【作者】 孙增智；

【导师】 申爱琴；

【作者基本信息】 长安大学 ， 道路与铁道工程， 2010， 博士

【摘要】 水泥混凝土路面因强度高、水泥来源广而得到广泛应用,然而,在当前重载交通和自然环境因素作用下,水泥路面耐久性病害日益严重,耐久性问题己成为混凝土界最为关注的焦点。耐久性设计成了道路混凝土组成设计体系中最为关键的组成部分,但已有的设计方法难以表征我国水泥路面真实的耐久性工作状态,导致水泥路面因耐久性损坏而产生惊人的维修费用。针对这种现状,本文以国家西部交通建设科技项目《道路水泥混凝土组成设计研究》为依托,借鉴国内外先进理念,对道路混凝土的耐久性设计进行了深入而系统的研究。论文首先全面分析了国内外道路混凝土耐久性设计的研究现状,认为水泥路面耐久性病害及其破坏机理是一个非常复杂的问题,是多种因素综合作用的结果,它不仅涉及到原材料、配比组成设计及施工,还与交通荷载、气候分区、温度应力及腐蚀性介质等有关。论文在分析道路混凝土内部结构状态和材料组成关系的基础上,设计了科学合理的研究方案,优选出了能够反映道路混凝土实际耐久性破坏状态的评价指标和测试方法.通过大量实验与理论分析,研究了道路混凝土的材料组成参数和氯离子抗渗性、抗盐冻性和抗滑性之间的关系,建立了各类耐久性设计模型；提出了耐久性气候分区和交通荷载分级的概念与分类；通过分析不同的耐久性能对材料设计要求的共性和差异,借鉴参考大量国内外先进经验,提出了不同耐久性分区下道路混凝土水灰比、用水量、水泥用量、含气量、砂浆体积分量、粗集料公称最大粒径NMPS等参数的合理取值范围；分析了道路混凝土的耐久性损伤和性能衰减模式,探究材料设计优化对耐久性的改善机理；为探索更为简单快捷的耐久性检验方法,还发掘了与抗冻性、耐磨性等耐久性关联性较好且更为易测的路用性能指标,并建议了相关标准。论文推荐了不同耐久性气候分区和荷载分级条件下,基于氯离子抗渗性设计、抗盐冻设计及耐磨性设计的道路混凝土材料组成参数的合理取值范围,并建立了氯离子抗渗性设计模型、抗盐冻设计模型及耐磨性设计模型；提出了基于体积设计理念的道路混凝土耐久性设计、验证和调整的流程与步骤,并结合实体工程验证了道路混凝土耐久性设计方法的可操作性和实用性。更多还原

【Abstract】 Because of the high strength of cement concrete pavement and the extensive source of cement, the cement concrete pavement has been widely used, however, by the action of the contemporary heavy-load traffic and the natural environment factors, the durability diseases of cement concrete road is serious increasingly, durability of concrete has already become the focus in the concrete field. Durability design is the most important key part of road concrete mix design system, but the existing design methods is difficult to represent the characterization of the real durability working condition of our country’s road concrete, and causing startling cost of maintenance due to durability diseases of cement concrete road. Aiming at the present situation, this paper relies on the Item of Communications Construction Science and Technology in West China "The Study on Design of Road Concrete Mix Proportion", based on the advanced concepts both home and abroad, the design method of road concrete mix proportion is researched thoroughly and systematically.The author in this paper comprehensively investigated and analyzed the domestic and international research conditions of road concrete at first, and thought that the durability diseases of cement concrete road and the pavement damage mechanism is a complicated problem which is the result of many factors comprehensive influence. It relate to not only the raw materials, the design of road concrete mix proportion and construction, but also the traffic load, the partition of climate environment, temperature stress and the corrosive medium.On the basis of the analysis relationship between road concrete’s state of the internal structure and the material composition, the author designed a scientific and rational research scheme, and optimized the evaluation and testing methods which can reflect the actual durability damage state of road concrete. The relation between the material mix parameters and the impermeability of chloride, the frost and salt resistance, the abrasive resistance and the anti-slip performance of road concrete is also studied systematically by many tests and theoretical analysis, and the various design models of durability is established; Through analyzing the common and difference among durability design requirements which is caused by the different materials, consulting the large number of domestic and international advanced experience, the traffic load classification and durability partition of climate environment is put forward; The reasonable range of road concrete mix parameters under different durability partition such as water-cement ratio, the amount of water consumption and cement consumption, air content, mortar volume component and NMPS, etc. is proposed; The permanent damage and performance degradation model of road concrete is analyzed, and the mechanism of durability improvement which is caused by material design optimization is explored; In order to find a more simple, shortcut testing method, the evaluation indicators of the pavement performance about durability which is easily detected such as frost resistance, wearability was found, and the relative standards is suggested.This paper recommends for the first time the reasonable range of road concrete mix parameters under different climatic regionalization and load classification, based on the design of impermeability of chloride, the frost and salt resistance, and the abrasive resistance; Using as basis for the volume design concept, the durability design method, verification and adjustment of the processes and procedures is first presented, and the maneuverability and practicality of concrete durability design is verified by combining the actual project.更多还原