Journal
CEMENT AND CONCRETE RESEARCH
Volume 39, Issue 4, Pages 324-328Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.cemconres.2009.01.011
Keywords
Drying; Hydration; Pore size distribution; Mortar; Embedded NMR sensor
Funding
- NSERC
- Instituto Politecnico, Nacional de Mexico
- CONACYT from Mexico
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Providing adequate moisture content in cement-based materials is important during hydration of the cement paste to ensure proper development of their mechanical and durability properties. Subsequently, water is involved in the deterioration of concrete either as a pure liquid or by carrying aggressive species. This paper explores the use of small embedded NMR sensors to monitor evaporable water loss in Portland cement mortars. Results indicate that these sensors are effective in detecting loss of evaporable water due to hydration and drying. During drying, the mass loss is linearly proportional to the NMR signal loss. In addition, the amount of evaporable water detected with the sensor has a good correlation with the amount of evaporable water in a companion specimen tested in a traditional low field magnet by NMR and by gravimetric measurements. (C) 2009 Elsevier Ltd. All rights reserved.
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