Sökning: "moisture content"

Visar resultat 16 - 20 av 294 avhandlingar innehållade orden moisture content.

1. 16. Durability of timber members : Moisture conditions and service life assessment of bridge detailing

   Författare :Jonas Niklewski; Avdelningen för Konstruktionsteknik; []
   Nyckelord :wood; spruce; moisture; durability; decay; service life; detailing; model;

   Sammanfattning : The longevity of timber structures in exposed outdoor environments is often perceived to be unreliable as compared with that of concrete and steel structures. This situation is exacerbated to some extent by the fact that the European commission for standardization (CEN) currently provides no quantitative method for service life assessment of timber structures. LÄS MER

3. 17. A Quantitative Thermogravimetric Study on the Nonevaporable Water in Mature Silica Fume Concrete: Influence of Carbonation and Moisture Conditions

   Författare :Elisabeth Helsing Atlassi; Chalmers tekniska högskola; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; moisture; carbonation; cement composites; cement; thermogravimetric method;

   Sammanfattning : The primary goal of the project presented here was to study and quantify the influence of materials parameters (cement type, silica fume content, w/c ratio, type and dose of superplasticizers) and environmental parameters (carbonation and moisture history) on the nonevaporable water in hydrated cement composites. In order to achieve this, a thermogravimetric method which separates different types of nonevaporable water (bound in different hydrates and hydroxide) and carbonation products was developed. LÄS MER

4. 18. Moisture-induced stress and distortion of wood : A numerical and experimental study of wood's drying and long-term behaviour

   Författare :Sara Florisson; Sigurdur Ormarsson; Johan Vessby; Kent Persson; Linnéuniversitetet; []
   Nyckelord :LANTBRUKSVETENSKAPER; AGRICULTURAL SCIENCES; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; analytical method; calibration; controlled climate; creep; distortion; experimental methodology; FEM; fibre orientation; mechano-sorption; moisture transport; natural climate; Norway spruce; numerical model; three-dimensional; timber beam; validation; wood; Byggteknik; Civil engineering; Forestry and Wood Technology; Skog och träteknik;

   Sammanfattning : With the current advances made in three-dimensional modelling of wood, it is possible to provide an overall picture of moisture flow, and moisture-induced stress and deformations, whereas previously, experiments only provided local measurements. The main aim of the doctoral thesis is to investigate the possibilities of the developed three-dimensional numerical model to predict the behaviour of wood when simultaneously exposed to a mechanical load and a particular climate. LÄS MER

5. 19. Monitoring and Inspections of Timber Bridges : Moisture Content Measurements Adapted for Large Timber Constructions

   Författare :Niclas Björngrim; Olle Hagman; Roberto Crocetti; Luleå tekniska universitet; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Träteknik; Wood Science and Engineering;

   Sammanfattning : .... LÄS MER

7. 20. Wood Plastic Composites made from Modified Wood : Aspects on Moisture Sorption, Micromorphology and Durability

   Författare :Kristoffer Segerholm; Ove Söderström; Magnus Wålinder; Mats Westin; Pia Larsson Brelid; Per Johan Gustafsson; KTH; []
   Nyckelord :MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; Wood plastic composites; WPC; acetylation; heat treatment; furfurylation; moisture sorption; micromorphology; decay; UV laser; soil test; Biomaterials; Biomaterial;

   Sammanfattning : Wood plastic composite (WPC) materials have seen a continuous market growth worldwide in the last decade. So-called extruded WPC profiles are today mainly used in outdoor applications, e.g. decking, railing and fencing. LÄS MER