Estimation of water retention curve from mercury intrusion porosimetry and van Genuchten model

Leech, C, Lockington, D and Hooton, RD (2006) Estimation of water retention curve from mercury intrusion porosimetry and van Genuchten model. Aci Structural Journal, 103 2: 291-295.

Author Leech, C
Lockington, D
Hooton, RD
Title Estimation of water retention curve from mercury intrusion porosimetry and van Genuchten model
Journal name Aci Structural Journal   Check publisher's open access policy
ISSN 0889-3241
Publication date 2006-01-01
Sub-type Article (original research)
Open Access Status Not yet assessed
Volume 103
Issue 2
Start page 291
End page 295
Total pages 5
Editor Rebecca A Hartford
Place of publication United States
Publisher American Concrete Institute
Language eng
Subject C1
290899 Civil Engineering not elsewhere classified
770402 Land and water management
Abstract The water retention curve (WRC) is a hydraulic characteristic of concrete required for advanced modeling of water (and thus solute) transport in variably saturated, heterogeneous concrete. Unfortunately, determination by a direct experimental method (for example, measuring equilibrium moisture levels of large samples stored in constant humidity cells) is a lengthy process, taking over 2 years for large samples. A surrogate approach is presented in which the WRC is conveniently estimated from mercury intrusion porosimetry (MIP) and validated by water sorption isotherms: The well-known Barrett, Joyner and Halenda (BJH) method of estimating the pore size distribution (PSD) from the water sorption isotherm is shown to complement the PSD derived from conventional MIP. This provides a basis for predicting the complete WRC from MIP data alone. The van Genuchten equation is used to model the combined water sorption and MIP results. It is a convenient tool for describing water retention characteristics over the full moisture content range. The van Genuchten parameter estimation based solely on MIP is shown to give a satisfactory approximation to the WRC, with a simple restriction on one. of the parameters.
Keyword Construction & Building Technology
Engineering, Civil
Materials Science, Multidisciplinary
Adsorption
Durability
Moisture
Porosimetry
Surface Area
Cement-based Materials
Hydraulic Conductivity
Pore Structure
Concrete
Equilibrium
Porosity
Paste
Q-Index Code C1

 
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Created: Wed, 15 Aug 2007, 17:58:47 EST