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Abstract
No aged built up membranes have been recycled yet, though they occupy more than half of about 90 million square meters in area of the waterproofing membranes newly applied every year in Japan. This paper describes the feasibility of recycling of aged asphalt obtained from built up membranes that are over service life. First, the authors tried to develop the method to squeeze aged asphalt from an old roofing membrane, and could successfully obtain aspahlt from 50-70% in weight from 13 year old membrane by hot press technique at about 100C. Reduction of resins, aromatics and saturated hydrocarbons in the aged asphalt, compared to original one, were found out by a component analysis. Then, process oil was added to make the property of it recover. Penetration, softening point and slippage length of it was measured, and it was found out that the former two reached to the original level and the latter did not. Therefore, the mixing of some volume of new asphalt to it was further attempted to improve the slippage resistance. The compound of 45% of the aged asphalt, 5% of process oil and 50% of new asphalt was finally considered to be available as asphalt for built up roofing membranes.
No aged built up membranes have been recycled yet, though they occupy more than half of about 90 million square meters in area of the waterproofing membranes newly applied every year in Japan. This paper describes the feasibility of recycling of aged asphalt obtained from built up membranes that are over service life. First, the authors tried to develop the method to squeeze aged asphalt from an old roofing membrane, and could successfully obtain aspahlt from 50-70% in weight from 13 year old membrane by hot press technique at about 100C. Reduction of resins, aromatics and saturated hydrocarbons in the aged asphalt, compared to original one, were found out by a component analysis. Then, process oil was added to make the property of it recover. Penetration, softening point and slippage length of it was measured, and it was found out that the former two reached to the original level and the latter did not. Therefore, the mixing of some volume of new asphalt to it was further attempted to improve the slippage resistance. The compound of 45% of the aged asphalt, 5% of process oil and 50% of new asphalt was finally considered to be available as asphalt for built up roofing membranes.
Date
6/1998
6/1998
Author(s)
Kyoji Tanaka; Katsuaki Sekihara; Hiroshi Ishiguro
Kyoji Tanaka; Katsuaki Sekihara; Hiroshi Ishiguro
Page(s)
209-219
209-219
Keyword(s)
recycle; asphalt; built up membrane; performance; hot press; process oil
recycle; asphalt; built up membrane; performance; hot press; process oil