Journal
CEMENT AND CONCRETE RESEARCH
Volume 42, Issue 2, Pages 384-396Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.cemconres.2011.11.005
Keywords
High performance concrete; Temperature; Adsorption; Waste management; Radioactive waste
Ask authors/readers for more resources
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 degrees C, and (2) showing whether these may be simply described by adsorption and capillarity. Results at 20 degrees 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 degrees 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. (C) 2011 Elsevier Ltd. All rights reserved.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available