The paper describes and evaluates five different instruments for measuring the relative humidity (RH) in concrete structures. The instruments work according to different principles. The evaluation of the instruments includes tests for linearity, drift over time, hysteresis and repeatability, and it is performed by use of saturated salt solutions in the laboratory. Further, the five different instruments are placed in the same concrete, and the instruments readings are followed during drying of the concrete for 43 days. The laboratory tests and the measurements in the concrete show that most of the instruments work well.
|Title of host publication||Papers and Abstracts from the Third International Symposium on Humidity and Moisture|
|Place of Publication||Tedddington, UK|
|Publisher||National Physical Laboratory, Teddington|
|Publication status||Published - 1998|
|Event||Third International Symposium on Humidity and Moisture - London|
Duration: 1 Jan 1998 → …
|Conference||Third International Symposium on Humidity and Moisture|
|Period||01/01/1998 → …|
Hansen, K. K., & Christensen, S. L. (1998). Drying of concrete. Part I: A comparison of instruments for measuring the relative humidity in concrete structures. In Papers and Abstracts from the Third International Symposium on Humidity and Moisture (pp. 279-287). National Physical Laboratory, Teddington.