【作者】 李闯民；

【导师】 沈金安；

【作者基本信息】 东南大学 ， 道路与铁道工程， 2005， 博士

【摘要】 目前,马歇尔配合比设计方法仍是我国沥青混合料配合比设计方法。最佳沥青用量是配合比设计的精髓。本文重点研究了影响确定最佳沥青用量的重要因素沥青混合料体积参数和多种方法确定的最佳沥青用量间的关系。方差析因分析表明:表干法和蜡封法的毛体积相对密度在统计学意义上有显著差异;吸水率与混合料类型、空隙率与混合料类型对混合料的密度差有显著的交互作用,仅考虑单一因素不能完整全面地评估表干法的适应性。两种方法的变异性没有显著差异。比较研究了混合料级配类型、吸水率、空隙率对表干法和蜡封法的标准差的影响规律。对包括美国和我国在内的4种沥青混合料试件体积参数的计算方法进行了对比研究,分析发现,我国现行试验规程方法计算的VMA偏大,VV偏小、VFA偏大,计算的体积参数,经常出现矛盾。建议采用美国有效沥青用量计算体积参数的方法。击实次数试验表明:马歇尔击实次数由75次增加到100次,对最佳沥青用量的影响约为0.2%～0.3%,它的影响与同样为75次击实却采用不同的马歇尔指标标准差不多。提出了调整的体积参数范围,仍保持击实次数为75次,以减小设计沥青用量。研究了改性沥青混合料、SMA混合料和普通沥青混合料的最大理论相对密度的实测法和计算法的精度。建议改性沥青混合料最大理论相对密度采用计算法,普通沥青混合料最大理论相对密度采用真空实测法。T检验表明,马歇尔和Superpave方法确定的最佳沥青用量有显著差异,马歇尔方法确定的最佳沥青用量大。多元方差分析表明,矿料级配类型是造成两种方法确定的沥青用量不同的主要因素,其他因素对沥青用量影响不显著。更多还原

【Abstract】 Marshall method of mix design is still the design method of asphalt mix in China currently .The optimum asphalt content (OAC) is the essence of proportion design of asphalt mixture. The testing and computation method of volumetric property mainly influencing factors on the OAC of asphalt mixture and the relationship among different methods determining the OAC are studied by experimental statistics method.Test statistics results show,no statistically significance difference in testing variability was observed between results of SSD method and paraffined method and that statistically significance difference in testing bulk density is observed between two methods .The water absorption and mixture type interaction, the air voids and mixture types interactions are significant, therefore the single factor can not evaluate the adaptability of SSD method reliably.The accuracy of the theoretical maximum specific gravity of polymer modified asphalt mixture by vacuum test method and by computation method are studied. Vacuum test method does not hold good for measuring theoretical maximum specific gravity of polymer modified asphalt mixture and SMA . The theoretical maximum specific gravity should be gained by theoretical computation methodThe 4 kinds of computation methods of volumetric property of asphalt mix are compared and analyzed. According to computation method in the specifications of our country ,the VMA and VFA are greater and air voids is smaller than that using American method.Blows tests shows,the changeable value of OAC is about 0.2%-0.3% when the blows number from 75 to 100. The changeable values are the same as that of different Marshall index .It is suggested adjusting the scope of volumetric property and keeping the hammer blows of 75.The OAC of Marshall mix design method and Superpave mix design method is statistically significance difference according to the result of T testing. The OAC of Marshall is greater than that of Superpave. The influence of aggregate gradation type on OAC differences of each mixture is significant , the influences of the other factors are very small .更多还原