1985•Publication of: EUROBITUMERequires access
DEVELOPMENT PROCESS FOR MODIFIED JOINT SEALANTS IN SWEDEN --BITUMEN, FLEXIBLE AND DURABLE. 3RD EUROBITUME SYMPOSIUM 1985, THE HAGUE, NETHERLANDS, SEPTEMBER 11-13, 1985
A Warg
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Abstract
In 1981 a study was initiated by the users of sealants to evaluate their long time performance especially in air field use. It was found that most of the modified products did not meet the requirements with respect to ageing in these cases where severe movements occurred. A preliminary list of requirements was set up, and the first result of the development work was field tested in 1983. This showed that further work was needed to reduce the stiffness of the sealant so it could move even at very low temperatures. New requirements were formulated, laboratory work proceeded and an improved quality was field tested in 1984. Three out of four test sites show good performance so far. The experience from the field tests are that it is necessary to look upon a sealant as a part of a system where all properties which influence the performance must be known in order to achieve an acceptable result. Along with correct properties in the material used it is necessary to know in which environment it will work. Important factors to consider are such as climatic, chemical, mechanical and temperature influence. Other very important parts of the system are the methods and equipment used for cleaning and preparing the joints and applying the material. All these things mean that a proper education of the crews handling the materials and the technique is needed. For this reason tentative instruction has been worked out. Details are given of viscosity, softening point, penetration, elongation at break, tensile strength, elongation, flow, elongation after ageing. Further work involves testing of performance when application takes place in wet conditions and the influence of water and salt during long time exposure. When a final stage is reached a specification based on functional properties of the material will be set up. For the covering abstract of the symposium see IRRD 815173.