Influence of concrete relative humidity on the amplitude of Ground-Penetrating Radar (GPR) signal

Title: Influence of concrete relative humidity on the amplitude of Ground-Penetrating Radar (GPR) signal
Author(s): S. Laurens, J.-P. Balayssac, J. Rhazi, G. Arliguie
Paper category : journal
Serial title: Materials and Structures
Abreviated Serial title: Mater. Struct.
ISSN: 1359-5997
Publisher: RILEM Publications SARL
Volume: 35
Issue: 248
Issue date: 2002-05-01
Publication year: 2002
Pages: 198 - 203
Total Pages: 6
Nb references: 14
Language: English

Abstract: The objective of the present paper is to show an experimental method allowing the characterisation of Biot ’s hydro-mechanical coupling coeff icient for cement mortar.
This coefficient results from the mathematical formulation of a thermo-hygro-mechanical coupling model for non-saturated media [3,8,9,11 ].
In the literature,the expression of Biot ’s coefficient is based on an empirical formula.
The proposed method of its identification is based on two experiments:the dimensional variation tests and the characterisation of the elastic properties as a function of different relative humidity.
We deduce Biot ’s coefficient by using the thermal-porous-elastic behaviour law of Coussy [2,3 ].
In the literature,liquid Biot ’s coefficient b(l) is often approached with the degree of liquid saturation S(l) .
By comparing the results of liquid Biot ’s coefficient b(l) determined experimentally and the coefficient of liquid saturation S(l) , we show a good agreement between the two coefficients for small to moderate relative humidity.
For important relative humidity (i.
e.
higher than 70%),the value of liquid Biot ’s coefficient is slightly lower than saturation.

Online publication: 2002-03-27
Classification: Scientific Reports
Publication type : full_text
Public price (Euros): 0.00
doi: 10.1617/13815