改性沥青混合料施工温度的确定

Determination of construction temperature for modified asphalt mixture

为了研究改性沥青温度与黏度的关系,由扭矩代替黏度,根据改性沥青混合料与基质沥青混合料达到相同的扭矩,确定改性沥青的拌和与压实温度.将确定好的改性沥青施工温度代入黏温曲线中,即可得到适合于改性沥青的拌和与压实黏度.推荐的改性沥青合理的拌和与压实黏度分别为(0.32±0.03)Pa·s和(0.45±0.05)Pa·s.对结果进行验证,改性沥青混合料试件毛体积密度最大值对应的拌和温度与和易性试验确定的改性沥青拌和温度相近.在和易性试验确定的改性沥青施工温度下成型试件,对成型好的试件进行高温、低温和水稳定性能检测,检测结果均满足JTG F40—2004《公路沥青路面施工技术规范》要求.

To investigate the relationship between temperature and viscosity of modified asphalt,using torque to substitute viscosity,the modified asphalt mixing and compaction temperatures were determined with torque of modified asphalt mixture equal to that of matrix asphalt mixture. The temperature of modified asphalt was substituted into viscosity-temperature curve to obtain mixing and compacting viscosities. The reasonable modified asphalt mixing and compacting viscosities were( 0. 32 ± 0. 03) Pa·s and( 0. 45 ± 0. 05) Pa·s,respectively. The results show that the mixing temperature corresponding to the maximum bulk density of modified asphalt mixture is similar to that from workability test. The specimens were prepared under the construction temperature from workability test. High temperature,low temperature and water stability tests show that the results meet the requirement of the technical code for construction and acceptance of highway asphalt pavement( JTG F40—2004).