Sökning: "k-value"

Visar resultat 1 - 5 av 9 avhandlingar innehållade ordet k-value.

1. 1. Studies of the efficiency of granulated blast furnace slag and limestone filler in mortars - long term strength and cloride penetration

   Författare :Dimitrios Boubitsas; Avdelningen för Byggnadsmaterial; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; k-value; beständighet; durability; kloridinträngning; cement; limestone filler; bruk; långtidsegenskaper; kalksten; chloride diffusion; slagg; chloride migration; compressive strength; granulated blast furnace slag;

   Sammanfattning : This report is the first part of the project Use of industrial by-products and filler in concrete - long term properties/durability. The aim is to improve the knowledge of long term properties/durability of cement and concrete produced using industrial by-products/fillers in order to promote an efficient, safe, reliable and increased use of such types of materials. LÄS MER

3. 2. Development of strength and heat of hydration of young concrete at low temperature - influence of granulated blast furnace slag, silica and limestone

   Författare :Monica Lundgren; Avdelningen för Byggnadsmaterial; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; låga temperaturer; värmeavgivning; betong; betonggjutning; hållfasthet; hydratation;

   Sammanfattning : The work presented in this licentiate thesis was carried out within the project task Use of industrial by-products and filler in concrete, part Early-age strength development at low temperatures in concrete with mineral additions/fillers. To improve the understanding and to increase the data available, the study investigated the development of compressive strength and heat of hydration while curing at 5°C compared with curing at 20°C. LÄS MER

4. 3. On friction in metal power compaction process

   Författare :Naghi Solimannezhad; Luleå tekniska universitet; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Maskinelement; Machine Elements;

   Sammanfattning : The present work describes different ways of measuring and studying friction in a metal powder compaction process. Reducing friction during this process will allow an increase in the density of powder components and reduce variation in the density, which is a common problem in this process. This work contain three papers. LÄS MER

5. 4. Discribing the Auto-Ignition Quality of Fuels in HCCI Engines

   Författare :Per Risberg; David E. Foster; KTH; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Auto-Ignition Quality; RON; MON; Cetane Number; HCCI; CAI and Fuels; Other engineering mechanics; Övrig teknisk mekanik;

   Sammanfattning : The Homogeneous Charge Compression Ignition (HCCI) engine is a promising engine concept that emits low concentrations of NOx and particulates and still has a high efficiency. Since the charge is auto-ignited, the auto-ignition quality of the fuel is of major importance. LÄS MER

7. 5. Adsorption of pinosylvin onto the structure of wood : mechanism and adsorption parameters

   Författare :Ildiko Mohammedne Ziegler; Luleå tekniska universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Chemistry of Interfaces; Gränsytors kemi;

   Sammanfattning : Pinosylvin and polyhydroxybenzene derivatives are natural components of wood, known for their fungicidal/fungistatic properties. These components were used as adsorbates in the present investigation. LÄS MER