4.75 mm NMAS Stone Matrix Asphalt (SMA) Mixtures
4.75 mm NMAS Stone Matrix Asphalt (SMA) Mixtures
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4.75 毫米 NMAS 石基质沥青 (SMA) 混合物
DOI：
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发表时间：
2003
期刊：
影响因子：
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通讯作者：
Hongbing Xie
中科院分区：
文献类型：
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作者：
M. Huner;L. Cooley;Hongbing Xie
使用4.75 mm标称最大集料尺寸(NMA)的热拌沥青最近已成为公路工程师更具吸引力的替代方案，因为这些混合料有可能在预防性维护计划中使用。这种吸引力的主要原因是，这些混合体可以放在薄薄的电梯里。由于4.75 mm纳米级配沥青混合料(SMA)的研究和开发经验，需要进一步完善4.75 mm级配沥青混合料的设计。具体地说，评估了通过0.075 mm筛子和当前指定的排水篮子的分数。根据试验结果和分析，有时可以成功地设计出具有4.75 mm NMA的SMA混合料，其级配通过0.075 mm筛子的集料分数低于当前规定的12%。只要满足所有其他要求，就可以使用集料分数超过9%的0.075 mm筛分的级配。使用2.36 mm开口的钢丝网篮子进行的排水试验产生的试验结果比使用6.3 mm开口的钢丝网篮子进行的试验排出的少。得出的结论是，两种篮子之间的排水结果的差异与通过不同网目大小的开口的混合量有关。
The use of 4.75 mm nominal maximum aggregate size (NMAS) hot mix asphalt has recently become a more attractive alternative to highway engineers because these mixes have the potential to be used within a preventative maintenance program. The primary reason for this attractiveness is that these mixes can be placed in thin lifts. Because of the recent research and experiences in developing 4.75 mm NMAS Stone Matrix Asphalt (SMA) mixes, a study was needed to further refine the design of 4.75 mm NMAS SMA mixes. Specifically, the fraction passing the 0.075 mm sieve and the currently specified draindown basket were evaluated. Based upon the test results and analyses, SMA mixes having a 4.75 mm NMAS can sometimes be successfully designed having gradations with aggregate fractions passing the 0.075 mm sieve less than the currently specified 12 percent. Gradations with aggregate fractions passing the 0.075 mm sieve of 9 percent can be utilized as long as all other requirements are met. Draindown tests conducted using a wire mesh basket with 2.36 mm openings produced test results with less draindown than tests conducted with a wire mesh basket having 6.3 mm openings. It was concluded that the difference in draindown results between the two basket types was related to the amount of mix that could fall through the different mesh size openings.