Search for dissertations about: "Materiallära"

Showing result 11 - 15 of 50 swedish dissertations containing the word Materiallära.

2. 11. Hydro-mechanical properties of a water unsaturated sodium bentonite. Laboratory study and theoretical interpretation

   Author : Ann Dueck; Institutioner vid LTH; []
   Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Materiallära; Anläggningsteknik; Material technology; Construction technology; materialteknik;

   Abstract : Highly compacted bentonite has been proposed as the buffer material in the Swedish concept for the disposal of nuclear waste. To increase the knowledge of the hydro-mechanical behaviour of unsaturated swelling bentonite a series of laboratory experiments was carried out. READ MORE

4. 12. Leaching of concrete : the leaching process and its effects

   Author : Tomas Ekström; Avdelningen för Byggnadsmaterial; []
   Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; material technology; water permeability.; concrete dams; byggnadsteknik; building construction; leaching; materiallära; materialteknik;

   Abstract : The present report presents an experimental study of leaching of concrete caused by water percolating through the concrete, or by diffusion from concrete to external water in contact. An apparatus was designed and constructed in which de-ionised water could be forced, by external pressure, through a number of concrete specimens of differing characteristics. READ MORE

5. 13. Portland Cement Clinker - Composition and Hydration

   Author : Anna Emanuelson; Centrum för analys och syntes; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; Inorganic chemistry; mineralisation; hydration; polymorphism; substitutions; ferrite; aluminate; belite; alite; Portland cement clinker; phase analysis; Oorganisk kemi; Material technology; Materiallära; materialteknik;

   Abstract : The crystal structures of the main Portland cement clinker phases are reviewed and two anion centered models of Ca3SiO5 and Ca2SiO4 are presented. The effects of minor elements on the clinkering process, and on the qualitative and quantitative phase compositions of Portland cement clinker are discussed. READ MORE

6. 14. Phase development, heat of hydration and expansion in a blended cement with b-hemihydrate and anhydrite as calcium sulfate

   Author : Cecilie Evju; Centrum för analys och syntes; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; dilatation; isothermal calorimetry; in-situ synchrotron powder diffraction; ettringite; calcium sulfate; Shrinkage compensating cement; expansive cement; Materiallära; Material technology; materialteknik;

   Abstract : Expansive cements are utilised in special applications to improve properties such as cracking caused by drying shrinkage. Several types of expansive cements exist and the main hydration product responsible for the expansion is ettringite, [Ca3Al(OH)6]2(SO4)3·26H 2O. READ MORE

7. 15. Modeling the effects of knots in Structural Timber

   Author : Christina Foley; Avdelningen för Konstruktionsteknik; []
   Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Material technology; Byggnadsteknik; Building construction; three-dimensional fiber paradigm; fiber deviation; knots; annual growth layer; material matrix; knot bump; structural timber; load carrying capacity; Materiallära; critical knot; knot distance ratio; local principal material directions; stiffness; materialteknik;

   Abstract : The main purpose of the pursued research is to increase knowledge of the effects of knots in structural timber so that characteristics of weaker timber may be determined and applied to improve current grading techniques. In the process, a three-dimensional fiber paradigm was established, which describes variations of local principle material axes in timber containing knots. READ MORE