Abstract
Moisture is decisive for a large number of binding and transport processes in high performance concrete affecting the durability, shrinkage and performance in various envi-ronments. An experimental study on the moisture transport properties of 20 concrete mixes was made during seven years, with type of binder, additives and water-binder ratio as parameters. An upside-down glass cup method was used to obtain the steady-state flow through concrete discs.
The moisture diffusion coefficient decreases with a lower water-binder ratio, increasing amount of silica fume, espe-cially when combined with fly ash and it continues to decrease also after four years for w/B lower than 0.40. The moisture diffusion coefficient is much less moisture dependent for HPC than for normal concrete, which means that steady-state moisture profiles through HPC structures will be almost linear. Long-term moisture profiles in sub-merged HPC will be affected by self-desiccation for a very long time because of the extremely small moisture flow.
The moisture diffusion coefficient decreases with a lower water-binder ratio, increasing amount of silica fume, espe-cially when combined with fly ash and it continues to decrease also after four years for w/B lower than 0.40. The moisture diffusion coefficient is much less moisture dependent for HPC than for normal concrete, which means that steady-state moisture profiles through HPC structures will be almost linear. Long-term moisture profiles in sub-merged HPC will be affected by self-desiccation for a very long time because of the extremely small moisture flow.
| Original language | English |
|---|---|
| Pages (from-to) | 641-649 |
| Journal | Materials and Structures |
| Volume | 35 |
| Issue number | 10 |
| Publication status | Published - 2002 |
| Externally published | Yes |
Subject classification (UKÄ)
- Materials Engineering
Free keywords
- moisture
- Concrete
- moisture transport