Rubber Joint Seals for Roads and Airfields. Evaluation of Performance and211 Durability

摘要

Joint seals for use is construction joints in roads and airfields were examined211u001ein respect to their performance, within a wide range of temperature. Attention 211u001ewas paid to very slow movements in joints and to compression set of materials. 211u001eThree EPDM seals were used. The seals were subjected to changing temperature and 211u001esynchronized movement of the joint. The expansion force (compression force) of 211u001ethe seals, which is responsible for keeping the seal in place and for preventing 211u001epenetration of water and dust, was recorded continuously. A seal was judged as 211u001enot functioning well when the expansion force was reduced to zero. A comparison 211u001ebetween various seals was difficult to make as the manufacturers have specified 211u001evarious working ranges. Apart from that, only one EPDM seal functioned well at -211u001e30 deg C. The other two EPDM seals hardly managed to function at -20 deg C.