【作者】 孙健；

【导师】 钱振东；

【作者基本信息】 东南大学 ， 道路与铁道工程， 2015， 硕士

【摘要】 防水粘结层兼作防水层、粘结层和应力过渡层,在整个钢桥面铺装体系中至关重要。目前对铺装层间界面安全认识不足,由防水粘结层损坏导致的铺装病害案例在工程实践中不断被发现。鉴于此,本文在树脂沥青组合体系(ERS)铺装结构所用EBCL环氧树脂碎石粘结层基础上,提出在所用环氧粘结料中掺入胶粉并撒布碎石,兼顾橡胶沥青碎石封层防水粘结、弹性恢复及应力过渡的优点,形成适用于钢桥面铺装的橡胶环氧碎石(REAS)防水粘结过渡层,并对其组成材料优化设计、路用服役性能、复合铺装适用性及施工关键技术等展开深入研究。首先,在提出组成原材料技术指标要求基础上,进行旋转粘度试验和直接拉伸试验,确定最佳胶粉掺量为4%,粒度为80目；对胶粉改性环氧粘结料的粘度时温依赖性、拉伸粘弹性能和高温流变特性进行研究,分别得到基于双Arrhenius方程的粘度时温模型、基于Mooney-Rivlin方程的拉伸粘弹模型和基于WLF方程的复数剪切模量主曲线；BBR试验结果表明,胶粉改性环氧粘结料低温柔韧性得到明显改善；电镜扫描(SEM)结果表明掺加胶粉后,赋予环氧沥青体系更多化学交联和物理缠结。其次,进行拉拔试验和冻融循环拉拔试验,确定粘结层最佳沥青撒布量为0.7L/m2,考察胶粉改性环氧粘结层界面粘结性能；独创设计抗剥离试验,得到抗剥离系数均在90.0%以上,碎石过渡层表现出优异的抗剥离性能；进行渗水试验、薄钢板弯曲试验和金属棒缠绕试验等,进一步评价REAS防水粘结过渡层的路用服役性能。再次,开展不同环境复合梁拉拔试验,结果表明碎石过渡层最佳碎石撒布量为3.0kg/m2,温度和湿热作用对复合界面粘结性能影响显著；比较不同剪切方案、剪切角度和冻融循环次数的复合铺装层间抗剪性,引入抗剪强度、冻融循环抗剪强度比、剪切耗散能等指标加以表征：车辙作用后复合界面拉拔强度较未车辙仅降低1.5%,REAS防水粘结过渡层表现出良好的高温稳定性。最后,对REAS防水粘结过渡层施工关键技术进行研究,包括原材料准备、钢板喷砂除锈及防腐涂装、胶粉改性环氧粘结料生产及洒布、预拌碎石撒布等,并结合已有钢桥面铺装施工指导经验,提出REAS防水粘结过渡层施工质量验评标准。更多还原

【Abstract】 Waterproof cohesive layer plays an important role in steel deck pavement with the function of stress absorbing. However, due to the lack of recognition of interface security, disease cases of deck pavement have been constantly found in engineering. In view of these, rubber-epoxy-stone waterproof cohesive transition layer (REAS layer for short) was brought up based on EBCL of ERS steel deck pavement technology. In addition, rubber asphalt macadam seal technology was also introduced for the advantage of elasticity restoring and stress reduction. Choosing REAS layer as research object, some key performance including material optimization design, road service performance, composite pavement structure and construction technology were discussed in this paper.Firstly, based on proposing technical indicators of raw materials, revolving viscosity test and direct tensile test were done to determine the best adding ratio and particle size of rubber powder. Then, revolving viscosity test, tensile creep test and dynamic shear test were carried out to evaluate the performance of rubber modified epoxy bond. Meanwhile, viscosity time-temperature dependency model based on dual Arrhenius equation, tensile creep model based on Mooney-Rivlin equation and master curve of plural shear modulus based on WLF equation were established. BBR test results showed that addition rubber improved low temperature flexibility of REAS layer. SEM images showed more chemical crosslinking and physical tangles were formed in epoxy asphalt system after adding rubber.Secondly, pull-out test and freeze-thaw pull-out test were done to evaluate the interface bonding performance of REAS layer with the best asphalt spraying quantity of 0.7L/m2. Stripping test specially designed was carried out and anti-stripping coefficient was over 90.0%, showing better anti-stripping performance of REAS layer. Besides, water penetration test, thin plate bending test and metal coil test were done to evaluate other road service performance of REAS layer.In addition, composite beam pull-out test under the best gravel spraying quantity of 3.0kg/m2 was carried out. Test results showed that temperature and immersion had significant effects on interface bonding performance. Contrast shear test with different shear structures, different shear angles and different freeze-thaw cycles was done to evaluate the shear resistance of REAS layer. Meanwhile, the tensile strength only declined by 1.5% after rutting test, showing better high temperature stability of REAS layer.Finally, the key technology of construction for REAS layer was studied, including raw materials preparation, steel sandblasting, anti-corrosive coating, bond and gravel spraying, etc. Then, the evaluation standard of construction quality for REAS layer was put forward based on the construction guidance experience of steel deck pavement.更多还原