Search for dissertations about: "Aggregate porosity"

Showing result 1 - 5 of 16 swedish dissertations containing the words Aggregate porosity.

2. 1. An investigation into some aspects for foamed bitumen technology

   Author : May Namutebi; Björn Birgisson; Alvaro Guarin; Umaru Bagampadde; Baoshan Huang; KTH; []
   Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Foamed bitumen; Binder ageing; Aggregate coating; Compaction; Mix design; Aggregate porosity; Civil and Architectural Engineering; Byggvetenskap;

   Abstract : Despite applications of foamed bitumen technology in pavement construction in various places around the world, there are still several aspects about this technology that are not clear. In addition, knowledge on foamed bitumen technology is mainly empirical and lacks scientific basis. READ MORE

4. 2. Gradation-Based Framework for Asphalt Mixtures

   Author : Bernardita Francisca Lira Miranda; Björn Birgisson; Terhi Pellinen; KTH; []
   Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Asphalt; aggregate gradation; packing theory; asphalt microstructure; porosity; film thickness; rutting; moisture damage.; SRA - Transport; SRA - Transport;

   Abstract : Asphalt mixture microstructure is formed by aggregates, bitumen binder and air voids. Aggregates make for up to 90% of the mixtures volume and the structure formed by them will depend mostly on their size distribution and shape. READ MORE

5. 3. Performance model for unbound grnular materials pavements

   Author : Tatek Fekadu Yideti; Björn Birgisson; Andrew Dawson; KTH; []
   Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; unbound granular materials; aggregate; packing theory; gradation; primary structure; secundary structure; permanent deformation; resilient modulus;

   Abstract : Recently, there has been growing interest on the behaviour of unbound granular material in road base layers. Researchers have studied that the design of a new pavement and prediction of service life need proper characterization of unbound granular materials, which is one of the requirements for a new mechanistic design method in flexible pavement. READ MORE

6. 4. Tabletting behaviour of aggregates : Mechanistical conception and modulation by variations in aggregate physical properties

   Author : Barbro Johansson; Uppsala universitet; []
   Keywords : MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; Pharmacy; FARMACI; PHARMACY; FARMACI; galenisk farmaci; Pharmaceutics;

   Abstract : The volume reduction mechanisms involved during compression of aggregates prepared from microcrystalline cellulose particles and effects of variations in their physical properties on their compression behaviour and compactability were studied in this thesis.The dominating volume reduction mechanisms during compression of aggregates prepared of MCC were deformation (bulk deformation and local deformation) parallel with densification, and generally the degree of fragmentation of the aggregates was minute. READ MORE

7. 5. Ageing of Asphalt Mixtures : Micro-scale and mixture morphology investigation

   Author : Prabir Kumar Das; Björn Birgisson; Nicole Kringos; Andreas Loizos; KTH; []
   Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Ageing; Aggregate packing; Atomic force microscopy; Asphalt mixture; Bitumen; Diffusion; Finite element analysis; Gradation; Micro-structure; Mixture morphology; Oxidative ageing; Surface ageing;

   Abstract : There are many variables that affect the viscoelastic properties of asphalt mixtures with time, among which age hardening may be considered one of the important ones. Age hardening of asphalt mixtures is an irreversible process, which contributes to a reduction of the durability of pavements and eventually increases the maintenance cost. READ MORE