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Effect of temperature on the water retention properties of two high performance concretes
- Source :
-
Cement & Concrete Research . Feb2012, Vol. 42 Issue 2, p384-396. 13p. - Publication Year :
- 2012
-
Abstract
- Abstract: This contribution aims at (1) determining experimentally the first desorption isotherms of two high performance concretes (based on CEM I and CEM V cements), at three different temperature levels T =20, 50 and 80°C, and (2) showing whether these may be simply described by adsorption and capillarity. Results at 20°C compare well with recently published results; in particular, an important desorption is observed at high RH (≥98%). A simple pore network model, based on Kelvin–Laplace''s capillary theory, is implemented, and shows the existence of two main de-saturation modes, one at high pore radii (capillary pores), the other for pore radii on the order of a few nanometers (C-S-H porosity), where desorption is shown to occur. A complementary drying mechanism is evidenced at 80°C, which is attributed to ettringite and/or C-S-H degradation. Finally, proper numerical fitting of all isotherm data is achieved using the well-known three-parameter BSB model. [Copyright &y& Elsevier]
Details
- Language :
- English
- ISSN :
- 00088846
- Volume :
- 42
- Issue :
- 2
- Database :
- Academic Search Index
- Journal :
- Cement & Concrete Research
- Publication Type :
- Academic Journal
- Accession number :
- 71335866
- Full Text :
- https://doi.org/10.1016/j.cemconres.2011.11.005