Magnetic Resonance in Porous Media ( MRPM 9 ) July 13 - 17 , 2008 Schlumberger – Doll Research
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چکیده
During the past thirty years concrete has developed enormously in both strength and durability. A downside of these improvements is the increased risk of explosive spalling in case of fire. The moisture inside the concrete plays an important role in this spalling mechanism. As the temperature is increasing during a fire the water will start to boil in the concrete. However due to its low permeability the vapour transport is hindered and a large pressure will built up in the material. This pressure can ultimately lead to the explosion of the concrete during fire. This phenomenon has been observed in the various tunnel fires during the last years. In order to study the moisture transport inside concrete during heating a special Nuclear Magnetic Resonance setup was built. This setup can be placed inside a 1.5 T MRI scanner. With this setup one dimensional moisture profiles can be measured nondestructively while the concrete sample is heated up to 400 °C with heating rates of up to 10 °C/min. The setup can handle representative concrete samples up to 8 cm in diameter and 10 cm in length. Using this setup the moisture transport has been studied for various types of concrete.
منابع مشابه
10 th Bologna Conference on Magnetic Resonance in Porous Media ( MRPM 10 ) 12 th to 16 th September 2010 in Leipzig
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تاریخ انتشار 2008