混凝土桥面双层SMA铺装高温性能研究

摘要

At present the asphalt layer paved on cement concrete bridge deck adopts the same structure as the general pavement. In accordance with foreign applications, this paper lays down 5 double-layer SMA structures in different combination modes and inspects the high -temperature resistant deformation performance of each type of mixtures via Schellenberg Binder Drain Down Test, Cantabro Test and rutting test. On this basis the paper analyzes the high-temperature resistant deformation performance of double-layer SMA structures in 5 different combination modes via APA test and rutting test, the results show that the integral capability of double-layer SMA structures resistant to deformation is mostly dependent on combination modes of structures; the integral deformation resistant capability of combination between the mixture on upper surface course with less strong deformation resistant capability and the mixture on lower surface course with strong deformation resistant capability may be superior to the combination of double-layer mixtures with strong deformation resistant capability; therefore, the combination of pavement layer structures of SMA13+SMA9. 5 or SMA9. 5+SMA13 are recommended for concrete bridge deck.%当前水泥混凝土桥面铺装沥青层一般采用与路面相同的结构。根据国外应用情况，拟定不同组合方式的5种双层SMA结构，通过谢伦堡析漏试验、肯塔堡飞散试验以及车辙试验来检验每种类型混合料的抗高温变形性能。在此基础上，通过APA试验和车辙试验分析5种不同组合方式的双层SMA结构抗高温变形性能，结果显示：双层SMA结构整体抗变形能力更大程度上依赖于结构组合方式；上面层抗变形能力稍差的混合料与下面层抗变形能力较强的混合料组合的整体抗变形能力可能优于双层抗变形能力较强的混合料组合；故推荐混凝土桥面采用SMA13+SMA9．5或SMA9．5+SMA13铺装层结构组合。