【作者】 何俊辉；

【导师】 申爱琴；

【作者基本信息】 长安大学 ， 材料学， 2009， 硕士

【摘要】 材料的微观结构决定着宏观性能,道路混凝土也不例外,不同尺度的内部孔结构直接影响到宏观耐久性,进而影响到水泥路面的使用寿命。因此,深入研究道路混凝土微观结构与宏观性能的相关性,对从本质上认识道路混凝土的工作性状及规律、指导组成设计具有重要的意义。本文分别选取了不同尺度层次上典型的气孔结构、孔结构及微观形貌作为研究对象,全面系统地分析了三者与各项宏观路用性能之间的关系,总结归纳了材料组成对微观结构的影响规律,进而推荐了基于微观结构的配比设计参数的合理取值范围。在理论分析的基础之上,自行开发了基于数字图像处理技术的测孔方法,首次引入了气孔结构的总气孔率、平均孔径等指标,建立了气孔测试及评价体系,该体系比传统气孔测试方法更简便、快捷、精确度高。同时,首次跨越不同结构层次、全面系统地分析研究了道路混凝土不同尺度的微观孔结构的变化规律及对路用性能的影响,并推荐了满足不同耐久性分区的氯离子抗渗性、抗冻性要求的合理气孔参数及孔级配范围。本研究成果具有理论明确、系统完整、先进实用性等特点,对水泥混凝土路面的设计与检验具有重要的指导作用。更多还原

【Abstract】 There is no exception to Road cement, the microstructure of material decides its macroscopic performance, and the internal structure of different dimension directly influences the macroscopic durability. Therefore, a deep research in the relevance of road concrete’s microstructure and macroscopic performance has the vital significance to essentially recognize the workability and rule of the cement and to instruct the composition design.This paper chooses typical stomata structure、pore structure and micro-morphology of different scale level as the research object, comprehensively analyzed the relation between the three and every macroscopic pavement performance, summarized the rule of the influence of material composition on microstructure, then recommended the rational value rang based on the proportion design parameters of microstructure. Based on theory analysis, the measuring hole method based on digital image processing technology was self-developed. The indexes of total porosity、average pore diameter of pore structure was firstly introduced. The system of stomata test and evaluation which is easier、swifter、accuracy-higher was established.At the same time, crossing the different structure level, this study comprehensively analyzed the influence of the change law of the road concrete’s microstructure of different dimension. It also recommended the rational stomata parameters and the stomata gradation rang which can meet the demand of chloride impermeability、frost resistance of different durability division. This study result has the character such as theory clear、theory complete、practicality advanced etc, it plays a guiding role in the design and test of cement concrete pavement.更多还原