Brandt, Erik

Hansen, Ernst Jan de Place

Hansen, Kurt Kielsgaard

Møller, Eva B.

Kielsgaard Hansen, Kurt

Moisture assessment by fast and non-destructive in situ measurements

A building inspection report is made in connection with the resale of 90% of all single-family houses in Denmark. The building inspection is visual with the option of using simple hand-held instruments but with no destructive measures allowed. However, many construction components have a highmoisture content, which is not revealed by this inspection. The moisture content may become a problem for the buyers. This problem might have been avoided if the moisture content of the Building materials was measured on inspection. This is easily done in wood-based materials but for example inconcrete and brick the moisture content is difficult to determine within a short period time. There is political pressure to include moisture measurements in the report if it does not increase the cost of the inspection significantly.Therefore, a moisture-measuring method is needed that is non-destructive, fast to use, easily applicable and suitable for most porous building materials. Furthermore, the measurements must be reliable at the high end of the hygroscopic area and describe absolute moisture content or corresponding relative humidity. The existing methods for moisture measuring cannot meet these requirements, and those who come close are very expensive. This paper describes a method under development; with simple means and within a few hours, the method can measure the absolute moisture content or the corresponding relative humidity in constructions in a non-destructive way.The method is based on measurements of the relative humidity of the air in a small hood placed tightly and sealed to the surface of the construction. Results with aerated concrete covered with acrylic paint are presented.A building inspection report is made in connection with the resale of 90% of all single-family houses in Denmark. The building inspection is visual with the option of using simple hand-held instruments but with no destructive measures allowed. However, many construction components have a highmoisture content, which is not revealed by this inspection. The moisture content may become a problem for the buyers. This problem might have been avoided if the moisture content of the Building materials was measured on inspection. This is easily done in wood-based materials but for example inconcrete and brick the moisture content is difficult to determine within a short period time. There is political pressure to include moisture measurements in the report if it does not increase the cost of the inspection significantly.Therefore, a moisture-measuring method is needed that is non-destructive, fast to use, easily applicable and suitable for most porous building materials. Furthermore, the measurements must be reliable at the high end of the hygroscopic area and describe absolute moisture content or corresponding relative humidity. The existing methods for moisture measuring cannot meet these requirements, and those who come close are very expensive. This paper describes a method under development; with simple means and within a few hours, the method can measure the absolute moisture content or the corresponding relative humidity in constructions in a non-destructive way.The method is based on measurements of the relative humidity of the air in a small hood placed tightly and sealed to the surface of the construction. Results with aerated concrete covered with acrylic paint are presented

Moisture assessment by fast and non-destructive in-situ measurements

A building inspection report is made in connection with the resale of 90% of all single-family houses in Denmark. The building inspection is visual with the option of using simple hand-held instruments but with no destructive measures allowed. However, many construction components have a high moisture content, which is not revealed by this inspection. The moisture content may become a problem for the buyers. This problem might have been avoided if the moisture content of the Building materials was measured on inspection. This is easily done in wood-based materials but for example in concrete and brick the moisture content is difficult to determine within a short period time. There is political pressure to include moisture measurements in the report if it does not increase the cost of the inspection significantly. Therefore, a moisture-measuring method is needed that is non-destructive, fast to use, easily applicable and suitable for most porous building materials. Furthermore, the measurements must be reliable at the high end of the hygroscopic area and describe absolute moisture content or corresponding relative humidity. The existing methods for moisture measuring cannot meet these requirements, and those who come close are very expensive. This paper describes a method under development; with simple means and within a few hours, the method can measure the absolute moisture content or the corresponding relative humidity in constructions in a non-destructive way. The method is based on measurements of the relative humidity of the air in a small hood placed tightly and sealed to the surface of the construction. Results with aerated concrete covered with acrylic paint are presented

Online Research Database In Technology

http://vbn.aau.dk/files/205507207/Moisture_assessment_by_fast_and_non_destructive_in_situ_measurements.pdf

Moisture assessment by fast and non-destructive in situ measurements

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Online Research Database In Technology