Abstract
Because of environmental and economic benefits, a fraction of cement is increasingly replaced by limestone fillers raising a question on to what extent limestone fillers affect the durability of cementitious materials. This work aims at understanding the effects of water/powder (w/p) ratio and limestone filler replacement on water permeability of cement pastes. A newly proposed technique using a controlled constant flow concept was applied to measure permeability of hardened cement paste samples following a factorial experimental design. It was observed that both limestone filler and w/p ratio significantly influence the water permeability. At a given w/p ratio, adding limestone filler made the microstructure coarser, especially for high w/p ratio. Nevertheless, if the comparison is based on a given water/cement (w/c) ratio instead of w/p ratio, the limestone filler replacement refined the microstructure in terms of capillary porosity and pore size distribution, resulting in permeability decreases of cement pastes. Furthermore, a modified Carmen-Kozeny relation was established which enables prediction of the permeability from capillary porosity and the critical pore diameter.
Original language | English |
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Title of host publication | International RILEM Conference on Materials, Systems and Structures in Civil Engineering 2016 |
Subtitle of host publication | segment on Concrete with Supplementary Cementitious Materials |
Editors | Ole M. Jensen, Konstantin Kovler, Nele De Belie |
Publisher | Rilem |
Pages | 141-151 |
Number of pages | 11 |
Volume | 113 |
ISBN (Electronic) | 978-2-35158-179-7 |
ISBN (Print) | 978-2-35158-178-0 |
Publication status | Published - 2016 |
Event | International RILEM Conference on Materials, Systems and Structures in Civil Engineering : Conference segment on Concrete with Supplementary Cementitious Materials - Technical University of Denmark, Lyngby, Denmark Duration: 22 Aug 2016 → 24 Aug 2016 http://www.conferencemanager.dk/MSSCE2016/home.html |
Conference
Conference | International RILEM Conference on Materials, Systems and Structures in Civil Engineering |
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Abbreviated title | MSSCE 2016 |
Country/Territory | Denmark |
City | Lyngby |
Period | 22/08/16 → 24/08/16 |
Internet address |