Nielsen, J.
2001 Danish Building and Urban Research, ByogByg Documentation 004
Nielsen, J., (2001), Measurement of soil moisture using gypsum blocks, Danish Building and Urban Research, ByogByg Documentation 004.
Abstract:
This report describes the results of Nordtest project 1424-98 with the purpose of developing a calibration procedure for determination of soil moisture by means of gypsum blocks. The calibration procedure has been tested for repeatability and for temperature dependency. The method suggested for calibration of gypsum blocks is based on artificial soil made by mixing neat kaolin and water. The method requires knowledge of the retention curve for kaolin.
Moisture conditions in the soil surrounding a building are of great importance to the moisture conditions inside the building, and some cases of moisture problems in buildings may be due to high moisture content in the surrounding soil. In order to detect the source of water in the building, measurements of soil moisture are needed.
In soil science, gypsum blocks have been used to determine soil moisture content for the past 50 years, and several types of commercial gypsum blocks are available on the market. The gypsum blocks are provided with a generalized calibration curve. There is no individual calibration curve for the gypsum blocks and there is no information on temperature dependency. This report describes a method for calibrating gypsum blocks for soil moisture measurements.
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