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- W604002140 abstract "An extensive range of sealant joints was prepared using a fine- aggregate concrete substrate. The range of joints included as variables: (a) four different mechanical methods of preparing the substrate surface; (b) four different 2-part sealants (two polysulphide, two polyurethane); (c) four different conditions of priming (including epoxy and isocyanate-based primers) and (d) three different conditions of dryness of the substrates when preparing the joints ('dry', 'damp' and 'wet'). Also prepared were some joints where primer was allowed to cure for different times before applying the sealant. The joints were immersed in water at about 20 degrees C for six months, then tested in direct tension for modulus (force at 25% extension), maximum force, and extension at maximum force. A small number of dry controls for each sealant was also tested after six months dry storage. In some cases, joints were tested after immersion for shorter times at higher temperatures. In some further cases, the water absorbed by the sealants was determined by drying and weighing. The results show that there is invariably a reduction in modulus after the immersion period, a reduction which is accelerated by an increase in immersion temperature. The modulus reduction is not uniform between sealants but depend strongly upon their chemical compositions. The modulus reduction for a given sealant can be correlated approximately with the amount of water it absorbs. (A)" @default.
- W604002140 created "2016-06-24" @default.
- W604002140 creator A5058153693 @default.
- W604002140 date "1992-01-01" @default.
- W604002140 modified "2023-09-26" @default.
- W604002140 title "PERFORMANCE OF SEALANT-CONCRETE JOINTS IN WET CONDITIONS. RESULTS OF A LABORATORY TESTING PROGRAMME. VOLUME 1: MAIN RESULTS AND DISCUSSION" @default.
- W604002140 hasPublicationYear "1992" @default.
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