高速公路大修工程厂拌热再生技术的应用

依托青银高速靖边至王圈梁段路面大修工程,研究了靖王高速公路回收沥青路面材料(RAP)的性能,厂拌热再生混合料的配合比及其路用性能。结果表明:路面回收沥青的25℃针入度为43.3(0.1 mm),软化点为62.2℃,RAP具备再生条件;经筛分0~10 mmRAP掺配10%,10~20 mmRAP掺配15%,再生混合料中新沥青用量为3%时,路用性能良好,其马歇尔残留稳定度为93.43%、冻融劈裂强度比86.5%、车辙试验动稳定度(5 cm厚)为7250次/mm。且经济效益明显,节能环保。

Application of hot mix recycling technology in highway overhaul works

Relying on pavement overhaul project of Jingbian to Wangqualiang section of Qingyin Expressway,the performance of recycled asphalt pavement material(RAP)on Jingwang Expressway,the mix ratio of plant-mixed hot recycled mixture and its pavement performance were studied experimentally.The test results show that the pavement reclaimed asphalt has a penetration of 43.3(0.1 mm)at 25℃and a softening point of 62.2℃.The RAP has regeneration conditions;After sieving 0~10 mm RAP blending 10%,10~20 mm RAP blending 15%,reclaimed mixture new asphalt dosage 3%,the recycled mixture Marshall residual stability is 93.43%,freeze-thaw splitting strength ratio 86.5%,rutting test dynamic stability(5 cm thick)was 7250 times/mm.The plant mixed with hot reclaimed mixed materials has good performance and obvious economic benefits,energy saving and environmental protection.