Journal
CONSTRUCTION AND BUILDING MATERIALS
Volume 22, Issue 3, Pages 250-256Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.conbuildmat.2006.08.021
Keywords
pore system of concrete; ground penetrating radar; water; curing history of concrete
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This paper describes a series of experiments in characterizing the pore systems of mature and hardened air-cured and water! cured concrete specimens. The characterization was achieved by measuring the real part of complex permittivity (epsilon') and energy attenuation (dB/m) through continuous injection of pressurized fresh water over a period of 48 h in each test run. The measurements were based on coupling a 1 GHz Ground Penetrating Radar (GPR) on the surfaces of concrete specimens. At different degrees of water saturation (S.) received by the specimens, the air-cured and water-cured concrete specimens were characterized by recognizing different patterns depicted in the plots of epsilon' vs S-w and dB/m vs S-w. These differences in patterns are attributed to the pore size distributions, as a result of different curing histories. (C) 2006 Elsevier Ltd. All rights reserved.
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