适用于钢桥面铺装的橡胶环氧碎石防水粘结过渡层研究

发布时间：2018-01-07 08:11

本文关键词：适用于钢桥面铺装的橡胶环氧碎石防水粘结过渡层研究　出处：《东南大学》2015年硕士论文　论文类型：学位论文

【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。
[Abstract]:The waterproof bonding layer is a waterproof layer, the bond layer and the stress transition layer are very important in the whole steel bridge deck pavement system. At present, the safety of the interface between the pavement layers is not well understood. Cases of pavement disease caused by damage of waterproof adhesive layer have been continuously found in engineering practice. On the basis of the adhesive layer of EBCL epoxy resin macadam used in the resin asphalt composite system (ERS) pavement, this paper puts forward adding rubber powder and spreading crushed stone into the epoxy binder used. Taking into account the advantages of waterproof bond, elastic recovery and stress transition of rubber asphalt macadam seal layer, the rubber epoxy macadam (Reas) waterproof bond transition layer suitable for steel bridge deck pavement is formed. And the composition of the material optimization design, road service performance, composite pavement applicability and construction key technologies and other in-depth research. First, on the basis of the composition of raw materials technical requirements. Rotation viscosity test and direct tensile test were carried out to determine the optimum content of rubber powder was 4 and the particle size was 80 mesh. The viscosity time-temperature dependence, tensile viscoelasticity and high temperature rheological properties of epoxy binder modified by rubber powder were studied, and the viscosity time-temperature model based on double Arrhenius equation was obtained respectively. The tensile viscoelastic model based on Mooney-Rivlin equation and the main curve of complex shear modulus based on WLF equation; The results of BBR test showed that the flexibility of epoxy binder modified by rubber powder at low temperature was improved obviously. The SEM results showed that the epoxy asphalt system was endowed with more chemical crosslinking and physical entanglement after the addition of rubber powder. Secondly, drawing test and freeze-thaw cycle drawing test were carried out. The optimum pitch distribution of adhesive layer was determined to be 0.7 L / m ~ 2, and the interfacial bond property of epoxy adhesive layer modified by rubber powder was investigated. The anti-peeling coefficient of the original design is above 90.0%, and the peeling resistance of the transition layer of crushed stone shows excellent peeling resistance. In order to further evaluate the pavement service performance of REAS waterproof bond transition layer, water seepage test, bending test of thin steel plate and metal rod winding test were carried out. Thirdly, the drawing test of composite beam in different environments was carried out. The results show that the optimum distribution of gravel in transition layer is 3.0 kg 路m ~ (2), and the effect of temperature and moisture on the bonding performance of the composite interface is significant. The shear resistance of different shearing schemes, shearing angle and freeze-thaw cycles were compared. The shear strength was introduced and the ratio of freeze-thaw cycle shear strength was introduced. The shear dissipation energy was characterized as follows: the tensile strength of composite interface after rutting was only lower than that without rutting and 1.5% REAS waterproof adhesive transition layer showed good high temperature stability. The key technology of REAS waterproof bonding transition layer construction is studied, including raw material preparation, steel plate sandblasting and anti-corrosion coating, rubber powder modified epoxy binder production and sprinkler, pre-mixed gravel spread and so on. Combined with the experience of steel bridge deck pavement construction, the construction quality test and evaluation standard of REAS waterproof bond transition layer is put forward.
【学位授予单位】：东南大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U443.33

【相似文献】