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This experimental setup includes two samples of buried steel pipes, one provided with an impressed current cathodic protection (ICCP) system and the other left unprotected - in a manipulated artificial environment.
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This paper presents the diagnostic work undertaken to determine the cause of failing coating and spalling block on the exterior of a commercial building in northern Illinois. The field assessment methods used to diagnose the problems including non-destructive and destructive methods for determining moisture content in the masonry, infrared thermography, and visual assessments are described.
The moisture assessment was determined by using a combination of 4 different methods rather than using one single method. On previous projects, the consultants had experience with the inaccuracy of some of the methods.
The importance of moisture testing of concrete floors cannot be stressed enough. Moisture is a leading cause of coatings failures on concrete floors. There are many ways moisture can affect floor coatings on concrete. Moisture testing alone is not sufficient enough at detecting all of the potential problems. Inspecting a building prior to performing any tests will provide a much clearer picture of the potential problems moisture in both liquid and vapor form can pose.
We have seen a number of concrete floor finish failures caused by moisture attack from the concrete substrate. In many instances, moisture tests were conducted prior to installing the floor covering/finish to assess the moisture content of the concrete substrate. The results of the tests suggested the concrete was dry enough to install the flooring, but failure was induced by moisture in the floor assemble.
This paper provides a description of the calcium chloride and relative humidity test procedures, the significance of the results, tips on interpreting the results, and the limitations of the test methods. We also present some of the other techniques used to measure moisture in concrete floor slabs, that are not as popular as the calcium chloride and relative humidity tests.