student learning  and  performance assessments.

  • 7.
    Sjöström, Christer
    et al.
    KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Building Materials.
    Trinius, Wolfram
    KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering.
    Chevalier, Jean-Luc
    Life Performance of Construction Materials and Components: PeBBu Domain 1 Final Report2005Report (Other academic)
  • 8.
    Sjöström, Christer
    et al.
    KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Building Materials.
    Trinius, Wolfram
    KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering.
    North European Regional Platform: PeBBu Regional Platform 12005Report (Other academic)
  • 9. Adolfi, Bengt
    et al.
    Hameury, Stephane
    KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Building Materials.
    Jegerfors, K
    Landström, A
    Trälyftet: Ett byggsystem i massivträ för flervåningshus2005Report (Other (popular science, discussion, etc.))
    Abstract [en]

    Trälyftet" presenterar ett byggsystem - bestående av industriellt tillverkade volymer med stommar av massivträ - som gör det möjligt att bygga moderna, robusta flervåningshus av prefabricerade volymer i massivträ. Vi får ta del av forskningen bakom byggsystemet, funktionen och erfarenheterna från det första prototyphuset. Även konstruktioner och installationer beskrivs.

1 - 9 of 9
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