| 摘要 |
The present invention relates to a novel SBS modified mastic asphalt mixture with enhanced durability which can be favorably used in thin bridge-decks surfacing by lowering the execution temperature and to a pavement method for mastic asphalt of steel deck bridge which desirably uses the same. The SBS modified mastic asphalt mixture according to the present invention comprises 7-9wt% of SBS modified mastic asphalt binder including 73.8-79.8wt% of normal asphalt binder having 60-80 of penetration index, 8.2-8.9wt% of SBS modifier, 9.9-14.8wt% of TLA (Trinidad Lake Asphalt), and 1.5-3.5wt% of warm additive; and 91-93wt% of mixed aggregates having a particle size of 13 mm or less. The SBS modifier is a thermoplastic elastomer having 100,000-220,000 of weight-average molecular weight, 25-35wt% of styrene contents, 65-75wt% of butadiene contents, and 83% or more of tri-block copolymer combination ratio among the total block copolymers. Tackifiers without double-bond and a plasticizer are added and mixed in the SBS modifier. [Reference numerals] (AA) Asphalt mixture for a surface layer;(BB) Deck coating agent;(CC) SBS modified mastic asphalt mixture;(DD) Adhesive;(EE) Primer;(FF) Steel deck bridge |
