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Water content reflectometer application to construction materials and its relation to time domain reflectometry
KTH, School of Architecture and the Built Environment (ABE), Land and Water Resources Engineering.
2006 (English)In: Vadose Zone Journal, ISSN 1539-1663, E-ISSN 1539-1663, Vol. 5, no 1, 459-468 p.Article in journal (Refereed) Published
Abstract [en]

Moisture content measurements using time domain reflectometry (TDR) or water content reflectometry (WCR) are basic in many research areas. The goals of this study were to establish a relation between apparent dielectric number and WCR sensor output, to compare TDR and WCR calibration equations for two coarse road construction materials, and to investigate the influence of sampling volume for horizontally installed sensors. Measurements were performed in fluids of known dielectric number and in two incrementally saturated coarse materials. The effect of sampling volume was evaluated using an electrostatic finite-element model. A two-parameter equation was determined relating the apparent dielectric number to Campbell CS616 ( Campbell Scientific, Logan, UT) WCR output (r(2) > 0.99). A simple calibration can adapt the equation to individual CS616, or similar, sensors. For the finer, coarse material, a three-phase mixing model proved best, while for the coarser material no equation adequately described the measurements. Numerical simulations indicated that limited capillary rise, creating a rapid transition from wet to dry close to saturation, was the explanation, warranting caution when interpreting measurements in nearly saturated coarse materials.

Place, publisher, year, edition, pages
2006. Vol. 5, no 1, 459-468 p.
National Category
Civil Engineering
URN: urn:nbn:se:kth:diva-37595DOI: 10.2136/vzj2005.0053ISI: 000237124500039ScopusID: 2-s2.0-34547857364OAI: diva2:434379
Available from: 2011-08-15 Created: 2011-08-15 Last updated: 2012-02-08Bibliographically approved

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