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Measurement of high humidity in cementitious material at an early age
CBI - Cement- och betonginstitutet.
1990 (English)Report (Refereed)
Abstract [en]

When assessing the moisture state in a cementitious material, measuring the relative humidity (RH) is preferable to other methods due to its universal value in connection with comparisons between different materials, between different degrees of maturity and in connection with the influence of other adjacent materials._x000D_ _x000D_ The use of capacitive RH meters requires an accurate and uniform methodology to achieve satisfactory accuracy and precision. A proposal for a methodology of this kind is provided in the present report. For materials at a very early age of maturity, the methodology has been developed for measuring the RH during 2 hours 45 minutes with an accuracy of up to + or - 1-1.7 % RH._x000D_ _x000D_ The use of capacitive RH meters requires that personnel be trained both in maintenance and measurement procedures._x000D_ _x000D_ For many cementitious materials, it takes a long time (days or weeks, depending on external conditions and the thickness of the material) to obtain the original RH level after drilling measurement holes. Consequently, the insertion of test tubes directly after casting is recommended. If this is not possible, or if the climatic conditions at the measurement site are difficult, it is preferable to measure the RH on material specimens taken in situ. This measurement can be carried out in a suitable environment, for example in a laboratory._x000D_ _x000D_ A detailed error analysis of the total rneasurement error is presented. This analysis can serve as a basis for calculations of the total measurement accuracy in connection with RH measurement under different external conditions and with different capacitive RH meters.

Place, publisher, year, edition, pages
Swedish cement and concrete research institute , 1990. , p. 67
Series
CBI rapport, ISSN 0346-8240 ; 90:3
National Category
Materials Engineering
Identifiers
URN: urn:nbn:se:ri:diva-2972OAI: oai:DiVA.org:ri-2972DiVA, id: diva2:960577
Note
779 Går att beställa: kontakta eva.lundgren@cbi.seAvailable from: 2016-09-07 Created: 2016-09-07Bibliographically approved

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