【作者】 王佶；

【导师】 卢哲安； 袁海庆；

【作者基本信息】 武汉理工大学 ， 结构工程， 2007， 博士

【摘要】 沥青混凝土和水泥混凝土是目前广泛应用的两种路面材料，但在公路隧道内特殊的环境和使用条件下，其应用受到限制。橡胶轻集料混凝土(RLC)是一种具有低弹性模量、高韧性、良好工作性和优良耐久性的新型生态环保型路面材料，特别适用于高速公路隧道路面建设发展的需要，其应用前景非常广阔。本论文围绕RLC的组成、结构及性能开展了大量的实验和系统的研究工作，通过对RLC物理力学性能、耐久性和微观结构的系统研究，揭示了RLC的组成、结构与性能之间的相互影响和变化规律，并将这种新型的路面材料应用到隧道路面结构的设计中，建立了RLC复合式隧道路面结构形式(PCC—RLC)，实现了RLC制备和复合式隧道路面应用的关键技术系统集成，为促进该材料的发展应用提供了重要的参考。本文进行的主要工作和取得的重要成果有：从隧道路面结构的发展战略、经济性和技术要求三个方面，把RLC复合式隧道路面的设计水平分为三个层次进行评价，在此基础上提出RLC复合式隧道路面的设计理念，用以指导设计、制备和应用该种新材料；在设计理念的指导下，结合对RLC内各种组分之间的组成结构和关系的分析，建立了RLC的三相复合分散模型，提出了弹塑性应变能理论、界面增强理论和聚合物改性理论三个主要的RLC改性设计理论。为设计、制备该类材料提供了理论依据。以设计理念和改性设计理论为指导，系统研究了橡胶粉、轻集料、外加剂以及高分子聚合物、体积砂率等配比参数对RLC工作性能、力学性能和耐久性能的影响规律；通过显微硬度分析、偏光显微镜图像分析技术以及扫描电镜研究了水泥和辅助胶凝材料在由多孔性轻集料和弹性粒料橡胶粉构造的水化环境中的水化硬化机理，探明了RLC各组分与性能间的关系；掌握了RLC低弹模、高韧性和提高耐久性的关键技术，研制出抗压强度为15～20 MPa，抗拉强度为1～3 MPa，弹性模量为10000～15000 MPa，极限拉伸变形值为0.01～0.03，低干缩、高韧性、高耐久的RLC材料。针对隧道路面这一特殊应用环境，提出用于隧道的RLC复合式路面结构形式PCC—RLC：下部为普通水泥混凝土强化层(PCC)，上部为RLC缓冲降噪层；采用有限元数值模拟技术，研究掌握了PCC—RLC复合路面结构在车辆荷载、温度荷载作用下的应力应变分布规律，掌握了RLC路面受力特征及对路面缓冲减振等舒适性的影响，为PCC—RLC复合路面结构的设计提供力学依据。系统研究了RLC搅拌、运输、浇注、振捣和养护工艺等工程应用的关键技术，提出PCC—RLC复合路面施工的主要技术要求，建立了PCC—RLC复合路面施工质量控制技术方法，为RLC的生产和应用提供了重要的参考。更多还原

【Abstract】 Asphalt concrete and Portland cement concrete are commonly used as pavement materials nowadays. But, the use of these types of concrete in tunnels is restricted. Rubberized lightweight aggregate concrete (RLC) is a kind of new environment-friendly pavement material that has low elastic modulus, high toughness, good workability and durability. Therefore, it is very suitable for the construction of pavement in tunnels of express highways. In this thesis, a serial of experiments and systemic researches is carried out which is focused on the constituents, structure and performance of RLC. Based on the systematic study on the mechanical performance, durability and microstructure of RLC, the relation among the constituents, structure and performance of RLC and the joint effects are investigated. Considerting the practical applications, this new material is applied in the design of tunnel pavement and a composite tunnel pavement structure (PCC—RLC) is put forward. Key techniques for the preparation of RLC and its applications in composite tunnel pavement are addressed, which can be used to guide the development and application of RLC.The main research work and achievements presented in this thesis are outlined as following:From the aspects of development strategy, economic and technical demand, the design of RLC composite tunnel pavement is divided into three levels. Based on this three-level design, a design concept for RLC composite tunnel pavement is put forward, which may guide the design, preparation and application of this new material. Based on the analysis of the relation between the constituents and structure of RLC, a distributed three-phase composite model is built; three main modified theories of interfacial strengthening, polymer modification and strain energy are applied, which are the theoretical foundations for the design and preparation of RLC.Based on the design concept and modified theories, the recipe of this type of concrete such as rubber particle size, lightweight aggregate type, additives, polymer and sand ratio is studied and effective rules about its workability, mechanical performance and durability are concluded. Based on results of the micro-hardness test, polarizing microscope image analysis and SEM images, the hardening mechanicsms of RLC are analyzed and the relation between the constituent and performance is revealed by using the microcosmic methods. Key propertyes such as low elastic modulus, high toughness and good durability are obtained. RLC with compressive strength of 15～20 MPa, tensile strength of 1～3 MPa, elastic modulus of 10000～15000 MPa and ultimate tensile deformation of 0.01～0.03 is developed. It has low shrinkage, high toughness and good durability as well.Considering the special working condition of tunnel pavement, a RLC composite tunnel pavement (PCC—RLC) structure is developed, which comprises a Portland cement concrete strengthening layer as the base (PCC) and a RLC layer as the up layer (RLC). By using finite element analysis, the distribution of stress and strain in this PCC—RLC structure under the vehicle and temperature loads are studied, which are the mechanical and theoretical foundations for the design of PCC—RLC.Key techniques such as mixing, transportation, pouring, vibration and curing, etc. for the engineering application of RLC are studied systematically. Critical techniques for the construction of PCC—RLC composite pavement are put forward in this thesis as well. Quality control methods are proposed, which may be used to guide the production and application of RLC.更多还原