【作者】 徐慧宁；

【导师】 谭忆秋；

【作者基本信息】 哈尔滨工业大学 ， 道路与铁道工程， 2007， 硕士

【摘要】 实际生产过程中沥青混合料矿料级配的波动是影响沥青路面使用质量的关键因素之一。体积指标由于概念明确、试验操作简便易行,与级配联系密切,而被广泛应用于实际工程质量控制中。本文以体积指标为基础,进行了如下四方面的研究:首先,分析了采用沥青混合料体积指标表征级配变化的合理性,确定以空隙率作为反映级配变化的关键指标。研究显示,级配因素是引起沥青混合料体积指标变化的主导因素,毛体积相对密度、空隙率、矿料间隙率、沥青饱和度、有效沥青的体积百分率及矿料的体积百分率等体积指标对于级配的变化是敏感的,且相互具有一定的相关关系;当级配变化相同幅度时,空隙率的变化最为明显。在上述研究的基础上选择空隙率作为研究对象,并以空隙率的变化率作为评价级配变化程度的指标。在此基础上,探讨了级配波动时,沥青混合料空隙率的变化规律和变化幅度。试验结果显示,当细集料级配发生变化时,随着细集料级配由细变粗,沥青混合料的空隙率逐渐变大;当粗集料发生变化时,粗集料采用中间级配,空隙率最小,采用上限级配时,空隙率最大;此外,4.75mm通过率对空隙率也有重要的影响。沥青混合料空隙率变化幅度受细集料内部结构的影响最为显著,而粗集料内部结构、4.75mm通过率对其并无显著影响。此外,研究了级配波动对沥青混合料路用性能的影响。研究表明,粗、细集料内部结构及4.75mm通过率的变化对沥青混合料的高温稳定性、水稳定性存在显著影响,而对低温抗裂性的影响较小。最后,进行了路面生产质量控制标准的研究,提出了保证沥青路面质量不发生变异的体积指标允许变化幅度,为实际应用提供了有意义的参考。更多还原

【Abstract】 In construction, the fluctuation of asphalt mixture’s gradation is one of the most important factors affecting asphalt pavement performance. Volumetric parameters are widely used in field because its physical meaning is definite and experiment method is simple. Based on volumetric parameters, this paper mainly studied on the following four topics:Firstly, we analysed the rationality of using volumetric parameters to reflect the fluctuation of gradation and selected to reflect the fluntuation. Study VVshowed that tγf, VV , VMA,VFA,V be ,Vg is sensitive to the fluctuation of gradation, is used to express the change extent of gradation. VVBased on the above research, the change law and extent of VV with the gradation fluctuation is studied. VV will increase with the fine aggregate gradation changed from coarse to fine; while the coarse aggregate is changed, is the smallest when the gradation is in the middle and is the greatest when the gradation is in the upper limit. Besides, 4.75mm percentage passing has important effect to . Fine aggregate gradation observably affect the change extent of VV , but VV is less affected by the change of coarse aggregate gradation and 4.75mm percentage passing.Besides, the influence which is carried by the change of gradation to pavement performance is studied. The results showed that the change of coarse, fine aggregates, or 4.75mm percentage passing will obviously affects high temperature stability and the moisture susceptibility, but low temperature anti-split ability is less sensitive to the change of gradation.Finally, pavement quality controlling criterion is studied, and the acceptable range of volumetric parameters is put forward to ensure the pavement performance. These results will provide significative proposition in application of construction.更多还原