Sökning: "concrete"

Visar resultat 1 - 5 av 877 avhandlingar innehållade ordet concrete.

  1. 1. Hydrophobic Impregnation of Concrete Structures Effects on Concrete Properties

    Detta är en avhandling från Stockholm : KTH

    Författare :Anders Selander; KTH.; [2010]
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; hydrophobic impregnation; silane; siloxane; concrete; surface treatment; water repellent agent; building protection; impregnering; betong; silan; siloxan; ytbehandling; TECHNOLOGY Civil engineering and architecture; TEKNIKVETENSKAP Samhällsbyggnadsteknik och arkitektur;

    Sammanfattning : Hydrophobic impregnations often referred to as water repellent agents, today mainly consisting of alkylalkoxysilanes, are often used on concrete to prolong the service life of the structure. This is accomplished by protecting the reinforcement bars from chlorides or by changing the moisture content inside. LÄS MER

  2. 2. Ultrafine particles in concrete Influence of ultrafine particles on concrete properties and application to concrete mix design

    Detta är en avhandling från Stockholm : KTH

    Författare :Carsten Vogt; KTH.; [2010]
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; concrete; ultrafine particles; cement replacement; particle grading; TECHNOLOGY Materials science Construction materials; TEKNIKVETENSKAP Teknisk materialvetenskap Konstruktionsmaterial;

    Sammanfattning : .... LÄS MER

  3. 3. Upgrading concrete bridges post-tensioning for higher loads

    Detta är en avhandling från Luleå : Luleå tekniska universitet

    Författare :Jonny Nilimaa; Luleå tekniska universitet.; [2013]
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Civil engineering and architecture - Building engineering; Concrete; Bridges; Upgrading; Strengthening; Shear; Field testing; Post-tensioning; Prestressing; Samhällsbyggnadsteknik och arkitektur - Byggnadsteknik; Structural Engineering; Konstruktionsteknik;

    Sammanfattning : There are a great number of old structures around the world, some of which were designed for completely different purposes than in their current application. Swedish railway bridges were for example only designed for maximum axle loads of 200 kN in the beginning of the 20th century, while the highest axle loads of today are twice as high. LÄS MER

  4. 4. Concrete Structures Subjected to Blast and Fragment Impacts - Numerical Simulations of Reinforced and Fibre-reinforced Concrete

    Detta är en avhandling från Chalmers University of Technology

    Författare :Ulrika Nyström; Chalmers tekniska högskola.; Chalmers University of Technology.; [2008]
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Konstruktionsteknik; Construction engineering; Concrete; weapon effects; blast wave; fragment impact; numerical simulations; fibre-reinforced concrete; reinforced concrete; SDOF;

    Sammanfattning : Concrete is widely used in design of protective structures due to its good energy-absorbing characteristics under high pressures and, when properly reinforced, ductile behaviour. Nevertheless, the response of concrete structures subjected to severe dynamic loading differs from their static behaviour, on a structural level but also on a material level. LÄS MER

  5. 5. Hardening concrete measurments and evaluation of non-elastic deformation and associated restraint stresses

    Detta är en avhandling från Luleå : Luleå tekniska universitet

    Författare :Hans Hedlund; Luleå tekniska universitet.; [2000]
    Nyckelord :Structural Engineering; Konstruktionsteknik;

    Sammanfattning : If a structural member of hardening concrete is restrained to some degree against expansion and contraction during the heating phase of the hydration process and the subsequent contraction phase, stresses will be induced. The issue of primary interest is whether or not these induced stresses will lead to cracking. LÄS MER