温拌沥青混合料马歇尔-轮碾分步设计方法

Marshall Wheel Roller Method for The Design of Warm Mix Asphalt Mixture

采用沥青混合料轮碾成型机,等体积参数原则,研究了Evotherm温拌沥青混合料的集料加热温度、混合料最低成型温度。发现温拌沥青混合料在最低成型温度的情况下,运用马歇尔-轮碾分步设计法设计的温拌沥青混合料水稳定性及疲劳性能试验结果优于热拌沥青混合料,其它指标与热拌沥青混合料相当,再降低成型温度时,混合料的空隙率将无法满足要求。结果表明:在材料组成、成型方式相同时,通过选用热拌混合料成熟的油石比设计方法、我国普及的轮碾成型机试验设备及该设备与实际路面压实效果较为接近的优势,提出的马歇尔-轮碾分步设计法可以准确的确定温拌沥青混合料集料加热温度和混合料的成型温度,使设计的温拌沥青混合料更能体现其环保降温的特点,在我国具有高的推广价值。

By using asphalt Wheel rolling machine , with equal volume parameter as the princi-ple , the aggregate heating temperature and the mixture formation temperature threshold of the Evotherm warm mix asphalt mixture were studied. Under the condition of the lowasphalt mixture , It is found that the water stability and fatigue performance is better than that of the hot mix asphalt mixture , which were designed by Marshall wheel roller method, other indexes are equivalent to hot mix asphalt mixture. The results showed that in material composition , forming the same way , by u-sing hot mix mixture mature oilstone and the advantage of the wheel milling macment compaction efect is more close. Marshall wheel roller design method can actemperature mix asphalt mixture heating temperature and mixing material forming temperatureof warm mix asphalt mixture can better reflect the effect of the cooling of environmhigh application value in our country.