共查询到18条相似文献,搜索用时 296 毫秒
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为了对比Superpave和马歇尔方法所设计的沥青混合料在体积参数、高温稳定性、低温抗裂性和水稳定性等方面的差异,以AC-20沥青混合料为研究对象,以高模量橡胶沥青为胶结料,设计满足工程级配范围和避开Superpave限制区的粗、中、细三个级配。结果发现:Superpave设计方法比马歇尔设计方法可减少0.3%左右的沥青用量;Superpave方法设计的沥青混合料毛体积相对密度比马歇尔方法设计的沥青混合料略大;Superpave方法设计的沥青混合料在高温稳定性和低温抗裂性方面优于马歇尔方法设计的沥青混合料,级配越粗,高温稳定性优异性越大、低温抗裂性优异性越小;Superpave方法和马歇尔方法设计的沥青混合料在水稳定性方面差别不大。 相似文献
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通过普通沥青混合料(AC),SMA和Superpave三种沥青混合料的马歇尔试验,分析了马歇尔密度和稳定度随沥青用量的变化规律,试验结果表明传统的马歇尔设计方法仅适用于连续级配悬浮密实型沥青混合料;SMA可以采用马歇尔法设计,但必须配合其他方法进行验证Superpave混合料则不宜用马歇尔方法进行设计. 相似文献
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通过Superpave沥青路面工程的实践,介绍了Superpave混合料的设计中材料选择、集料结构选取、设计级配、沥青用量确定、混合料水敏感性评价等内容。介绍了几个Superpave沥青路面工程的设计结果以及跟踪性能观测资料。说明Superpave沥青路面具有优良的高温稳定性、较好的路面均匀性及路面服务性能;Superpave混合料设计体系是个相对科学合理的沥青混合料设计体系。 相似文献
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通过试验研究,系统分析了Superpave和SMA沥青混合料的路用性能,包括原材料性能,级配分析,混合料马歇尔稳定度,水稳定性,低温抗裂性,高温稳定度,疲劳耐久性和抗滑性能,并与密级配沥青混凝土进行了对比分析。 相似文献
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以抗车辙能力作为中面层配合比设计评价的关键,按照体积嵌挤的原则对沥青混凝土路面的中面层采用多级嵌挤方法进行设计,在体积分析中考虑沥青胶浆体积的影响,最后采用贝雷法参数进行评价。 相似文献
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采用贝雷法设计了SMA沥青混合料级配,并针对SMA"三多一少"的特点,修正了贝雷法中确定填料百分率的方法,进行混合料整体级配设计,经贝雷法设计的SMA混合料级配曲线与现行规范规定的级配范围进行对比,表明对于SMA,采用贝雷设计法与马歇尔体积设计是有差异的。 相似文献
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通过Bailey,Superpave和马歇尔三种方法设计级配,选用六种沥青含量进行了车辙试验,研究了沥青膜厚与车辙动稳定度之间的关系,提出了基于高温性能的密级配沥青混合料沥青膜厚的建议. 相似文献
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分析了沥青路面中、下面层常用的4种沥青混合料类型的级配组成特点,在室内试验研究的基础上,评价了4种沥青混合料的抗车辙能力和抗水损害能力等路用性能,并分析其施工特性,得出了相关结论。 相似文献
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Aggregate packing directly affects the way of aggregate particles forming a skeleton to transmit and distribute traffic loads, thus influencing the stability and mechanical performance of the mixtures. Although some efforts have been conducted to evaluate the quality of a designed aggregate structure, such as the Bailey’s method for hot mix asphalt (HMA) mixture, there is a lack of fundamental understanding of the aggregate packing properties. Also how the packing and degree of aggregate interlock can be related to mixture performance is not clear. Major reason is because the aggregate structure is a very complicated system whose packing characteristics can be affected by both particle size distributions and the particle shape (angularities) distribution. To understand this complex packing system, our study developed a two-step procedure. As the first step, the size distribution effect is evaluated and the results are presented in this paper. The second step will investigate the combined effect of size distribution and shape impact and the results will be presented in a later paper. Specifically, in this paper we conducted a particle packing analysis using a discrete element modeling (DEM) simulation method. An HMA mixture gradation typically used in the State of Washington was utilized as a case study example for the analysis. By correlating the gradation parameter to the volumetric properties of the structure, this paper theoretically demonstrated the roles of aggregate particles with different sizes in an HMA mixture. Contact force chains and mean contact force were calculated using PFC3D DEM simulation, which provided an indication of the capability of the aggregate structure to transmit stresses through aggregate skeleton, and thereby, to resist permanent deformation. The study conducted here demonstrated the aggregate size distribution played a significant role in the packing characteristics, affecting both volumetrics and the contact characteristics of a packed structure. Such findings are critical for evaluating the combined effect of size and shape distribution on packing, and achieving a performance based aggregate gradation design. 相似文献