水泥混凝土路面蜡制隔离层作用机理及设计方法研究

The isolation layer made of emulsion wax curing agent (EWCA) is a new structure of cement concrete pavement (CCP) and EWCA is a new material for isolation layer of CCP. An EWCA isolation layer plays not only isolation function, but also antifriction, waterproof, etc. At a low cost and with easy construction, an EWCA isolation layer can break bonding between a surface layer and a base layer, and reduce the occurrence of weak transition layer (shortened as the “transition layer” hereinafter) under the bottom surface of surface slab during construction. But the current researches on EWCA isolation layer still focus on the qualitative analyses.. This project firstly is to explore the “transition layer” structures (including the macro, meso and micro structures) of CCP with EWCA isolation layer and the penetration of EWCA with the help of electron microscopes, mercury porosimeters, etc. Furthermore, by means of the tests for texture depth of the base slab surface, the tests for permeability, the tests for anti-erosion, the tests for bonding between the surface slabs and the bases, and the tests for friction coefficient, this project is to analyze the mechanism of EWCA isolation layer functions as isolation, antifriction and waterproof. And then this project is to establish the model of effects of texture depth of the base slab surface and EWCA materials on the isolation function, and the Coulomb model of the interlayer bonding and friction. Moreover, this project is to explore the effects of construction factors on the functions of EWCA isolation layers, to reveal the mechanism of various functions played by the EWCA isolation layers, to put forward the design of the isolation layers and the base slabs of CCP based on the mechanism of various functions played by the EWCA isolation layers, with the purpose to improve the service life of the pavements.

蜡制隔离层是一种水泥混凝土路面隔离层新材料、新结构，具有隔离、减摩、防水等功能，可降低面层与基层的结合程度，减弱混凝土面层下表层在施工中产生的薄弱过渡层（简称“过渡层”）的形成，且造价经济、施工简便，但其作用机理与设计方法研究目前尚停留在“定性”层面，且未广泛推广应用。.本项目拟借助电子显微镜、压汞测孔仪等开展设置蜡制隔离层路面板“过渡层”结构（宏观、细观与微观结构）及蜡制隔离剂渗透情况的研究，并进一步通过基层表面构造深度试验、渗水试验、抗冲刷试验和层间粘结力及摩擦系数室内外等试验，全面深入分析研究蜡制隔离层在隔离、减摩、防水等方面的作用机理，建立基层构造深度与蜡制剂材料对隔离性能的影响模型，建立层间粘结力与摩阻力的库仑模型等，揭示水泥混凝土路面蜡制隔离层作用机理，提出蜡制隔离剂材料标准与蜡制隔离层路面设计方法，提高路面使用寿命。

蜡制养护剂隔离层是一种水泥混凝土路面隔离层新材料、新结构。水泥混凝土路面蜡制隔离封层具有隔离、减摩、防水等功能，可降低面层与基层的结合程度，减弱混凝土面层下表层在施工过程中产生的薄弱过渡层（简称“过渡层”）的形成。.本项目借助电子显微镜、核磁共振分析仪等开展了设置蜡制隔离层混凝土路面板“过渡层”结构（宏观、细观与微观结构）及蜡制隔离剂渗透情况的研究，并进一步通过基层表面构造深度试验、渗水试验、抗冲刷试验和层间粘结力及摩擦系数试验，分析研究了蜡制隔离层在隔离、减摩、防水等方面的作用机理。测试了蜡制隔离层对水泥混凝土面板过渡层的微观结构的影响、不同条件下蜡制隔离剂成膜与隔离性能，通过建立路面结构有限元模型对水泥混凝土路面的结构荷载应力进行研究，并提出路面设计结构方案及蜡制隔离剂最佳用量，获得了基层构造深度与蜡制隔离剂材料对隔离性能的影响规律，提出了基于蜡制隔离层作用机理及功能要求的水泥混凝土路面隔离层及基层设计方法，提高了路面使用寿命。广东、湖南实体工程应用表明：喷洒蜡制隔离剂后可改善过渡层混凝土孔隙结构，大幅度降低半刚性基层混凝土路面的层间粘结力和综合摩擦系数，使混凝土路面板过渡层更加密实，提高了水泥混凝土路面的承载能力；相较于其他种类的隔离层，蜡制养护剂隔离层的成本更低，具有良好的经济效益。