Abstract
Water vapor sorption isotherms are essential data in models to predict the service life of the cement based structures. The knowledge about sorption isotherms in the presence of supplementary cementitous materials (SCMs) is limited. This study investigates the influence of water to cement ratio (0.4, 0.5 and 0.6), and the presence of two SCMs (70% slag and 10% silica fume) on sorption isotherm in hygroscopic and above hygroscope RH ranges for paste and mortars. Dynamic vapor balance in hygroscopic rang and pressure plates above hygroscopic range are used to generate sorption isotherms. Based on Jennings model (CM-II) for C-S-H structure, desorption isotherms are divided to different parts in which different pores are emptied. The samples with silica fume and slag have higher moisture content than OPC, but, with higher amount of gel pores and lower amount of capillary pores. At low RH intervals all samples have very similar desorption curves and introduction of SCMs induce slightly increase on BET surface area. Above 30% RH, samples have different desorption curves and the initial desorption is higher than following desorption for all samples.
| Original language | English |
|---|---|
| Title of host publication | Proceedings of the First International Conference on Construction Materials and Structures |
| Publisher | IOS Press |
| Pages | 813-818 |
| ISBN (Print) | 978-1-61499-466-4, 978-1-61499-465-7 |
| DOIs | |
| Publication status | Published - 2014 |
| Event | 1st International Conference on Construction Materials and Structures - Johannesburg, South Africa Duration: 2014 Nov 24 → 2014 Nov 26 |
Conference
| Conference | 1st International Conference on Construction Materials and Structures |
|---|---|
| Country/Territory | South Africa |
| City | Johannesburg |
| Period | 2014/11/24 → 2014/11/26 |
Subject classification (UKÄ)
- Construction Management
Free keywords
- Water vapor sorption isotherms
- supplementary cementitous materials