Thesis defence X. Ouyang: cement paste system
25 September 2017 10:00 - Location: Aula, TU Delft - By: Webredactie
Filler-hydrates Adhesion Properties in Cement Paste System. Development of Sustainable Building Materials. Promotor: Prof.dr.ir. K. van Breugel (CiTG).
Adhesion between filler particles and reaction products (mainly, C-S-H) has an influence on the strength of blended cement paste. However, filler-hydrates adhesion properties and their effect on the strength of blended cement paste are not quite well understood yet. The basic questions why filler particles and reaction products adhere to each other in blended cement paste, and how the chemistry and surface characteristics of fillers affect this adhesion, are rarely addressed and need further research. The aim of this project is to study the filler-hydrates adhesion properties in blended cement paste system. In this study, the bond strength between the filler and hydrates was evaluated. The filler-hydrates adhesion mechanisms in blended cement paste system were investigated. It was concluded that calcium ions chemically adsorbed at limestone surfaces led to the formation of a relatively strong bond (most likely, ‘ionic-covalent’ bond) between a limestone particle and C-S-H. By contrast, calcium ions electrostatically adsorbed at micronized sand surfaces resulted in an attractive ion-ion correlation force and hence a relatively weak bond between a micronized sand particle and C-S-H.
For access to theses by the PhD students you can have a look in TU Delft Repository, the digital storage of publications of TU Delft. Theses will be available within a few weeks after the actual thesis defence.