厂拌热再生混合料拌和工艺优化研究

Optimization Research for Mixing Method of Central Plant Hot Recycling Mixture

针对厂拌热再生混合料常规拌和工艺存在的缺陷提出改进,通过沥青混合料冻融劈裂试验、车辙试验和低温弯曲试验等分析了不同拌和工艺对厂拌热再生混合料体积参数、水稳定性、高温稳定性和低温抗裂性的影响。结果表明,对于较高旧料掺量的厂拌热再生混合料,采用改进拌和工艺能够显著提高其压实性能、水稳定性、高温稳定性和低温抗裂性。

Against defects of normal mixing method, an improved mixing method for central plant hot recycling mixture is proposed. Based on freeze-thaw splitting test, wheel rutting test and low-temper-ature bending tes t, the impact on volumetric property, moisture susceptibility, thermal stability and crack resistance of central plant hot recycling mixture between normal mixing method and improved mixing method are analyzed. Research indicates th a t, for the high RAP percentage central plant hot recycling mixture, using improved mixing method can significantly increase the compactibility, mois-ture susceptibility, thermal stability and crack resistance.