期刊
CEMENT & CONCRETE COMPOSITES
卷 32, 期 1, 页码 84-91出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.cemconcomp.2009.10.005
关键词
Capillary absorption; Lucas-Washburn equation; Concrete; Neutron Radiography
资金
- Jolef Stefan Institute
Capillary absorption kinetics of concrete-ethylene glycol system was studied with respect to concrete matrix porosity and liquid viscosity. Porosity of specimens was altered by air-entraining agents and superplasticizers. Liquid which doesn't react with cement gel was chosen for the experiment in order to study the reasons for deviation from Lucas-Washburn equation observed in concrete-water system. Viscosity of ethylene glycol changes from similar to 23 to 2 mPa s in the temperature range from 20 to 100 degrees C. The values of the capillary coefficient were determined at 20, 60 and 100 degrees C using Neutron Radiography and were found to be in the range from similar to 1.5 to 4.9 MM h(-1/2). The results show that the Lucas-Washburn equation in concrete-ethylene glycol system is valid only for similar to 25 h, which indicates that swelling and rehydration of cement gel are not the main reasons for deviation observed in concrete-water system. (C) 2009 Elsevier Ltd. All rights reserved
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