当代化工

以郑州市某国省道干线公路大修工程为例，通过混合热再生技术的研究与应用，总结相关技术要点，倡导该技术在公路养护中的推广应用。结果表明：为了提高检测精度，将燃烧炉法改为脂质提取法（T0724—1993），检测结果的绝对误差可控制在0.3%以内。含有再生沥青混合料（RAP）的试样比含有新团聚体的试样具有更高的模量，使用低渗透级的30号沥青黏结剂生产含RAP的高模量沥青混合料可行。旧沥青渗透度在20(0.1 mm)以下的RAP材料，可在旧沥青严重老化后加入再生剂进行改性，但再生沥青仍然勉强满足要求，混合沥青渗透度可保持在70(1/10mm)，马歇尔指数与新材料基本相同。不含再生剂的RAP混合料虽然马歇尔稳定性有所提高，但冻融劈裂强度大大降低，水稳定性过低，不适合用作高等级公路的路面材料。

Taking the overhaul project of a national and provincial trunk highway in Zhengzhou as an example,through the research and application of mixed heat regeneration technology, the relevant technical points were summarized, and the popularization and application of this technology in highway maintenance were advocated. The results showed that in order to improve the detection accuracy, the combustion furnace method was changed to lipid extraction method(T0724—1993), and the absolute error of the detection results was controlled within 0.3%. The samples containing recycled asphalt mixture(RAP) had higher modulus than the samples containing new aggregates.It was feasible to produce high modulus asphalt mixture containing RAP with low permeability grade No.30 asphalt binder. RAP materials with old asphalt permeability below 20(0.1 mm) could be modified by adding regenerant after serious aging of old asphalt, but the recycled asphalt still barely met the requirements. The permeability of mixed asphalt could be maintained at 70(1/10 mm), and the Marshall index was basically the same as that of new materials.Although the Marshall stability of RAP mixture without regenerant was improved, the freeze-thaw splitting strength was greatly reduced and the water stability was too low, so it was not suitable to be used as pavement material of high-grade highway.