Sökning: "diffusion in cement"

Visar resultat 11 - 15 av 22 avhandlingar innehållade orden diffusion in cement.

1. 11. Climate Change and Industrial Technology Transfer. A Study of Chinese Conditions

   Författare :Joakim Nordqvist; Miljö- och energisystem; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Environment; Emissions; China; Development; Bureaucracy; Cement; Miljöteknik; kontroll av utsläpp; pollution control; Environmental technology; Technology management; Sustainability; Policy; Energy; Modernisation;

   Sammanfattning : Motivated by concerns about anthropogenic climate change, this thesis contributes to the better appreciation of mechanisms that would allow actors in China, foreign as well as Chinese, to exert a positive influence on the country's industrial technology status. China is the world's second largest emitter of greenhouse gases - the lions' share of which emanates from industrial and electricity production. LÄS MER

3. 12. Reducing Radon Gas Emissions in Concrete

   Författare :Magnus Döse; Johan Silfwerbrand; Franz Josef Maringer; KTH; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Radon gas; emissions; health; concrete; building materials; ionizing radiation; Betongbyggnad; Concrete Structures;

   Sammanfattning : Several compulsory regulations and recommendations regarding ionising radiation for building products have been introduced in recent years. Furthermore, industry-affiliated aggregate and concrete companies strive to implement environmental goals that should be fulfilled regarding building materials. LÄS MER

4. 13. Modeling the influence of magnesium from alternative raw materials on the chemistry of Portland cement clinker

   Författare :Erik Viggh; Rainer Backman; Dan Boström; Bo Björkman; Umeå universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Thermodynamic modeling; process modeling; Portland cement; clinker; periclase; magnesium oxide; alite; Scheil calculation; solid solutions; Physical Chemistry; fysikalisk kemi;

   Sammanfattning : The methods used in this thesis work were a combination of computational and modeling based laboratory experiments.Thermodynamic process modeling of the cement clinker process offers a tool for evaluating how changes in raw materials and process parameters affect the clinker quality. LÄS MER

5. 14. Chloride initiated reinforcement corrosion in marine concrete

   Författare :Paul Sandberg; Avdelningen för Byggnadsmaterial; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; w c ratio; cover thickness; chloride penetration; service life prediction; corrosion cells; chloride thresholds; field exposure tests; marine concrete; pozzolans; reinforcement corrosion; chloride binding; Building construction; Byggnadsteknik;

   Sammanfattning : Factors affecting the total chloride threshold for initiation of pitting corrosion in reinforced concrete were investigated by means of field and laboratory exposure tests. Factors affecting the chloride penetration into concrete were also investigated by means of field tests. The thesis consists of a summary (86 p.) and 11 papers attached. LÄS MER

7. 15. Material Properties of Bulk Hydrophobic Concrete in a Nordic Environment

   Författare :Patrick Rogers; Johan Silfwerbrand; Tang Luping; KTH; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; alkyl alkoxysilane; capillary suction; chloride ingress; concrete; hydrophobic agents; triacylglycerides; Betongbyggnad; Concrete Structures;

   Sammanfattning : Concrete in its unaltered form allows the mass transfer of fluids into and out of its microstructure. These fluids can contain detrimental solutes which change the chemistry of the cement paste and/or the corrosion properties of the reinforcement bars, most noticeably hydrogen carbonates (HCO3-), oxygen (O2) and chloride ions (Cl-). LÄS MER