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Home  >  Journal list  >  Journal of the Society of Materials Science, Japan  >  Vol.56  No.8 (2007)  >  pp.707-712

Journal of the Society of Materials Science, Japan
<<Previous article Vol.56  No.8 (2007)   pp.707 - 712 Next article>>

Investigation on Estimation Method for Water Content of Fresh Concrete Using Scattering-Type Neutron Moisture Meter

Isao UJIKE1), Takuya OKADA2), Shoji KAKIHIRA3) and Kazuaki ARII4)
1) Graduate School of Sci. and Eng., Ehime Univ.
2) Sumimec Eng. Ltd.
3) Cyclotron Application Tech., S.H.I Examination & Inspection Ltd.
4) Inspection Eng., S.H.I Examination & Inspection Ltd.


In order to assure high accuracy in estimation of water content of fresh concrete by the neutron moisture meter, the establishment of a suitable calibration curve is the most important. In this study, fine aggregate containing the required amount of water in a container with fixed capacity is measured with the scattering-type neutron moisture meter. And the calibration curve is obtained from the relationship between the measured neutron counting and the amount of water added to fine aggregate. The kind of fine aggregate hardly influences the neutron counting. The neutron counting becomes large with the increase of particle size of fine aggregate, even when added water amount is the same. However, use of fine aggregate not less than 2.50 in fineness modulus dose not noticeably affect the neutron counting. The method with calibration curve using fine aggregate can evaluate the water content of fresh concrete with a good accuracy.


Keyword:
Fresh concrete, Water content, Neutron moisture meter, Calibration curve, Fine aggregate

Received: November 06, 2006
Published online: August 15, 2007
Copyright (c) 2007 by The Society of Materials Science, Japan

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