Abstract
Commercial elastomeric bridge bearing (EBB) pad is dominated by the laminated type. Laminated EBB pad comprises of rubber composite layers which are arranged intermittently among the thin steel plates. The rubber composite uses natural rubber or chloroprene synthetic rubber as the base elastomer. Local EBB pad industries mostly produce natural rubber bridge bearing pad type due to the enormous availability of natural rubber in Indonesia. However, the quality of natural rubber bridge bearing pad product often cannot fulfil the standard requirement in compression set and accelerated aging parameters. The research studied the design of EBB pad compound formula based on natural rubber type. The EBB compound formulas were prepared by varring the curing system such as sulphur (efficient and semi-efficient) and peroxide curing system. Designing the compound formula was in accordance to the methods required in improving the compression set and accelerating aging quality of natural rubber bridge bearing pad. The result of curing characteristic of the natural rubber bridge bearing pad compound showed that peroxide curing system gave the longest optimum curing time. Further, sulphur curing system produced high crosslink density followed with good mechanical properties of natural rubber bridge bearing pad vulcanizate. The compression set value of natural rubber bridge bearing pad vulcanizates which were obtained by efficient and semi-efficient curing systems as 14.09% and 24.81%, respectively were regarded to be below the maximum requirement (25%). The peroxide curing system was not recommended due to the high compression set value of 40.68%. Meanwhile, maximum percent changes of tensile properties and retention values which indicated accelerated aging parameter of natural rubber bridge bearing pads were formed either by sulphur and peroxide curing system could fulfilled the standard requirement of EBB Duro 70 refered to SNI 3967:2013.
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