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原文传递 Rubber Joint Seals for Roads and Airfields - Evaluation of Performance and Durability

题名：	Rubber Joint Seals for Roads and Airfields - Evaluation of Performance and Durability
关键词：	evaluation；seal；roads；joint；forman；perform；field；temperature；epdm；function
摘要：	Rubber Joint Seals for Roads and Airfields – Evaluation of Performance and Durability Joint seals for use in construction joints in roads and airfields were examined in respect to their performance, within a wide range of temperature. Attention was paid to very slow movements in joints and to compression set of materials. Three EPDM seals were used. The seals were subjected to changing temperature and synchronised movement of the joint. The expansion force (compression force) of the seals, which is responsible for keeping the seal in place and for preventing penetration of water and dust, was recorded continuously. A seal was judged as not functioning well when the expansion force was reduced to zero. A comparison between various seals was difficult to make as the manufacturers have specified various working ranges. Apart from that, only one EPDM seal functioned well at -30 °C. The other two EPDM seals hardly managed to function at -20 °C. The testing of the EPDM joint seals showed that the compression set in the material after ageing is a limiting factor for the function of a seal. Already after 30 days ageing at +70 °C two of the seals ceased to function at -20 °C. One seal managed 30 days ageing but ceased to function at -30 “C after 60 days ageing. The compression force decreased significantly also at +25 °C after the ageing. The results from the investigation show the importance of performing a function test on prefonned joint seals, within the entire field of application, in order to verify the properties specified by the manufacturers. The proposed test procedure makes it possible to determine limits in working range and temperature for joint seals. The method is also suitable to evaluate the influence of the environmental factors like temperature, liquid chemicals, ITZ-light, ozone, ect on the performance of joint seals.
报告类型：	科技报告